* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download IQS17 / IQS117 Family IQ Switch - ProxSense™ Series
Survey
Document related concepts
Standby power wikipedia , lookup
Schmitt trigger wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Audio power wikipedia , lookup
Immunity-aware programming wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Current mirror wikipedia , lookup
Surge protector wikipedia , lookup
Voltage regulator wikipedia , lookup
Crossbar switch wikipedia , lookup
Power MOSFET wikipedia , lookup
Power electronics wikipedia , lookup
Opto-isolator wikipedia , lookup
Transcript
IQ Switch® ProxSense™ IQS17 / IQS1171 Family IQ Switch® - ProxSense™ Series Capacitive Touch Sensor, Load Control and User Interface ProxSense offers differentiated proximity and physical contact outputs. Features • Automatic environment compensation • Multiple User Interfaces • Controls high voltage external regulators with minimum external components • Series Onboard Regulator • 50 – 60Hz supported • 2- and 3-Wire supported • Digital signal processing • Leading-edge (Forward Phase Control) dimming using Triac Control • Trailing-edge (Reverse Phase Control) dimming using FET Control • PWM load control in DC Mode ® • IQ Switch Technology • Soft-on and soft-off • Auto-off with Advanced Auto-off Warning (AAOW) • Find-In-The-Dark (FITD) • Touch/Switch interface • Rheostat dimming supported • Different touch and proximity sensitivity settings • CFL load compatibility IQS117 IC – 20 pin SSOP Applications • Domestic/Corporate wall switches • Appliance controls • Desk lamps • Other fixed or semi-fixed lighting applications • Proximity Sensors ProxSense™ is a fully integrated capacitive sensor, user interface and load controller. The IC may be used in a variety of consumer lighting applications, varying from domestic wall switches to desk lamps, as well as domestic appliances. The integrated design minimises external components while taking care of a number of essential and comfort features. The IC is a stand-alone device, capable of controlling a triac or transistor to power the load. The device can be powered from high voltages using minimal external components. This is made possible by the onboard regulator control. The device also features an internal regulator, ensuring a stable operating voltage. These features greatly reduce the cost of systems employing the IQS117. Through unique patented technology a number of additional functions are offered over and above the traditional on/off operation of electro-mechanical switches. ProxSense™ is capable of detecting a differentiated touch or proximity condition through almost any dielectric. 1 New Name: IQS117 Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 1 of 50 February 2008 IQ Switch® ProxSense™ Contents 1 2 3 4 Overview .............................................................................................................................. 3 Pin Descriptions ................................................................................................................... 4 Typical Connection Diagram ................................................................................................. 5 Capacitive Sensing ............................................................................................................... 6 4.1 Sense Plate Capacitance ................................................................................................................. 6 4.2 The Charge Transfer principle .......................................................................................................... 6 4.3 Designing the Capacitive Sensing Circuit ......................................................................................... 7 4.3.1 Oscillator (Transfer Rate) ........................................................................................................ 7 4.3.2 Cs Capacitors.......................................................................................................................... 8 4.3.3 Determining a Proximity/Touch ..............................................................................................10 5 Regulator Design ............................................................................................................... 11 5.1 5.2 5.3 5.4 5.5 5.6 6 2 Wire/ 3 Wire Operation .................................................................................................................11 LED..................................................................................................................................................11 External Boost- and Series Regulator – Proposed Leading-edge 2 Wire Design ............................13 Internal Shunt Regulator – Proposed Leading-edge 3 Wire Design ................................................15 External Boost- and Series Regulator – Proposed Trailing-edge 2 Wire Design .............................16 Internal Shunt Regulator – Proposed Trailing-edge 3 Wire Design .................................................17 Load Control ...................................................................................................................... 18 6.1 Trailing-edge or Leading-edge .........................................................................................................18 6.2 AC or DC Mode ...............................................................................................................................18 6.3 Triac Control ....................................................................................................................................18 6.3.1 EMC Filter ..............................................................................................................................19 6.3.2 Incandescent / CFL Load .......................................................................................................19 6.4 MOSFET and IGBT Control .............................................................................................................20 6.4.1 EMC Filter ..............................................................................................................................21 6.4.2 Incandescent / CFL Load .......................................................................................................21 6.5 DC Loads.........................................................................................................................................21 6.6 Desensitising the System ................................................................................................................21 7 Special Features ................................................................................................................ 22 7.1 7.2 7.3 8 Rheostat ..........................................................................................................................................22 ESD Protection ................................................................................................................................23 Switch ..............................................................................................................................................23 User Interface (UI) .............................................................................................................. 24 8.1.1 Actuation Type .......................................................................................................................26 8.1.2 Find-in-the-Dark (FITD) ..........................................................................................................26 8.2 User Interface Algorithm ..................................................................................................................26 8.2.1 Mode Stepping .......................................................................................................................26 8.2.2 Single Mode ...........................................................................................................................29 8.2.3 Memory Mode ........................................................................................................................31 8.2.4 Hard on/off mode ...................................................................................................................33 8.2.5 Momentary Output .................................................................................................................34 8.3 User Interface Enhancements .........................................................................................................35 8.3.1 Continuous Dimming Mode ....................................................................................................35 8.3.2 CFL Mode ..............................................................................................................................37 8.3.3 Rheostat dimming ..................................................................................................................38 8.3.4 Auto-off with AAOW ...............................................................................................................38 8.4 Typical Applications .........................................................................................................................40 8.4.1 Desk Lamp .............................................................................................................................40 8.4.2 Wall Switch.............................................................................................................................40 8.4.3 Appliance Control ...................................................................................................................40 9 Schematics ........................................................................................................................ 41 10 Device Specifications .................................................................................................... 44 10.1 10.2 10.3 10.4 10.5 10.6 Absolute Maximum Specifications ..............................................................................................44 Operating Conditions ..................................................................................................................44 Timing Characteristics ................................................................................................................45 Defined Power Levels (For Resistive Loads) ..............................................................................46 Device Designator.......................................................................................................................47 Packaging Information ................................................................................................................48 Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 2 of 50 February 2008 IQ Switch® ProxSense™ 1 Overview ® The ProxSense™ IQS117 is based on Azoteq’s patented IQ Switch technology, which has been tried and tested in the consumer lighting market. In addition to the unique User Interfaces (UIs) available, actuation is now possible through touch or proximity of a sense plate. Reliable and trouble-free operation is achieved by advanced features, ensuring robustness of the product. The IC is designed to operate under AC and DC conditions. Depending on the supply conditions, the device is capable of controlling both AC and DC loads, using inexpensive external circuitry. The IQS117 eliminates the need for a microprocessor to control the load, greatly reducing the system costs. The IQS117 can be used with any incandescent or halogen load. CFL's are also supported, but due to their physics they are not dimmable. The IQS117 features advanced regulator control, allowing the device to be powered from high voltages using minimal external circuitry. The device can control an external boost-, serial- and/or shunt regulator. This eliminates the need for expensive external regulators. The device also features an internal regulator that generates a stable operating voltage. A number of user interface (UI) options are available, presenting the user with unique ways of dimming the load. These include using fixed preset levels, a touch-and-hold dimming scheme, or storing a preferred dimming level in memory. The device helps the user in detecting the switch position in the dark, either by lighting the main load at a certain dimming level, or using a backlight. A dimming level can be selected using a touch interface with a sense plate, pressing a low voltage electromechanical switch, or using a rheostat. Please refer to page 50 for a list of applicable patents. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 3 of 50 February 2008 IQ Switch® ProxSense™ 2 Pin Descriptions Pin Name Type Function 1 TEST Digital Input Reserved for IC testing (Do not connect) 2 ZC Analog Input Zero Cross Detection 3 VSW Analog Input Load Selector 4 TG Output Triac/ MOSFET/ IGBT gate signal (AC) / PWM signal (DC) 5 LED Analog Output LED Drive Signal 6 VSS Ground GND reference 7 VDD Analog Output Internal Regulator Output (Connect 100nF Capacitor to VSS) 8 HVSENSE Analog Input Boost Regulator Voltage Sense 9 SHNT Output Open Drain NMOS. Shunt/Serial Regulator Control 10 VDDHI Supply Input Supply Voltage Input 11 PWRCNTR Output Boost Regulator Control 12 TRPSEL Input Proximity Sensitivity Selection 13 NC No Internal Connection - 14 CX Analog I/O Sense Plate 15 CS Analog I/O Capacitive Sensing Charge Collection 16 NC No Internal Connection - 17 SW Digital Input Active High Switch Input, 10kΩ internal pull-down 18 REOIN Analog Input Rheostat Input. Touch Sensitivity Selection 19 REOCNTR Input Output 2 / 3 Wire Selection Rheostat FET Control 20 OSC Custom OSC frequency adjust. Resistor to VDD Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 4 of 50 February 2008 IQ Switch® ProxSense™ Typical Connection Diagram IQS117 EXTERNAL REGULATOR COMPONENTS CONTROLLED BY IQS117 VDD SHNT HVSENSE PWRCNTR C3 CS 100nF CS RX 1M R10 VDDHI GND CX R12 SENSE PLATE 1M ZC GND 1M C10 R35 GND R36 VSW 1 10k R15 LOAD 3 CFL LOAD ENABLE/DISABLE PROXIMITY SENSITIVITY SETTING TRPSEL 1M GND 10k 100pF R11 GND GND A1 D1 OSC 1 SW GND 3 R39 C25 100nF G R25 2 WIRE/ 3 WIRE SETTING REOCNTR TG R38 10k A2 ROSC C15 100pF 10k R16 1M 2 10K REOIN VSS LED GND LED R37 GND 10k 3 TOUCH SENSITIVITY SETTING 2 S RHEO Q2 D G 1 RLED GND 3 OPTIONAL RHEOSTAT GND Figure 3-1: Connection Diagram for an AC supply in 3-wire mode, Leading Edge dimmer with Triac Control Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 5 of 50 February 2008 IQ Switch® ProxSense™ 4 Capacitive Sensing 4.1 Sense Plate Capacitance The sense plate can be any electrically conductive object. This includes glass or perspex plates with a conductive surface, or the base of a metal desk lamp. The sense plate is connected to the CX Pin. The capacitance of the CX plate is referred to as CX. 4.2 Figure 4-1 : Coupling with the human hand will increase the capacitance of the sense plate. There exists a capacitance between any reference point relative to ground, as long as electrical isolation exists between them. If this reference point is a sensing plate, it helps to think of it as a capacitor. The positive plate of the capacitor is the sensing plate, and the negative plate is formed by the surrounding area (virtual ground reference, labelled 1 in Figure 4-1). When an object is brought into proximity of the sensing plate, there will be increased coupling between the two and the capacitance of the sense plate, relative to ground, will increase. For example, a human hand will increase the sense plate capacitance as it approaches the sense plate. Touching the plate will increase the capacitance significantly. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. The Charge Transfer principle To measure a change in CX, the IQS117 employs the charge transfer method of capacitive sensing. Charge is continuously transferred from the CX capacitance into a charge collection capacitor, referred to as CS, until the voltage on CS reaches VTRIP. Throughout this document the following applies when the capacitive sensing is mentioned: the transfer cycle refers to the charging of CX and transferring the charge to the CS capacitor. The charge cycle refers to process of charging CS to VTRIP using charge transfers. The IQS117 is capable of adjusting to environmental changes. It tracks the average capacitance of the sense plate. This average value is compared to the latest charge cycle to determine whether a proximity or touch occurred. IQS117 Datasheet v2.03 Page 6 of 50 February 2008 IQ Switch® ProxSense™ 4.3 Designing the Capacitive Sensing Circuit Figure 4-2 shows the circuitry needed to implement the capacitive sensing. IQS117 VDD CS R35 10k CS ROSC GND SENSE_PLATE TRPSEL R36 10k OSC PROXIMITY SENSITIVITY SETTING POPULATE EITHER OR NONE RX CX REOIN 10k GND R37 VSS GND GND Figure 4-2: Capacitive Sensing Circuit 4.3.1 Oscillator (Transfer Rate) The oscillator frequency is set by ROSC. The oscillator is used to determine the rate at which the charge transfers occur. Maximum efficiency is achieved when enough time is allowed to fully charge CX to VDD and then completely transfer this charge to the CS capacitor. Table 4-1: Different values for the Transfer Rate as determined by ROSC ROSC Transfer Rate 10kΩ 625kHz 22kΩ 300kHz 30kΩ 230kHz 75kΩ 95kHz 100kΩ 70kHz The series resistor Rx in the CX charge path influences the transfer cycle negatively. This resistor is needed to ensure that the user is safe from electrical shock when touching the sense plate (if the conductive area is not isolated) and also provides extra ESD protection. 300 kHz is a good choice of transfer rate under normal circumstances. Typically RX is ranged between 1kΩ and 2kΩ. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 7 of 50 February 2008 IQ Switch® ProxSense™ Figure 4-3: Ideal charge transfers Figure 4-5: Non-ideal charge transfers Figure 4-4: Charge cycle as the result of ideal charge transfers Figure 4-6: Charge cycle as the result of non-ideal charge transfers Figure 4-3 and Figure 4-4 shows how the ideal sense plate voltage of a charge transfer and charge cycle should look. Notice that in Figure 4-3, the sense plate charges up to VDD. Figure 4-5 and Figure 4-6 shows the sense plate voltage of non-ideal charge transfers and the resulting charge cycle. Notice in Figure 4-5 that the sense plate does not charge up to VDD, but to 3.08V instead. Comparing Figure 4-6 to Figure 4-4, the offset is due to the fraction of the sense plate charge not being transferred to the CS capacitor. These problems can be corrected by either decreasing the transfer rate (by increasing ROSC), or decreasing RX. capacitance by a few Pico-farads, depending on the probe used. This will have an instant negative influence on the sensitivity of the system when it is attached. After a short while the system will adjust to accommodate this change. 4.3.2 Cs Capacitors The function of the CS capacitor is to collect the charge from the sensing plate. It also influences the sensitivity of the system. The charge cycle duration refers to the time needed to complete one CS charge cycle when no proximity or touch is occurring (thus the longest duration of a charge cycle with the current system parameters). Use a X7R or better capacitor. Please refer to the “Capacitor Selection Guide” (document number AZD0002) regarding the choice of CS capacitor, at www.Azoteq.com. Please note that attaching a probe to the sense plate will increase the sense plate Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 8 of 50 February 2008 IQ Switch® ProxSense™ Figure 4-7: Timing of the charge cycles A bigger CS capacitor will ensure that the CX capacitance is computed with more resolution. This will increase the sensitivity of the device. If an AC supply is used, the charge cycle is always synchronized to the positive zero crossings of the AC line voltage, as shown in Figure 4-7. The charge cycle will start TCHARGE after the positive half cycle started. If the charge cycle is allowed to continue until the following positive half cycle starts, it will have a negative influence on the response time of the system, since then the next charge cycle will only be started in 2 half cycles' time. If the charge cycle is too short, it will influence the sensitivity of the system negatively. The ideal charge cycle ends 100µs before the end of the half cycle. Thus the ideal charge cycle duration is (9.9 ms – TCHARGE) for 50 HZ and (8.6ms – TCHARGE) for 60 Hz. The charge cycle duration can be determined by probing the CS pin with an oscilloscope. minimum and maximum charge cycle duration is determined by the following. 1. Minimum – every charge cycle must consist of at least 32 charge transfers. 14 2. Maximum – no more than 2 charge transfers are allowed in a charge cycle. A larger sense plate surface will require a larger CS capacitor and vice versa. Since the CX capacitance is normally unknown, it is easiest to design the CS capacitor using a trial-and-error method. The CS capacitor will typically be ranged between 10nF to 1µF. In DC mode, the IQS117 generates an internal reference and synchronises the charge cycles using the same method as described for an AC supply. These recommended charge cycle duration values are only design guidelines. The Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 9 of 50 February 2008 IQ Switch® ProxSense™ RANGE 1 RANGE 2 Table 4-2: Proximity Algorithm Sensitivity TRPSEL Condition at POR LOW FLOATING D B D A HIGH E C Figure 4-8: Proximity Algorithm Sensitivity Scale 4.3.3 Determining a Proximity/Touch The IQS117 is capable of differentiating between a sense plate proximity and touch. The sensitivity of detecting these conditions is determined at Power-On-Reset (POR) and can be adjusted. 4.3.3.1 Proximity Sensitivity The Proximity Algorithm Sensitivity is determined at POR by the condition of the TRPSEL pin. Depending on the device in the IQS117 family (see section 8), two ranges of Proximity Sensitivity is available, as described in Table 4-2. Please note that noise in the environment will cause the IQS117 to falsely detect proximities if the sensitivity is increased too much. If the environment of the system is prone to noise, the sensitivity of the system needs to be decreased, at the expense of the range of the proximity detection. The proximity detection sensitivity is determined by three factors. 1. The value of CS determines the resolution of the CX computation. A higher CS will increase the resolution and the sensitivity. 2. The sensitivity of the detection algorithm, as determined by the condition of the TRPSEL pin at POR. 3. The way in which the sense plate couples with an approaching human hand will also influence the sensitivity. 4.3.3.2 Touch Sensitivity The Touch Algorithm Sensitivity is determined at POR by the condition of the REOIN pin. The pin is multiplexed and also serves as the rheostat input. Two settings are available, as described in Table 4-3. When a rheostat is connected to the IQS117, a pull-down resistor is not allowed on the REOIN pin. This implies that only the higher touch sensitivity setting is available when a rheostat is connected to the IC. Table 4-3: Touch Algorithm Sensitivity REOIN floating or connected to rheostat REOIN pulled low High Touch Sensitivity Low Touch Sensitivity Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 10 of 50 February 2008 IQ Switch® ProxSense™ 5 is selected by a pull-up resistor on the REOCNTR pin. Regulator Design This chapter contains a conceptual description of how the IQS117 external regulators work. Please refer to the IQS117 regulator application note on the Azoteq website for detailed design examples. It is important that the IQS117 has a very stable operating voltage. The input voltage (VDDHI) is regulated to a stable voltage VDD. If the VDD voltage fluctuates it will have a detrimental effect on the charge transfer which could ultimately cause false proximity detections. The IQS117 is capable of controlling external regulators which can be connected in a variety of configurations, allowing the device to be operated in both AC and DC environments. It is able to control a series, shunt and boost regulator which can operate independently or in conjunction with each other. 5.1 2 Wire/ 3 Wire Operation The device can be configured to work in either a 3 Wire or a 2 Wire application. Figure 5-1: 3 Wire Setup When the IQS117 operates in 3 Wire Mode, TM the ProxSense circuit must be connected between the live and neutral supply connections. The load must be connected between the switching device and live. In TM this setup configuration, the ProxSense IC is continuously supplied with power, since it is connected in parallel with the load. These operating conditions are only possible if both the neutral and live connections are available. Typical applications for this setup are lighting solutions that plug into a wall AC outlet, like bed- or desk lamps. 3 Wire Mode Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. Figure 5-2: 2 Wire Setup Lighting wall switches in buildings are usually connected between live and the TM load. To use the ProxSense circuit as a wall switch, it must be connected in series with the load, called 2 Wire Mode. This will TM IC not being result in the ProxSense supplied with power from the live connection while the load is switched ON. The regulator design and timing ensures that the IC is powered. 2 Wire mode is selected by a pulldown resistor on the REOCNTR pin. 5.2 LED The current drawn by the LED has an important influence on the design of the regulator. The LED pin is capable of sourcing an instantaneous current of ILED_INST_MAX. In AC mode, or the 2 wire DC option, the LED pin is pulsed with the VDDHI voltage for TBOOST after TZCDB from the start of every half cycle when it needs to be on, as shown in Figure 5-4. In a 3 Wire DC Mode the LED will be continuously sourced with VDDHI while in the on condition. RLED must be used to limit the instantaneous LED current to ILED_INST_MAX or less. Two or more LED's can be connected in parallel, as long as the sum of their currents does not exceed the ILED_INST_MAX limit. If the LED needs to be sourced with more than ILED_INST_MAX, the LED pin signal can be used to control a transistor. The LED can now be sourced directly from VDDHI, and the transistor can be used to switch the LED ON and OFF. The current drawn by the LED must be accounted for when designing the regulator. IQS117 Datasheet v2.03 Page 11 of 50 February 2008 IQ Switch® ProxSense™ IQS117 When in 3 Wire DC mode the LED pin voltage remains high when the LED is turned on and the average LED current is also given by the same equation. V I LED _ AVG = DDHI 5-2 RLED RLED LED GND Figure 5-3: LED Circuit The instantaneous LED current during the TBOOST pulse is determined using I LED _ INST = VDDHI RLED In AC mode and the 2 wire DC option, with the LED ON voltage as in Figure 5-4, the average LED current is given by V 2(TBOOST ) I LED _ AVG = DDHI 5-3 RLED TAC with TAC the period of the AC supply. 5-1 Figure 5-4: LED pin voltage in ON condition using the AC Mode, or 2 Wire DC Mode Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 12 of 50 February 2008 IQ Switch® ProxSense™ 5.3 External Boost- and Series Regulator – Proposed Leadingedge 2 Wire Design RHIGH D6 R61 R66 RINT2 R64 2 3 Q3 Q5 1 R60 1 D5 D8 3 2 R71 C3 + C60 2 C61 R65 1 2 100nF S G 1 3 RINT1 3 Q4 GND D R62 R63 GND Figure 5-5: Conceptual Boost- and series regulator At start up, the IQS117 requires ISTARTUP. This current must be provided by the low current path through RHIGH, as depicted in Figure 5-5. The value of RHIGH can be determined using RHIGH = 2V AC _ RMS − VBOOST (2)( I STARTUP ) . 5-4 will rise. When HVSENSE reaches VHVSENSE, PWRCNTR will go low and Q4 and Q3 will switch off. For 3 Wire applications, the PWRCNTR pin is allowed to go high at any time the HVSENSE voltage drops below VHVSENSE. For 2 Wire applications PWRCNTR is only allowed to be active for TBOOST during every half cycle, as shown in Figure 5-6. When the LED is on, the LED pin pulses will be at the exact same time that the PWRCNTR pulses are allowed to occur. The VBOOST voltage can be chosen with the voltage divider formed by R64 and R65: VBOOST = VHVSENSE R64 + R65 R65 5-5 A typical value for VBOOST would be between 7V and 30V. Figure 5-6: PWRCNTR Pulse (AC Mode) After the IQS117 is powered up, it is capable of regulating the high side voltage (VDDHI) using the boost regulator. The HVSENSE pin is an input to an internal comparator which senses on VHVSENSE. When the HVSENSE voltages drops below VHVSENSE, the PWRCNTR pin goes active high and Q4 and Q3 will be switched on. With Q4 switched on, current will flow through Q3 (high current path) and the VBOOST voltage The RMS voltage of the supply during TBOOST can be determined by: Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. When the PWRCNTR pin is active, the boost regulator is enabled. D5 half wave rectifies the AC input, so C60 will not be charged when PWRCNTR is active in the negative half cycle. This means C60 can only be charged for a maximum time of TBOOST during each AC cycle. It is important that enough charge is transferred into C60 during this short period to power the IQS117 during the rest of the AC period. IQS117 Datasheet v2.03 Page 13 of 50 February 2008 IQ Switch® ProxSense™ VBOOST RMS with = 1 TBOOST 2 TZCDB +TBOOST ∫ (( 2 )V AC _ RMS ) . sin( 2π . f AC .t ) dt 5-6 TZCDB f AC being the frequency of the AC supply. The average boost current (high current path) required during the PWRCNTR pulse is determined by the IC current and the instantaneous LED current during the PWRCNTR pulse. The IC current needs to be translated to the TBOOST period. I BOOST T = I IQS117 AC + (2.I LED _ INST ) TBOOST 5-7 If the LED is not turned on, less power will be needed by the system. The regulator will automatically adjust the ON time of the PWRCNTR pulse during. This means that the average IBOOST will be smaller when the LED is not on, compared to when the LED is powered. The breakthrough voltage of D6 needs to be higher than the regulated VBOOST voltage as the purpose of the zener is to protect the circuit of any over voltages. Q5 is used to realize an external serial regulator by connecting the base of the transistor to the open drain SHNT pin. The SHNT voltage will be adjusted to ensure that Q5 is switched on at a level that will maintain the voltage drop VCE for the correct VDDHI voltage. This type of regulator is well suited to 2 wire applications, but will also work with 3 wire applications. Power is only used as it is required by the system, making this a very efficient regulator. For 2 wire applications the ripple of the VBOOST voltage needs to be designed for. The choice of C60 will determine the ripple of the VBOOST voltage. The value can be determined using: (iIQS117 )(TAC − TBOOST ) + (iLED _ INST )(TBOOST ) 5-8 C60 = ∆V with ∆V being the change in the VBOOST voltage. Equation 5-8 only applies to 2 Wire applications. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 14 of 50 February 2008 IQ Switch® ProxSense™ 5.4 Internal Shunt Regulator – Proposed Leading-edge 3 Wire Design RSERIES D3 D4 + C3 RINT3 C40 D S G 1 RINT4 GND 2 3 GND Figure 5-7: Shunt Regulator If SHNT is connected to VDDHI, a shunt regulator is formed by an active zener internal to the IQS117. Resistor RSERIES is used to design the current flowing to the device. Zener diode D4 provides over-voltage protection and should be chosen to be higher than VDDHI, but less than the specified maximum voltage. The current that is required through the series resistance RSERIES when the LED is turned on can be determined by: I SHNTREG = I LED _ AVG + I IQS117 5-9 The RMS voltage over the series resistance is given by: VSERIES _ RMS = 2 (V AC _ RMS ) − VDDHI 5-10 2 RSERIES can now be determined from the results of 5-9 and 5-10. This type of power supply will always deliver a fixed amount of current to the device. The part of this allocated current that is not used by die Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 and the LED will be dissipated by the SHNT pin. This means that the SHNT current will be higher when the LED is off. It is important that the maximum SHNT pin current (ISHNT_MAX) is not exceeded. This can happen for a larger ILED_AVG. For this situation, the SHNT pin in Figure 5-7 can also be left unconnected. This will cause all the excess power to be absorbed by the zener diode D4, allowing larger shunt currents. With the shunt regulator as shown in Figure 5-7, the function of diode D4 is only to provide overvoltage protection. C40 must be 1µF to reduce oscillation of the shunt regulator to a minimum. Although this power supply is not as efficient as the boost and series regulator, it is much more cost effective. This supply regulator is recommended for 3 wire applications. It will not work with a 2 wire setup. IQS117 Datasheet v2.03 Page 15 of 50 February 2008 IQ Switch® ProxSense™ 5.5 External Boost- and Series Regulator – Proposed Trailingedge 2 Wire Design 3 Q3 D6 R61 Q4 C60 2 2 GND D C61 R65 1 C3 + R62 3 GND R66 RINT2 R64 100nF S G 1 3 RINT1 1 R60 Q5 1 3 2 R71 2 RHIGH R63 GND Figure 5-8: Conceptual Boost- and series regulator for Trailing-edge dimmer The main difference between the Trailing-edge and Leading-edge boost regulator is the fullwave rectifier used on the leading edge dimmer. Conceptually both regulators work the same. Equations 5-4, 5-5 and 5-6 stay the same when using the Trailing-edge boost regulator. C60 can now be charged in every half cycle. This causes equation 5-7 to change to I BOOST = I IQS117 TAC + ( I LED _ INST ) 2.TBOOST and equation 5-8 to change to T (iIQS117 )( AC − TBOOST ) 2 C60 = ∆V Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. 5-11 5-12 IQS117 Datasheet v2.03 Page 16 of 50 February 2008 IQ Switch® ProxSense™ 5.6 Internal Shunt Regulator – Proposed Trailing-edge 3 Wire Design RSERIES D4 + C3 RINT3 C40 GND 2 D S G 1 RINT4 GND 3 GND Figure 5-9: Shunt Regulator for Trailing-edge Dimmer Since a full-wave rectifier is used with the trailing-edge dimmer, equation 5-10 changes to VSERIES _ RMS = 2 (V AC _ RMS ) − VDDHI 5-13 The rest of the regulator design is exactly the same as in section 5.4. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 17 of 50 February 2008 IQ Switch® ProxSense™ 6 Load Control 6.1 Trailing-edge or Leadingedge Devices IQS1170xx 00 – IQS1170xx 15 employs leading-edge dimming. A Triac is used to power the load. Devices IQS1171xx 30 – IQS1171xx 45 employs trailing-edge dimming. A High Power MOSFET or IGBT can be used to power the load. When using the device under these conditions, a full-wave rectifier (bridge) must be used. 6.2 AC or DC Mode The IQS117 uses the ZC pin to detect whether the device is being used with an AC or DC supply voltage. For Leading-edge AC operation, the ZC pin is connected to the supply voltage via the circuit shown in Figure 6-1. R12 should be in the order of 1MΩ to limit current from the supply into the pin. For Trailing-edge AC operation, the ZC pin is connected to the supply voltage via the circuit shown in Figure 6-2. R12 should be in the order of 1MΩ to limit current from the supply into the pin during the positive half cycle. Due to the bridge used with the trailing-edge dimmer, the ground reference will never be lower than –VD of the bridge diodes with respect to the live connection. This problem can be fixed by using the diode and R13 in Figure 6-2. To set the device in DC mode, ZC must be pulled low. 6.3 1M R10 IQS117 R12 ZC 1M 1M 100pF GND GND Figure 6-1: ZC circuit to be used with a leading-edge dimmer with AC supply 1M R10 IQS117 R12 1M ZC 1k 1M R13 R11 GND Please note that information in Section 6.3 and all subsections of Section 6.3 only applies to devices IQS1170xx 00 – IQS1170xx 15. When one of the IQS1170xx 00 – IQS1170xx 15 devices are configured to operate with an AC supply voltage, a triac must be used to control the load C10 R11 Triac Control C10 100pF The triac is controlled by the TG pin. When the triac needs to be fired to power the load, the output of the TG pin is a square wave of magnitude VDDHI. In Figure 6-3, resistor R25 ensures that the triac gate is pulled low when no signal is applied. C25 is connected between the TG pin and the triac gate and ensures that enough current is provided to the triac gate when it needs to be switched on. GND Figure 6-2: ZC circuit to be used with a trailing-edge dimmer with AC supply Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 18 of 50 February 2008 IQ Switch® ProxSense™ L1 6.3.1 EMC Filter LIVE LOAD(+) LOAD(-) IQS117 R30 A2 A1 100nF TG G 6.3.2 Incandescent / CFL Load 10K C30 RV1 C25 D1 A filter is needed to ensure that the system complies with EMC standards. The type of filter recommended is shown in Figure 6-3 and formed by L1, C30 and R30. Different countries require different EMC standards on dimmer controllers. Refer to local regulations for compliance to these standards. R25 VSS NEUTRAL GND Figure 6-3: Triac circuit with the IQS117 (3 Wire) Because of their physics, conventional compact fluorescent lights (CFL's) are not dimmable. A CFL only conducts for a short while during each cycle. Conventional dimmers are not capable of controlling CFL's. Even if the dimmer setting is set at full power, the CFL will flicker, greatly reducing its lifespan. The IQS117 allows the user to select between an incandescent and a CFL load. By fixing the VSW pin voltage at V DD (within 2 5% accuracy) an incandescent load will be selected. This will enable the user to select various dimming levels. Figure 6-4: Firing Angle of the Triac The firing angle of the triac (referred to as θ) is measured from the end of each half cycle to the beginning. A θ of 0° responds to the triac not being switched, while a θ of 180° indicates that the triac will be fired at the start of each half cycle. The power transferred to the load is dependant on the value of θ. Figure 6-5 shows the load and triac gate current for a θ of 90°. When the VSW pin is either pulled high or low, the IQS117 will enter CFL mode and the triac will only be fired in the middle of the half cycle (θ = 90°). This is the optimum point for driving a CFL. The CFL will switch on at full power. The user will not be able to dim the load. A CFL can not be used with the 2 wire configuration with the IQS117. The circuit shown user to make incandescent and double-throw type can be operated powered. in Figure 6-6 will allow the the choice between an a CFL load. A single-pole, switch is used. The switch with the IQS117 still being Figure 6-5: 50% Power transferred to the load Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 19 of 50 February 2008 IQ Switch® ProxSense™ supply voltage, a High Power MOSFET or IGBT must be used to control the load. 1M R15 The Switching device is controlled by the TG pin. When the switching device needs to be turned ON to power the load, the output of the TG pin is high with a magnitude VDDHI. IQS117 3 CFL LOAD ENABLE/DISABLE 1 VSW C15 100pF 1M 2 The time when the switching device is turned is measured in degrees from TCHARGE after the start of each half cycle to the end, see Figure 6-7. A θ of 0° responds to the switching device not being turned on, while a θ of 180° indicates that the switching device is always on. The power transferred to the load is dependant on the value of θ. R16 VSS GND Figure 6-6 : Circuit used to select a CFL/Incandescent load. (Position2 = Incandescent, Position3 =CFL). 6.4 MOSFET and IGBT Control Figure 6-8 shows the circuit needed to use a high voltage MOSFET to control the load. Please note the full-wave rectifier needed to ensure that the current through the switching device is always positive. Please note that information in Section 6.4 and all subsections of Section 6.4 only applies to devices IQS1171xx 30 – IQS1171xx 45. When one of the IQS1171xx 30 – IQS1171xx 45 devices are configured to operate with an AC Figure 6-7: Firing Angle of the MOSFET or IGBT LIVE LOAD(+) LOAD(-) GND R25 2 D Q1 S G 1 R26 IQS117 TG C26 C25 3 VSS NEUTRAL GND Figure 6-8: High Voltage MOSFET circuit with the IQS117 (3 Wire) Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 20 of 50 February 2008 IQ Switch® ProxSense™ 6.4.1 EMC Filter The circuit formed by C25, C26, R25 and R26 allows the rate at which the switching device turns on to be controlled. If this rate is decreased enough it will ensure that the dimmer complies with EMC regulations. Please note that the decreased turn-on-rate of the switching device will increase the amount of power dissipated in the device and may cause some issues with heat. Please refer to local regulations for EMC compliancy. 6.6 6.4.2 Incandescent / CFL Load The IQS1171xx 30 – IQS1171xx 45 devices are not capable of controlling CFL loads. The VSW pin must always be pulled low. 6.5 DC Loads LOAD(+) LOAD(-) IQS117 VPOS 3 D Q1 S G 1 If any device in the IQS117 family is configured to operate with a DC supply voltage, a transistor is used to control the load. The transistor will be controlled using the TG pin. The output of the TG pin is a 100Hz PWM signal with amplitude VDDHI. The VSW pin can be left unconnected. On the IQS1170xx 11, the duty cycle of the TG PWM signal is 100% for the ON condition. The rest of the power levels are specified in section 10. R20 TG 2 Desensitising the System Whenever the load is turned on, the proximity detection sensitivity is decreased to compensate for any noise that may be caused by switching the load. Also, after the load is turned off, the device will ignore any proximity detected for TPROXIGNR. This allows the user time to take his hand away from the sense plate after switching the load off without having the device going into FITD mode. During this time, the LED will light up when a proximity occurs, but it will not latch on for TLATCH. Touch conditions will not be ignored during this period. VSS GND GND Figure 6-9: A MOSFET circuit to control a DC load VLOAD 0 5ms 10ms 15ms 20ms VDDHI TG 0 Figure 6-10: The PWM pulse signal with load at 50% power Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 21 of 50 February 2008 IQ Switch® ProxSense™ 7 Special Features 7.1 Rheostat When a rheostat is connected to the IQS117 as shown in Figure 7-1, it replaces any other method of dimming selection. The position of the wiper will determine the dimming level of the load. resistance on the REOIN pin. To determine the wiper position, Q2 is turned on and CS is again charged to VTRIP through the resistance on the REOIN pin. The ratio between the lengths of the two charges reveals the position of the rheostat wiper. A rheostat connected to the device will override any other modes determined by the user interface. The rheostat will be the only factor in determining the dimming level. Actuations will only be used to turn the load on and off. IQS117 2 REOCNTR 1 G S Q2 D RHEO 3 The rheostat will be measured in the negative half cycle of the supply voltage if an AC supply is used or the negative half cycle of the internal 50Hz reference if the device is used in DC mode. The device will alternate between measuring the full range and the wiper position, as described in Figure 7-2. REOIN Figure 7-1: Rheostat connected to the IQS117 At POR, the IQS117 determines whether a rheostat is present. The CS capacitor is utilised to determine the wiper position. To determine the full range of the rheostat, Q2 is turned off and the CS capacitor is charged to VTRIP through the The designer must always ensure that the rheostat Full Range Charge duration is shorter than the supply voltage half cycle. A typical value for the rheostat resistance is 50kΩ. When a rheostat is connected, the REOIN pin cannot be pulled low to execute a Touch Level selection. Figure 7-2: Measuring the Rheostat Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 22 of 50 February 2008 IQ Switch® ProxSense™ 7.3 The pins on the IQS117 are designed with extra protection against electrostatic discharge (ESD). Pins rated for 8kV ESD protection on the Human Body Model: • SW • CX • VSS • VDDHI Pins rated for 2kV ESD protection on the Human Body Model • TEST • ZC • VSW • TG • LED • VDD • HVSENSE • SHNT • OSC • REOCNTR • REOIN • CS • TRPSEL • PWRCNTR Switch Some of the devices in the IQS117 family allow the user to use a switch instead of touching the sense plate. The device still uses the sense plate to detect proximities. IQS117 VDD 3 ESD Protection SW 1 7.2 SW Figure 7-4: Switch connected to the IQS117 Any Push-to-Make type switch can be used. A 10kΩ internal pull-down allows the switch to be connected directly between the SW pin and VDD. To determine if the switch is pressed, a debounce period of TSW is used. 10k R7 D2 2 SENSE_PLATE IQS117 BAV99 C7 CX 3 10uF 1 RX GND Figure 7-3: External ESD protection If the conductive area of the sense plate is not electrically isolated from user, one type of circuit the designer may include is described in Figure 7-3. This will provide the system with extra ESD protection over that provided internal to the device. The capacitance of D2 will influence the system, so care should be taken when choosing this diode. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 23 of 50 February 2008 8 User Interface (UI) Table 8-1: Summary of UI options available on the leading-edge IQS117 IC's Find-in-the-Dark User Interface Algorithm Enhancements (FITD) Main Actuation Mode Single Hard Rheostat Continuous CFL Auto Backlight light as Memory Stepping Mode on/off dimming Dimming Mode off FITD Type FITD Proximity Range Typical Application IQS1170xx00 ● ○ ○ ○ ● ● ● ○ ● ● Switch RANGE 1 Desk lamp IQS1170xx01 ● ○ ○ ○ ● ● ● ○ ● ○ Switch RANGE 1 Wall switch IQS1170xx02 ● ○ ○ ○ ● ● ● ● ● ● Switch RANGE 1 Desk lamp with Auto-off IQS1170xx04 ● ○ ○ ○ ● ● ● ○ ● ● Touch RANGE 1 Desk lamp (touch) IQS1170xx05 ● ○ ○ ○ ● ● ● ○ ● ○ Touch RANGE 1 Wall switch (touch) IQS1170xx06 ● ○ ○ ○ ● ● ● ● ● ● Touch RANGE 1 Desk lamp (touch) with Auto-off IQS1170xx07 ○ ● ○ ○ ● ● ● ○ ● ○ Touch RANGE 1 Wall switch (touch) IQS1170xx08 ● ○ ○ ○ ● ● ● ○ ● ● Switch RANGE 2 Desk lamp IQS1170xx09 ● ○ ○ ○ ● ● ● ○ ● ○ Switch RANGE 2 Wall switch IQS1170xx10 ○ ○ ● ○ ○ ● ● ○ ● ● Touch RANGE 1 Desk lamp (touch) – dimmer with memory IQS1170xx11 ○ ○ ○ ● ○ ○ ● ○ ● ○ Touch RANGE 1 Appliance Control IQS1170xx12 ● ○ ○ ○ ● ● ● ○ ● ● Touch RANGE 2 Desk lamp (touch) IQS1170xx13 ● ○ ○ ○ ● ● ● ○ ● ○ Touch RANGE 2 Wall switch (touch) IQS1170xx14 ○ ○ ● ○ ○ ● ● ○ ● ○ Touch RANGE 1 Wall switch (touch) - dimmer with memory IQS1170xx15 ○ ● ○ ○ ● ● ● ○ ● ○ Touch RANGE 2 Wall switch (touch) Key: ● = Implemented ○ = Not implemented Table 8-2: Summary of UI options available on the trailing-edge IC's Find-in-the-Dark User Interface Algorithm Enhancements (FITD) Back Single Momentary Rheostat Continuous CFL AutoMain light Actuation Mode Memory light Mode Stepping Mode Output dimming Dimming off as FITD Type FITD Proximity Range Typical Application IQS1171xx30 ● ○ ○ ○ ● ● ○ ○ ● ● Switch RANGE 1 Desk lamp IQS1171xx31 ● ○ ○ ○ ● ● ○ ○ ● ○ Switch RANGE 1 Wall switch IQS1171xx32 ● ○ ○ ○ ● ● ○ ● ● ● Switch RANGE 1 Desk lamp with Autooff IQS1171xx34 ● ○ ○ ○ ● ● ○ ○ ● ● Touch RANGE 1 Desk lamp (touch) IQS1171xx35 ● ○ ○ ○ ● ● ○ ○ ● ○ Touch RANGE 1 Wall switch (touch) IQS1171xx36 ● ○ ○ ○ ● ● ○ ● ● ● Touch RANGE 1 Desk lamp (touch) with Auto-off IQS1171xx37 ○ ● ○ ○ ● ● ○ ○ ● ○ Touch RANGE 1 Wall switch (touch) IQS1171xx38 ● ○ ○ ○ ● ● ○ ○ ● ● Switch RANGE 2 Desk lamp IQS1171xx39 ● ○ ○ ○ ● ● ○ ○ ● ○ Switch RANGE 2 Wall switch IQS1171xx40 ○ ○ ● ○ ○ ● ○ ○ ● ● Touch RANGE 1 IQS1171xx41 ○ ○ ○ ● ○ ○ ○ ○ ○ ○ Touch RANGE 1 IQS1171xx42 ● ○ ○ ○ ● ● ○ ○ ● ● Touch RANGE 2 Desk lamp (touch) IQS1171xx43 ● ○ ○ ○ ● ● ○ ○ ● ○ Touch RANGE 2 Wall switch (touch) IQS1171xx44 ○ ○ ● ○ ○ ● ○ ○ ● ○ Touch RANGE 1 Wall switch (touch) dimmer with memory IQS1171xx45 ○ ● ○ ○ ● ● ○ ○ ● ○ Touch RANGE 2 Wall switch (touch) Desk lamp (touch) – dimmer with memory Microprocessor Interface Key: ● = Implemented ○ = Not implemented IQ Switch® ProxSense™ Table 8-1 and Table 8-2 summarises the functionality of every member of the IQS117 family. will turn on during this period to help a user locate the dimmer position in darkness, known as the Find-in-the-Dark (FITD) mode. Some of the ICs in the IQS117 family will also switch on the main load at the LO power level during TLATCH at a low power level. See Table 8-1 and Table 8-2. This function is not available on the IQS1171xx41. The IQS1171xx41 operation is described in section 8.2.5. 8.1.1 Actuation Type The actuation input is the user’s way of interacting with the ProxSense™ system. Two methods are available. The sense plate can be touched, or a button between SW and VDD can be pressed to make an actuation. The device will only check for one of the two in determining if an actuation is occurring. The method used for actuations is determined by which IC in the IQS117 family is used. The LED is pulsed at a frequency of fLED_FLASH for as long as the user actuates the switch or the touch interface. This provides the user with feedback that an actuation is being made (as a substitution to the familiar ‘click’ of an electromechanical switch). 8.2 User Interface Algorithm The designer can choose between one of four different user interface algorithms available on the IQS117 as described in the following sections. 8.2.1 Mode Stepping 8.1.2 Find-in-the-Dark (FITD) Upon the detection of a proximity, the IQS117 will indicate this for a period of TLATCH. The LED Proximity Detected Long Press before TLATCH START FROM MIN FITD Mode Continuous dimming for as long as the actuation occurs Long Press After TLATCH Long Press Proximity Detected Short Press before TLATCH Short Press LOAD ON HI POWER Continuous Dimming mode START FROM MIN LOAD OFF Short Press Short/Long Press after TLIMIT Short/Long Press before TLIMIT LOAD ON MED POWER Short/Long Press before TLIMIT Short/Long Press after TLIMIT Short/Long Press LOAD ON LO POWER Figure 8-1: Mode Stepping state diagram Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 26 of 50 February 2008 IQ Switch® ProxSense™ SW SW T < TSELECT T > TSELECT 1 0 Power Level HI Power Level HI USER LEVEL SON SAA MIN MIN TFLASH 0 Mode Stepping actuation Continuous Dimming actuation Figure 8-2: Distinction between a short and a long actuation Mode Stepping is the patented UI which has been employed with great success in Azoteq’s ® IQ Switch technology for flashlights and headlamps. device entering Continuous Dimming Mode. A short flash for a period of TFLASH indicates to the user that Continuous Dimming has started (see section 8.3). Figure 8-2 illustrates how the device will react differently between a short and a long actuation. An actuation for a period less than TSELECT will result in the load being switched on at full power. Actuations longer than TSELECT will result in the Dynamic Switch Selection (DSS) is the method whereby Mode Stepping is realised. Figure 8-3 illustrates the process. There are four fixed power levels defined, HI, MED, LO and MIN. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 27 of 50 February 2008 IQ Switch® ProxSense™ Figure 8-3: Mode Stepping timing diagram With a short actuation (TSW < T < TSELECT) the load will start up at MIN Power level for as long as the actuation is valid, and then slew to HI Power at a slope of SON. If the next actuation (short or long) occurs before TLIMIT is reached, the load will slew to MED Power and again to LO Power if the next short actuation occurs before TLIMIT is reached. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. After the LO Power level has been reached, a short (T < TSELECT) or a long (T > TSELECT) actuation will switch the load off. The power level will slew from the LO to MIN power level at SOFF, and once it reaches MIN, immediately fall to zero. If the load is at the MED or HI level, TLIMIT must pass before the load can be switched off by an actuation. Once again, the power level will slew to the MIN Power level at SOFF, and once it reaches MIN, immediately fall to zero. IQS117 Datasheet v2.03 Page 28 of 50 February 2008 IQ Switch® ProxSense™ 8.2.2 Single Mode Figure 8-4: Single Mode state diagram Single Mode is very much like Mode Stepping, except that no MED or LO Power levels are available. A short actuation from OFF or FITD Mode will result in the load switching on in HI Power. From this state, a short actuation will switch the load off. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. From any state, a long actuation will result in Continuous Dimming Mode, starting at the currently active load power level. IQS117 Datasheet v2.03 Page 29 of 50 February 2008 IQ Switch® ProxSense™ Figure 8-5: Single Mode timing diagram Figure 8-5 illustrates Single Mode. A short switch/touch actuation (T < TSELECT) 1, causes the load to switch on at HI Power level. Should another short actuation be performed, the load will switch off. Actuation 2 is received after TLIMIT has elapsed. After TSELECT, a short flash (for TFLASH) indicates to the user that Continuous Dimming is now active. During actuation 2, the load is dimmed to a userselected Power level. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. A long actuation (3) is performed after another unspecified time. A short actuation will switch the load off. Actuation 3 dims the load to the MIN level, with a short flash (TFLASH) indicating to the user that the minimum Power level has been reached, and then continues dimming in the positive direction (power to the load increases). When released, the load stays on at this userselected power level. IQS117 Datasheet v2.03 Page 30 of 50 February 2008 IQ Switch® ProxSense™ 8.2.3 Memory Mode Proximity Detected Long Press before TLATCH Short Press before TLATCH FITD Mode Proximity Detected LOAD ON MEMORY LEVEL After TLATCH Long Press Short Press START FROM MEMORY LEVEL LOAD OFF Short Press START FROM MIN 2nd Short Press after TLIMIT LOAD ON HI POWER 2nd Short Press before TLIMIT Continuous Dimming Continuous Dimming for as long as the actuation occurs START FROM HI Long Press Long Press START FROM MIN Long Press Short Press MEMORY LEVEL STORED Figure 8-6: Memory Mode state diagram The Memory Mode algorithm allows the user to select a dimming level from memory. A short actuation from the OFF or FITD condition will result in the load switching on at the last power level the user selected using the Continuous Dimming Mode (the default memory value is the MIN Power level). Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. From any state, a long actuation will result in Continuous Dimming Mode, starting at the currently active load power level. From the OFF or FITD condition, two short actuations within TLIMIT of each other will result in the load switching on at the HI power level. IQS117 Datasheet v2.03 Page 31 of 50 February 2008 IQ Switch® ProxSense™ Figure 8-7: Memory Mode timing diagram 1 Figure 8-7 illustrates the basic process of Continuous Dimming to a Memory Power level. Note that a short actuation switches the load on at the previously stored memory power level. To dim the load to the HI Power level and down again, Continuous Dimming is employed with a long actuation (2). With actuation 3 the load is dimmed to a user selected level and stored in memory. Figure 8-8 illustrates how, with two actuations (1 & 2) within TLIMIT, the load can be stepped to the HI Power level. With actuation 3 and 4 the load is again dimmed to a user selected level and stored in memory. Figure 8-8: Memory Mode timing diagram 2 Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 32 of 50 February 2008 IQ Switch® ProxSense™ 8.2.4 Hard on/off mode This user interface is useful for applications where a simple ON/OFF switch is required. Every actuation will toggle the load ON/OFF with no slewing between the two power levels. This interface is conceptually the same as a conventional electromechanical switch. Figure 4.12 illustrates how power is transferred to the load in reaction to user actuations in Hard On/Off mode. It does not matter whether the actuation is short or long, or whether TLIMIT has passed or not, the load can only be switched hard on or off. Proximity Detected Proximity Detected Short/Long Press Load OFF Short Press Load ON HI Power Long Press After TLATCH FITD Mode Long Press START FROM MIN Short Press Figure 4.11 – Hard On/Off state diagram Figure 4.12 – Hard On/Off Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 33 of 50 February 2008 IQ Switch® ProxSense™ 8.2.5 Momentary Output This user interface is well suited to be interfaced with a microcontroller, but can still be used as a stand-alone device. In order to use the IQS1171xx 41 with a microcontroller, it is recommended that the device is used in DC mode. The device gives the true output of proximity and touch detection. This means that when a proximity is detected, the output of the LED pin will be HIGH for as long as the proximity is detected. When a touch is detected, the output of the TG pin will be HIGH for as long as the touch condition is detected. *Please note: To provide the user with feedback when the IQS1171xx 41 is used as standalone device, the LED output will flash as described in section 8.1.1. This flashing indicates when a touch condition occurs. There are two solutions to prevent this flashing on the LED pin from interfering with a microcontroller interface. With the IQS1171xx 41 in AC mode, the following applies: • While touch is detected, the output of the TG pin is shown in Figure 6-7 with Θ at the maximum angle. • While a proximity is detected, the output of the LED pin will be same as shown in Figure 5-4.* Firstly, the microcontroller can use a debounce With the IQS1171xx 41 in DC mode, the following applies: • While touch is detected, the output of the TG pin always high. • While a proximity is detected, the output of the LED pin is always high.* time of 1 2. f LED _ FLASH when reading the LED pin. Alternatively, the circuit shown in Figure 8-9 can be used. It will ensure that the output to the microcontroller will not drop more that 1V during the LED pin flashing. However, this circuit will add a 1.5s delay to the microcontroller output voltage before it reaches zero after the proximity condition has ceased. IQS117 LED 470nF 1M OUTPUT TO MICROCONTROLLER VSS GND Figure 8-9: Edge Detection circuit to bypass LED pin flash Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 34 of 50 February 2008 IQ Switch® ProxSense™ 8.3 User Interface Enhancements 8.3.1 Continuous Dimming Mode This feature is the touch- and hold dimming technique that allows the user to select a custom dimming level. The Memory, Mode Stepping and Single Mode algorithms employ this method of dimming. The mode is enabled by actuations longer than TSELECT. The mode uses a gradual in- or decrease in power to the load, from the lowest to the highest and from the highest down to the lowest. This will repeat for as long as the actuation occurs. The power level is set at the value that was reached when the actuation is stopped. Referring to Figure 8-10, a long touch/switch actuation (T > TSELECT) from OFF results in the load starting up at the MIN Power level. A short flash of TFLASH on the load after TSELECT will indicate to the user that the unit is now in Continuous Dimming Mode. After TCONST, the load will slew at a slope of SAB to a power level of A1 (approximately 71.3% power transferred to the load). At reaching A1, the load will slew at an increased slope of SAA to reach the HI Power level. Upon reaching HI, the load will give a short flash for TFLASH to indicate to the user that the maximum power level has been reached. Figure 8-10: Continuous Dimming to the HI Power level Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 35 of 50 February 2008 IQ Switch® ProxSense™ Figure 8-11: Continuous Dimming to the HI and then LO Power levels Figure 8-11 shows what will happen if the actuation is held for a very long time. After the HI Power level has been reached, the load stays at this level for TCONST, and then slews at a slope of SAA until the A1 Power level has been reached. Hereafter, the load will slew at a diminished rate of SAB until MIN Power level has been reached. Once MIN Power level has been reached, the load will flash for TFLASH and stay at this level for TCONST. The process continues indefinitely, until the actuation stops. It is possible to adjust the power level to any user defined setting between MIN Power and HI Power by halting the actuation at any time. This process is illustrated in Figure 8-12. During actuation 1 (a long actuation), the load is dimmed to a User Power level. A period of longer than TLIMIT passes, and another long actuation (2) is performed by the user. The load is now dimmed from the previously dimmed level to the HI Power level. A short time (less than TLIMIT) passes, and a short actuation 3 is performed. The load switches off. A short time (less than TLIMIT) again passes, and a long actuation (4) occurs. The load is again dimmed to a User Power level. A long time (longer than TLIMIT) passes. Once again, a short actuation (5) has the effect of switching the load off. Figure 8-12: Continuous Dimming to user-selected levels Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 36 of 50 February 2008 IQ Switch® ProxSense™ 8.3.2 CFL Mode If the device detects that CFL mode is chosen by the user, the triac is fired at 90 degrees, overriding the user selected level. This ensures proper operation of the CFL. Figure 8-14 illustrates how power is transferred to the load in reaction to user actuations in CFL mode. As with Hard On/Off mode, it does not matter whether the actuation is short or long, or whether TLIMIT has passed or not, the load can only be switched hard on or off. Dimming is not possible in CFL mode. Figure 8-13: CFL mode state diagram Figure 8-14: CFL mode timing diagram Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 37 of 50 February 2008 IQ Switch® ProxSense™ 8.3.3 Rheostat dimming Should the designer choose to use a rheostat as the method of dimming the load, a rheostat is connected to the device to enable rheostat dimming. In Rheostat mode the push button or touch interface is only used to switch the load on and off. When an ON actuation is received, the load is switched on at the current level of the rheostat. The rheostat is continuously sampled and the load adjusted accordingly. A touch/switch actuation only switches the load ON or OFF, while the rheostat is used to dim the load. Figure 8-16 illustrates this process. After actuation 3, the rheostat is varied to select a different dimming level. Figure 8-15: Rheostat Dimming mode state diagram SW 1 1 2 3 0 Power Level Rheostat Level HI Rheostat Level Rheostat Level Rheostat Level MIN Rheostat Dimming 0 Figure 8-16: Rheostat Dimming mode 8.3.4 Auto-off with AAOW Auto-off is an operational mode that switches the load OFF after a pre-determined time, TAUTOOFF, if no actuations was made in this period. Table 8-3- TAUTO-OFF Values Power Level TAUTO-OFF HI Power level 4h MED Power level 4h LO Power level 1h Continuous Dimming mode 1h AAOW is a sequence of flashes on the load that warns the user that Auto-off is imminent, i.e. the load will switch off shortly (within ± 1½ min). Depending on the current power level, the load will dim to approximately half the power level for a 30 second period. A flash is issued and another 30 second period follows; and another, where after the load will fade off. See Figure 8-17 for an explanatory drawing. If a button press, touch or proximity is detected at any of the inputs within this AAOW sequence, the timers will reset, and the power level will return to the initial level before the sequence started. When the Auto-off time (TAUTO-OFF) expires, the IC will enter an auto-off sequence (referred to as Advanced Auto-Off Warning, or AAOW). Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 38 of 50 February 2008 IQ Switch® ProxSense™ Figure 8-17: AAOW Timing Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 39 of 50 February 2008 IQ Switch® ProxSense™ 8.4 Typical Applications 8.4.2 Wall Switch Table 8-1 and Table 8-2 lists the typical applications that ICs in the IQS117 family can be used for. In no way does this mean that the IC is limited to this application – it is only meant to illustrate what the specific combination of features would be well suited for. It is envisioned that new and previously unknown applications will surface for use in many of the options. The typical applications are discussed below as a way to illustrate what the possibilities are. 8.4.1 Desk Lamp The desk lamp environment would likely be a small lamp located on a desk or bedside table. An LED may be located near the switch to indicate its position in a dark environment. In the typical desk lamp application, the main light, together with a backlight LED, is employed as the FITD indication. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. The wall switch environment can be described as a switch located on a wall inside a room. In the typical wall switch application, the main light is not employed as FITD indication. Only the backlight LED is used for this purpose, so that a whole room will not light up when a proximity is detected. 8.4.3 Appliance Control When the IQS117 is used to switch on a device that can not be dimmed, this type of application will be used. The user will also be able to see a backlight light up when coming into proximity to the appliance, should the backlighting LED be used. IQS117 Datasheet v2.03 Page 40 of 50 February 2008 IQ Switch® ProxSense™ 9 Schematics 150k RHIGH D8 6k2 10k C30 400V RV1 C25 D1 3 Q4 G 10K A1 + 50V 47uF + R62 R65 100nF 2 R25 C61 C62 50V 1uF 100nF 1 100k A2 2 3 C60 D6 33V R61 R66 1 R64 100k Q3 820k 1 R60 R30 Q5 100 47k 2 100k D5 3 R71 L1 R63 GND R13 510k C10 1M R12 510k GND 1M R39 100nF R11 GND IQS117 1 2 3 4 5 6 7 8 9 10 GND R15 GND 3 CFL LOAD ENABLE/DISABLE 1 10k 1M R10 TEST ZC VSW TG LED VSS VDD HVSENSE SHNT VDDHI OSC REOCNTR REOIN SW NC CS CX NC TRPSEL PWRCNTR 20 19 18 17 16 15 14 13 12 11 2 S 1 G Q2 D 3 RHEO CS C3 100nF C15 100pF 1M 2 R16 GND GND SENSE_PLATE 10k 2 D2 GND R7 BAV99 ROSC RX 22k 4k7 1 RLED C7 10uF 3 GND GND LED GND Figure 9-1: 220Vac 2 Wire leading-edge dimmer example schematic. Rheostat Used. High Touch Sensitivity setting. TRPSEL left floating. No Switch used. Extra ESD protection Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 41 of 50 February 2008 IQ Switch® ProxSense™ 300k RHIGH R66 100k R64 820k Q3 2 3 Q5 100 1 3 R60 1 100k 2 R71 LIVE C60 + 50V 4.7uF + R62 D S R65 Q4 C61 C62 50V 1uF 100nF 1 G 1 2 R63 C25 3 100k Q1 GND R25 2 R26 3 47k 10k 6k2 D6 33V R61 C26 LOAD(+) GND GND IQS117 510k 510k R14 R11 1M 1 2 3 4 5 6 7 8 9 10 1k C10 1nF GND GND GND TEST ZC VSW TG LED VSS VDD HVSENSE SHNT VDDHI OSC REOCNTR REOIN SW NC CS CX NC TRPSEL PWRCNTR 20 19 18 17 16 15 14 13 12 11 10k R13 1M R10 R12 GND CS C3 R39 100nF GND 22k SENSE_PLATE D2 10k 2 R15 ROSC 1M GND R7 BAV99 GND RX 10uF 3 4k7 C7 1 RLED LED GND GND Figure 9-2 :220Vac 2 Wire trailing-edge dimmer example schematic. No rheostat. High Touch Sensitivity setting. TRPSEL left floating. No Switch used. Extra ESD protection Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 42 of 50 February 2008 IQ Switch® ProxSense™ R50 1k2 D3 D4 C40 + C41 20V 100uF 6V2 100nF 3 D Q1 G 1 S R20 10K 2 10k GND LED GND OSC REOCNTR REOIN SW NC CS CX NC TRPSEL PWRCNTR 20 19 18 17 16 15 14 13 12 11 C3 R37 CS RX 100nF 4k7 RLED TEST ZC VSW TG LED VSS VDD HVSENSE SHNT VDDHI GND GND R36 10k GND SENSE_PLATE Figure 9-3: 12Vdc 3 Wire example schematic. No rheostat. TRPSEL pulled high. High Touch Sensitivity setting. No switch used. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 10k IQS117 1 2 3 4 5 6 7 8 9 10 200R GND R39 10k R11 22k ROSC GND Page 43 of 50 February 2008 IQ Switch® ProxSense™ 10 Device Specifications 10.1 Absolute Maximum Specifications Operating Temperature Storage Temperature Pin Voltage LED pin Maximum Instantaneous Source Current (ILED_INST_MAX) (at VDDHI = 6V) Minimum Turn On Slope Maximum Shunt Current (ISHNT_MAX) ESD Protection (SW, CX, VSS, VDDHI) ESD Protection (TEST, ZC, VSW, TG, LED, VDD, HVSENSE, SHNT, OSC, REOCNTR, REOIN, CS, TRPSEL, PWRCNTR) -30 - +100°C -30 - +100°C 6.5V 25mA 1V/s 10mA 8kV 2kV Exceeding these maximum specifications may cause damage to the device. 10.2 Operating Conditions DESCRIPTION Internal Regulator Output Supply Voltage Start-up current Operating current HVSENSE comparator voltage Digital Input Low Voltage Digital Input High Voltage Shunt/Serial VDDHI Regulating Voltage CS trip voltage TG Pin HIGH Voltage LED Pin HIGH Voltage Power-On-Reset Voltage Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. Table 10-1 PARAMETER MIN VDD 3.0 VDDHI 4.5 ISTARTUP IIQS117 820 VHVSENSE 1.0 VINPUT LOW VINPUT HIGH 0.70VDD VDDHI 5.7 VTRIP 700 VTG_HIGH VLED_HIGH VDDHI IQS117 Datasheet v2.03 TYP 3.37 2 930 1.2 6.15 830 VDDHI – 0.06 VDDHI – 0.06 1.5 MAX 3.6 6.5 1030 1.3 0.15VDD 6.5 900 UNIT V V mA µA V V V V mV V V V Page 44 of 50 February 2008 IQ Switch® ProxSense™ 10.3 Timing Characteristics DESCRIPTION (Table 10-2) SYMBOL HI Power Θ MED Power Θ LO Power Θ MIN Power Θ CFL Mode IQS1170C0 153.9 142.2 89.1 97.2 64.8 63.0 34.2 34.2 60.3 61.9 90 35 42 17.5 21 70 84 140 168 5 4.16 UNIT deg deg deg deg deg deg deg deg deg deg deg deg/s deg/s deg/s deg/s deg/s deg/s deg/s deg/s s s CONDITON AC Supply, Note 1 AC Supply, Note 2 AC Supply, Note 1 AC Supply, Note 2 AC Supply, Note 1 AC Supply, Note 2 AC Supply, Note 3 AC Supply, Note 4 AC Supply, Note 5 AC Supply, Note 6 AC Supply, Note 1 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 2.2 s 50Hz 1.83 s 60Hz 550 458 800 666 40 33 30 25 2 1.66 60 588 800 909 900 350 1700 1250 ms ms ms ms ms ms s s s s ms µs µs µs µs µs µs µs 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz Fast Slope SAA Slow Slope SAB Off Slope SOFF On Slope SON FITD Latch Time TLATCH Time between successive actuations TLIMIT Mode HI/ Continuous Dimming TSELECT Constant Power level TCONST User Feedback TFLASH Halt environment adjusting THALT Proximity Ignore Time TPROXIGNR SW De-bounce TSW PWRCNTR and LED pulse TBOOST Zero Cross Debounce TZCDB Charge Delay time after Zero Cross TCHARGE LED Flash frequency fLED_FLASH 16 Hz TG PWM Frequency fPWM 130 Hz Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Min Typ Max 12 Vac 220 Vac 12 Vac 220 Vac DC Mode Page 45 of 50 February 2008 IQ Switch® ProxSense™ 10.4 Defined Power Levels (For Resistive Loads) AC Power Levels HI Power MED Power LO Power MIN Power DC Power Levels HI Power MED Power LO Power MIN Power Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Table 10-3 % Power Transferred to Load IQS1170C0 98.1 93.6 49.0 57.2 23.7 34.1 4.2 15.5 19.8 34.1 Table 10-4 % Power Transferred to Load IQS1170C0 89.4 51.3 36.8 21.0 36.8 CONDITON Note 1 Note 2 Note 1 Note 2 Note 1 Note 2 Note 3 Note 4 Note 5 Note 6 CONDITON Note 3 Note 5 IQS1170xx00 – IQS1170xx15 IQS1171xx30 – IQS1171xx45 IQS1170xx01, IQS1170xx05, IQS1170xx07, IQS1170xx09, IQS1170xx13, IQS1170xx14, IQS1170xx15 IQS1171xx31, IQS1171xx35, IQS1171xx37, IQS1171xx39, IQS1171xx43, IQS1171xx44, IQS1171xx45 IQS1170xx00, IQS1170xx02, IQS1170xx04, IQS1170xx06, IQS1170xx08, IQS1170xx10, IQS1170xx11, IQS1170xx12 IQS1171xx30, IQS1171xx32, IQS1171xx34, IQS1171xx36, IQS1171xx38, IQS1171xx40, IQS1171xx41, IQS1171xx42 Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 46 of 50 February 2008 IQ Switch® ProxSense™ 10.5 Device Designator CONFIGURATION MODE (Table 8-1 and Table 8-2) 00 05 09 13 31 36 40 44 REVISION 0 1 = = Leading-edge Trailing-edge TEMPERATURE RANGE C = 0°C to 70°C (Commercial) PACKAGE SS = SSOP (Small Outline Package) 01 06 10 14 32 37 41 45 02 07 11 15 34 38 42 04 08 12 30 35 39 43 Example: IQS1170C005CSS = Leading-edge; User Interface Option 5; Commercial Temperature Range; SSOP Package Note: The device name for the IQS117 engineering samples is IQS117ENG The device name for the IQS117 pre-production samples is IQS117PPS Some devices may still obtain the previous name: IQS17 Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 47 of 50 February 2008 IQ Switch® ProxSense™ 10.6 Packaging Information 20 Pin SSOP Packaging Dimension A B C D E F G H I J K L M Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. Min Max 7.60 mm 8.00 mm 6.2 mm typ 5.20 mm 5.40 mm 7.05 mm 7.25 mm 0.3 mm typ 0.65 mm typ 1.43 mm 1.63 mm 0.10 mm 0.20 mm 1.25 mm typ 1.09 mm typ 0.80 mm 0.95 mm 4° typ 0.5 mm typ IQS117 Datasheet v2.03 Page 48 of 50 February 2008 IQ Switch® ProxSense™ Datasheet Revision History Version 1.10 This is a new document containing the production silicon parameters Version 1.11 • • • • • • Device Designator Example Corrected Updated TZCDB in Table 10-2 Fixed reference to D4 in section 5.4 Updated Data in Table 10-1 Updated section 7.2 Updated TBOOST in Table 10-2 Version 1.12 • • • • • Fixed D8 in Figure 5-5 Updated Chapter 4 Updated Table 8-1 Added Digital Input Voltages to Table 10-1 Updated section 6.3.2 Version 2.00 • Updated the document to include information on the trailing-edge devices (IQS1171xx 30 – IQS1171xx 45) Version 2.01 • Fixed Heading 5.6 Version 2.02 • • • • • • Updated Table 10-2, Table 10-3, Table 10-4, Table 8-1 and Table 8-2 Updated Section 4.3.2 Updated Chapter 6 Updated Section 8.1.2 Updated Section 8.2.5 Updated Section 10.5 Version 2.03 • Replaced IQS17 with IQS117 PRETORIA OFFICE Physical Address Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. 160 Witch Hazel Avenue st Hazel Court 1, 1 Floor IQS117 Datasheet v2.03 Page 49 of 50 February 2008 IQ Switch® ProxSense™ Highveld Techno Park Centurion, Gauteng Republic of South Africa Tel: Fax: Postal Address PO Box 16767 Lyttelton 0140 Republic of South Africa +27 12 665 2880 +27 12 665 2883 PAARL OFFICE Physical Address 109 Main Street Paarl 7646 Western Cape Republic of South Africa Tel: Fax: Postal Address PO Box 3534 Paarl 7620 Republic of South Africa +27 21 863 0033 +27 21 863 1512 WWW.AZOTEQ.COM [email protected] The following patents relate to the device or usage of the device: US 6,249,089 B1, US 6,621,225 B2, US 6,650,066 B2, US 6,952,084 B2, US 6,984,900 B1, US 7,084,526 B2, US 7,084,531 B2, EP 1 120 018 B1, EP 1 206 168 B1, EP 1 308 913 B1, EP 1 530 178 B1, HK 104 1401A, ZL 99 8 14357.X, AUS 761094 IQ Switch, ProxSense and the IQ logo are trademarks of Azoteq The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Azoteq assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Azoteq makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Azoteq products are not authorized for use as critical components in life support devices or systems. No licenses to patents are granted, implicitly or otherwise, under any intellectual property rights. Azoteq reserves the right to alter its products without prior notification. For the most up-todate information, please contact [email protected] or refer to the website. Copyright © Azoteq (Pty) Ltd 2007. All Rights Reserved. IQS117 Datasheet v2.03 Page 50 of 50 February 2008