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Dalhousie Heat Flow Probe
Hardware Reference Manual
Doc:ument #:1626 Version 1.0
January 10, 2000
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Prepared by:
AMIRD< Systems Inc.
77 Chain Lake Drive
Halifax, Nova Scotia
B3S lEI
Prepared for:
Department of Oceanography
Dalhousie
University
Halifax, Nova Scotia
B3H 4Jl
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Approved:
~~(1 ~'I
Project Manager -Brett Eskritt
AM~
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@ (2000) Dalhousie University. All rights reserved. The information
contained herein includes information which is confidential and
proprietary to Dalhousie University and may not be used or disclosed
without prior written consent of Dalhousie University.
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Revision Date Description of Revision 1.0 January 10, 2000 Initial
release
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Table of Contents
1. Introduction
2. Hardware Users Manual 2 2.1 Lower Board External Connections 2
2.1.1 Tilt Sensor Inputs 3 2.1.2 Thermistor Connections 4 2.1.3 Bridge Resistors 5
2.1.4 Lower Multiplexor Controls 6 2.1.5 Jog Detector Inputs 7
2.2 Upper Board External Connections 7 2.2.1 Heater Power Supply 8 2.2.2 Pinger Power
Supply 9 2.2.3 Pinger Connection 9 2.2.4 Isolated RS-232 10 2.2.5 Electronics Power
Supply 10 2.2.6 Heater Connection 11
2.3 Lower Board Jumper Settings 11 2.3.1 Analog to Digital Converter Microcontroller
Programming Jumpers 12 2.3.2 Audible Jog Detector Indicator 13
2.4 Upper Board Jumper Settings 13 2.4.1 Pinger Microcontroller Programming Jumpers
14 2.4.2 Pinger Frequency Select Jumpers 14
3. Hardware Reference 3.1 Introduction 15
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3.2 Thermistor Analog to Digital Conversion -Lower Board 15 3.2.1 Slew Rate Limiting
of Amplifiers 15 3.2.2 Offset Resistor Settings 17 3.2.3 Gain Resistor Settings 18 3.2.4
Balance Adjust 18
3.3 Voltage and Current Monitors -Upper Board 18 3.3.1 Heat Pulse Voltage Monitor 18
3.3.2 Heat Pulse Current Monitor 19 3.3.3 Heat Pulse Battery Pack Monitor 19 3.3.4
Pinger Battery Pack Monitor 20 3.3.5 Electronics Battery Pack 20 3.3.6 Isolated
Grounds 20
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4. Assembly Instructions 4.1 Upper Board Assembly 22 4.2 Upper Board ECO List 26 4.3
Upper Board Notes ; 28
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4.4 Lower Board Assembly 28 4.5 Lower Board ECD List 31 4.6 Lower Board Notes ""." ' '."'.'
'..' 32
Appendix A: Lower Board Original Schematics 33
Appendix B: Lower Board Revised Schematics 38
Appendix C: Upper Board Original Schematics 43
Appendix D: Upper Board Revised Schematics ,
Appendix E: Lower Board Bill of Materials 57
Appendix F: Upper Board Bill of Materials 60
Appendix G: Lower Board Assembly Drawings 64
Appendix H: Upper Board Assembly Drawings 67
Appendix I: Lower Board Mechanical Drawing 70
Appendix J: Upper Board Mechanical Drawing 72
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List of Tables
Table 2-1: Lower Board External Connector Description 2 Table 2-2: Tilt Sensor Signal Description "'.'
""."""""""'..."""""""""" 3 Table 2-3: Thermistor Signal Description ".".."."""."."'...'.' """"""'.'." 5 Table 2-4: Bridge
Resistor Connections 6 Table 2-5: Reference Resistor Connections 6 Table 2-6: Lower MUX Control Signals 7
Table 2-7: Jog Detector Signal Description 7 Table 2-8: Upper Board External Connector Description 8 Table 29: Heater Power Supply , 9 Table 2-10: Pinger Power Supply ".."'.'.'."".""'.""'.'.."""""""".'...' 9 Table 2-11: Pinger
Connection "." """ """""'."""." 9 Table 2-12: Serial Connections for PC DTE """""."".""""""""'.""""" 10 Table 213: Isolated RS-232 Signals 10 Table 2-14: Electronics Battery Pack '.""".".""""'..""."""""""""."""""" 10 Table 215: Heat Pulse Connection 11 Table 2-16: 2-Pin Jumpers Associated with Programming the ADC
Microcontroller .'..' ' """"'..' 12 Table 2-17: 3-Pin Jumpers Associated with Programming the ADC
Microcontroller 13 Table 2-18: Audible Jog Detector Indicator 13 Table 2-19: 2-PinJumpers Associated with
Programming the Pinger Microcontroller 14 Table 2-20: 3-Pin Jumpers Associated with Programming the Pinger
Microcontroller 14 Table 2-21: Pinger Frequency Selection 14 Table 3-1: Input Range versus Offset Setting 18
Figure 1-1: Heat Flow Probe Board Stack 1 Figure 2-1: Lower Board External Connector Location 2 Figure 2-2:
Configuration of Combination Thermistor/Reference Channels 4 Figure 2-3: Upper Board External Connector
Location 8 Figure 2-4: Lower Board Jumper Location 11 Figure 2-5: Upper Board Jumper Location , 13 Figure
3-1: Thermistor Analog Section 15 Figure 3-2: Effect of Amplifier Slew Rate Limiting , 16 Figure 3-3:
Nonlinearity Error 17
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DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
January 10, 2000
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1. Introduction
The Heat Flow Probe (HFP) was developed by AMIRIX Systems for the Department of Oceanography at
Dalhousie University. The HFP was based on a previous design developed at the Department of Oceanography.
The previous HFPs were lost at sea. The new design was reconstructed from the documentation available.
The HFP consists of a 4-board stack as shown in Figure 1-1. Two of the boards were manufactured by AMIRD<
Systems and two of the boards were purchased from third parties. The Tattletale Module was purchased from
Onset Computer Corporation. The Tattletale FLASH Module was purchased from Peripheral Issues. The two
boards developed by AMIRIX Systems are referred to as the Upper Board and the Lower Board. The Lower
Board contains all of the high precision analog circuitry associated with the thermistors. The Upper Board
contains all of the power electronics.
Figure 1-1: Heat Flow Probe Board Stack
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This document includes a Hardware Users Manual, a Hardware Reference, and Assembly Instructions for the
two boards. The Hardware Users Manual discusses all of the external connectors and the jumpers. This section
should aid the user in assembling the completed unit. The Hardware Reference highlights the changes in the
Hardware from the Conceptual Design Document (DN1518). The Conceptual Design Document contains the
majority of the detailed design information. The Assembly Instructions contain the information required to build
additional units. The Appendices include the schematics, the assembly drawings and the bill of materials that
would be required to build additional units.
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DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
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2. Hardware Users Manual
2.1 Lower Board External Connections
The connectors on the lower board are shown in Figure 2-1.
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/11..Jl 1~I
'f..J5 I ~--
..Jl. "..J5
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TPll
0
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TP2
0
TPl
/
0
\.
""'"
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TPB
0
\\
0
0
TP1't
\
TP12
TP10
0
TP13
TP9
0
0
/
/
/
.--/
" "'- "'""--'- 0[=~~~ J~
Figure 2-1: Lower Board External Connector Location
The function of each of the connectors is shown in Table 2-1. A detailed description of each of
the connectors is presented in the following sections.
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Table 2-1: Lower Board External Connector Description
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2.1.1 Tilt Sensor Inputs
The pinout of the tilt sensor connector (lower board -J1) is shown in Table 2-2. This interface
connects to two tilt cells such as the Accustar Electronic Clinometer with a ratiometric output.
The lower board supplies a +5 volt reference and a ground signal. The sensors output a voltage
that is a fraction of the +5 volts supplied to it. The ratio of the output voltage to the reference
voltage is proportional to the angle of inclination. At an inclination of 0 degrees the tilt cells
output a voltage of 2.5 volts. The tilt cells output a voltage of 3.5 volts at an angle of +60
degrees and 1.5 volts at an angle of -60 degrees. This translates to a gain of 16.67 m V / degree.
The equation describing the voltage at the input of the board with a 5-volt reference is shown
below.
V,ill_inpU, = 0.01667 * Angle + 2.5
(volts/ degree)
Equation 1
The voltages are buffered by non-inverting buffers before being sampled by the
analog to digital converters on the Tattletale. The X-axis and Y-axis non-inverting
buffers have a gain of 1.169 V IV. Therefore the nominal gain from sensor to
Tattletale input is 19.4833 m V I degree. The equation describing the voltage at the
input of the analog to digital converter is shown below.
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Vtilt_atod = 0.0194833 * Angle + 2.9225
(volts/degree)
Table 2-2: Tilt Sensor Signal Description
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Equation 2
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DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
January 10, 2000
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2.1.2 Thermistor Connections
The pinout of the thermistor connector (lower board -15) is shown in Table 2-3. This connector
is where the thermistor elements are connected. There are 9 regular thermistor channels and 4
combination thermistor/reference channels. To use the regular thermistor channels a thermistor
element should be connected between one of the thermistor pins (J5 -pins 1 to 9) and the
feedback voltage (J5 -Pin 14). As an example thermistor 1 should be connected between pin 1
and pin 14, thermistor 2 between pin 2 and pin 14 up to thermistor 9 which is between pin 9
and pin 14. To use the combination thermistor/reference channels as thermistors resistors R42,
R43, R44, R45 should be removed. Four additional thermistors can then be attached between
the thermistor pins (J5 -pins 10 to 13) and the feedback voltage (J5 -Pin 14). To use the
combination thermistor/reference channels as reference channels R42, R43, R44, R45 would
be populated forming the lower half of the resistive divider. Both configurations are illustrated
in Figure 2-2.
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REFERENCE CONRGURATION
V-
--;jJJ
IJ248
bJ5 Ptn 10 ~,~PW111
J5P.,12
J5 Pin
R42
J5 PIn '4
Voe
Figure 2-2: Configuration of Combination Thermistor/Reference Channels
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DN: 1626 -Dalhousie Hea't Flow Probe Hardware Reference Manual V1.0
Reference Designator
and Pin Number
JS-Pin
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JS-Pin2
JS-Pin3 )SPin4
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IS-
PinS Js Pin 6 JS Pin 7 JS Pin 8 JSPin9
rs -Pin 10 rs
-Pin 11 fS Pin 12 fS -
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Pin 13 rSPin14
January 10, 2000
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Description
Signal Direction with
ReSDect to Instrument
Input
~
Input
Input
Input
Input
Input
Input
~
Input
Input
Input
Input
Output
Thermistor 1
Thermistor 2
Thermistor 3
Thermistor 4
Thermistor 5
Thermistor 6
Thermistor 7
Thermistor 8
Thermistor 9
Thermistor la/Reference 4
Thermistor II/Reference 5(-<{
/rJu
I Thermis~/Reference 6 f... k "lJ
Thermistor 13/Refer~~~,,;<.. k,
Feedback V oltage (V~l
Table 2-3: Thermistor Signal Description
2.1.3 Bridge Resistors
One arm of the resistor bridge is formed with a thermistor (connected to JS) and a bridge
resistor (connected between J20 to J21 or J22 to J24). The bridge resistors (referred to as Rbr)
are intended to be easily changeable so that a different set of bridge resistors can be used for
every thermistor string. The resistors should be soldered to the forked terminal blocks which
mate to the connectors (120 to J21 or J22 to J24). The connections required to complete the
resistive bridge are shown in Table 2-4.
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DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
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Table 2-4: Bridge Resistor Connections
The reference resistive dividers are also populated using the same forked terminal and DIP
socket combination. For the reference resistive dividers a fixed resistor is used instead of a
thermistor. A bridge resistor is also required to complete that arm of the bridge.
Reference
Resistor
Refl
Ref2
Ref3
Header Connection
J22F to J24F
J22G to J24G
J22H toT24H
Bridge Resistor
Rbr14
Rbr15
Rbr16
Connection
J22C to J24C
J220 to J240
J22E to J24E
Table 2-5: Reference Resistor Connections
2.1.4 Lower Multiplexor Controls
The pinout of the lower multiplexor (MUX) control connector (lower board -J6) is shown in
Table 2-6. This connector is intended to connect to the MUX in the lower unit. The additional
MUX signals (MUX4 and MUX5) would increase the total number of possible thermistors to
52. The +12 V, -12 V and +5 V supplies are intended to power the MUX in the lower unit. The
MUX signals are driven by a 74LSO4 inverting buffer. These output signals have TTL logic
levels.
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Table 2-6: Lower MUX Control Signals
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2.1.5 Jog Detector Inputs
The pinout of the jog detector connector (lower board -J7) is shown in Table 2-7. This
connector is intended to interface to a traditional geophone. The gain required to trigger a jog
can be adjusted with potentiometer R56. To aid in tuning the gain the audible jog detect
jumper 08) can be populated. The buzzer will ring for a fixed period of time every time the
JOG signal is asserted.
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Table 2-7: Jog Detector Signal Description
2.2 Upper Board External Connections
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The connectors on the upper board are shown in Figure 2-3.
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DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
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January 10, 2000
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8
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\
/
'\
~""
""
""
~0 /
,/
/
/
Figure 2-3: Upper Board External Connector Location
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The function of each of the connectors is shown in Table 2-8. A detailed description of each of
the connectors is presented in the following sections.
Table 2-8: Upper Board External Connector Description
2.2.1 Heater Power Supply
The pinout of the heater power supply (upper board -}8) is shown in Table 2-9. This connector
is intended to interface to the battery pack for the high power heat pulse electronics. This
battery pack should be 28 volts. The heat pulse circuitry can handle up to 20 amps.
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Table 2-9: Heater Power Supply
2.2.2 Pinger Power Supply
The pinout of the pinger power supply (upper board -J4) is shown in Table 2-10. This
connector is intended to interface to the battery pack for the pinger electronics. This battery
pack should be 36 volts. The maximum output power of the pinger is 50 watts RMS. Assuming
an efficiency of 95%, the current draw from the battery would be approximately 1.5 amps.
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Table 2-10: PinKer Power Supply
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2.2.3 Pinger Connection
The pinout for the pinger (upper board -J5) is shown in Table 2-11. This connector is intended
to interface to the ITC-3013 transponder. The two terminals connect directly to the transformer
and inductor. The pins were arbitrarily labeled the positive and negative terminal. The
orientation of these signals can be either way.
Reference
Designator and
Pin Number
TS-Pint
Description
Signal Direction with
Respect to Instrument
Output
Output
Positive Terminal
Negative Terminal
Table 2-11: Pinger Connection
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2.2.4 Isolated RS-232
The pinout for the RS-232 connector (upper board -J7) is shown in Table 2-13. A cable can be
made to connect the serial port of a standard PC to this device. The connections required for a
25-pin and a 9 pin PC serial port (usually a DTE device) are shown in Table 2-12. For example
a PC with a 9 pin serial port should have the TXD signal on pin 3, the RXD signal on pin 2 and
the ground signal on pin 5. The TXD, RXD and GND signals on the PC serial port connect to
ISO_TXD2, ISO_RXD and GND respectively on the HFP serial port.
Table 2-12: Serial Connections for PC DTE
Reference
Designator and
Pin Number
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Description
Signal Direction with
Respect to Instrument
Input
]7-Pinl
]7-Pin2
Output
T7-Pin3
Invut
RS-232 Input Signal aSO_TXD2)
R5-232 Output Signal (ISO_RXD2)
Ground
Table 2-13: Isolated RS-232 Signals
2.2.5 Electronics Power Supply
The pinout of the electronics power supply (upper board -Jl) is shown in Table 2-14. This
connector is intended to interface to the electronics battery pack. This battery pack should
nominally be 18 volts. The DC to DC converter that runs off this battery pack will operate
properly on an input voltage ranging from 9 volts to 18 volts.
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Table 2-14: Electronics Battery Pack
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DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
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2.2.6 Heater Connection
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The pinout for the heater (upper board -J9) is shown in Table 2-15. The load resistor is
connected across this connector. The 4-pin connector should be used as a Kelvin connection.
The high current leads of the load should be connected to pin 1 and pin 4. The sense leads
should be connected to pins 2 and 3.
Reference
Designator and
Pin Number
~
J9 -Pin 1
J9
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+ Heat Pulse
+ Sense CoImection Sense CoImection Heat Pulse
~~
:Pin2
J9-Pin3
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Description
Signal Direction with
Respect to Instrument
Outout
T9-Pin4
Table 2-15: Heat Pulse Connection
2.3 Lower Board Jumper Settings
The jumpers on the lower board are shown in Figure 2-4. The purpose of these jumpers is
discussed in the following sections.
/
'""'"
/
/
/
/
\
\
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\
\
.J8
CJ
\
\
\
~o
~
"""
" "
"
/
~
I~
,/
/
~
/'
Figure 2-4: Lo,ver Board Jumper Location
,/\MIRiX
/
/
/
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DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
January 10, 2000
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2.3.1 Analog to Digital Converte r Microcontroller Programming Jumpers
The majority of the jumpers are associated with programming the 89C51 microcontrollers. In
the operational mode the serial communication lines (RXD and TXD) are used to communicate
with the Tattletale8. These signals have an alternate function when in the In System
Programmable (ISP) mode. In the ISP mode the serial communication lines are used to
communicate program data. The jumpers (JP3, JP4) need to be populated for normal operation.
To program the device the jumpers should be removed and then the serial communication
(RXD and TXD) can be driven via J23. The programming header J23 can be connected to a PC
serial port with an RS-232 to 1TL converter. The device can then be reprogrammed with the
appropriate software. The jumper configuration for both modes of operation are described in
Table 2-16.
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On reset of the device the 89C51 samples the status of the PSEN signal. If this signal is high
(or not connected) the device branches to address OxOOOO where the normal operation
application code exists. If this signal is tied low the device branches to address OxFCOO
where the ISP boot loader exists. To issue a reset to the device the JP2 jumper can be removed
and the pushbutton pressed.
The 89C51 device is a FLASH based part. In order to program the FLASH a 12-volt supply is
required. To program the device the EA/Vpp signal 04 -Pin 2) must be connected the 12-volt
supply 04 -Pin 1). For normal operation the EA/Vpp signal 04 -Pin 2) must be connected to the
S-volt supply 04 -Pin 3). The EA/Vpp signal 04 -Pin 2) should not be left open. If the pin
floats low then the device may attempt to fetch code from external memory (which does not
exist). The jumper configuration for both modes of operation are described in Table 2-17.
Designator I Description
Populated
Not Populated
Pushbutton
Controlled
Programming mode
JP2
ADC Microcontroller
Reset Selection
n'8 Controlled
JP3
AOC Microcontroller
RXD Connection
JP4
ADC Microcontroller
TXD Connection
JPS
AOC Microcontroller
Normal
operational
mode
Normal
operational
mode
Programming
mode
PSEN
Programming mode
Normal operational
mode
Table 2-16: 2-Pin Jumpers Associated with Programming the ADC Microcontroller
AM~
Desip;nator -,~!!pt~on
J4
AOC Microcontroller
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January 10, 2000
DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
Pin 1 to Pin 2
Pin 3 to Pin 2
Programming
mode
Normal operational
mode
Table 2-17: 3-Pin Jumpers Associated with Programming the ADC Microcontroller
2.3.2 Audible Jog Detector lndic ator
The piezoelectric buzzer is intended to aid the adjustment of the gain in the jog detector
circuitry. The Audible Jog Detector Enable jumper can be populated to enable the buzzer. For
normal operation this jumper should be removed.
Oesi ator Oescri Po ulated Not Po ulated
J8 Audib Detector Enable Enabled Disabled
Table 2-18: Audible Jog Detector Indicator
2.4 Upper Board Jumper Settings
The jumpers on the upper board are shown in Figure 2-5. The purpose of these jumpers is
discussed in the following sections.
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,
r=J.a
§~
/
\
~
/
""
'"'"
/
/
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/'
~ --'"
Figure 2-5: Upper Board Jumper Location
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DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
!anUllry 10, 2000
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2.4.1 Pinger Microcontroller Programming Jumpers
For a description of these jumpers in Table 2-19 and Table 2-20 refer to Section 2.3.1. The
jumpers used by the pinger microcontrolIer are similar in function to the jumpers used on the
analog to digital converter microcontrolIer
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Populated
Designator I Description
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JPl
JP2
JP3
JP4
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Pinger Microcontroller 1T8 Controlled
Reset Selection
Normal
Pinger Microcontroller
operational
RXD Connection
mode
Pinger Microcontroller Normal
operational
TXD Connection
mode
Pinger Microcontroller Programming
mode
PSEN
Not PoDulated
Pushbutton
Controlled
Programming mode
Programming mode
Normal operational
mode
Table 2-19: 2-Pin Jumpers Associated with Programming the Pinger Microcontroller
Desienator I Description
J3
PinltoPin2
Pinger Microcontroller Programming
mode
Pin 3 to Pin 2 Normal
operational mode
Table 2-20: 3-Pin Jumpers Associated with Programming the Pinger Microcontroller
2.4.2 Pinger Frequency Select Jum pers
The remaining three jumpers UP8, JP7, JP6) select the frequency of the pinger.
Pinger Frequency
Pin2er FreQuency Select Jumpers
IPS
populated
populated
populated
populated
unpopulated
unpopulated
unpopulated
unDoDulated
JP7
populated
populated
unpopulated
unpopulated
populated
populated
unpopulated
unpopulated
JP6
populated
unpopulated
Eopulated
unpopulated
populated
unpopula!ed
populated
unDopul~ed
(kHz)
5.9956
7.9942
9.0066
9.9879
11.000
0
11.991
3
13.012
Table 2-21: Pinger Frequency Selection
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3. Hardware Reference
3.1 Introduction
This section is not intended to be a complete hardware reference that covers all aspects of this
design. A lot of the detail has already been captured in the Conceptual Design Document
(DN:1518). This section will highlight any differences from the Conceptual Design Document.
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3.2 Thermistor Analog to Digit al Conversion -Lower Board
3.2.1 Slew Rate Limiting of Amp lifiers
One problem associated with the switched DC bridge technique is the slew rate limiting of the
operational amplifiers. The simplified schematic of the analog thermistor section is shown in
Figure 3-1. This is a copy of the schematic that was shown in the conceptual design document
and has been included here for reference purposes. Recall that the bridge is exciting by an
alternating +5 volt -5 volt square wave. The amplifiers A1, A2, A3, A4 all experience slew rate
limiting. Precision amplifiers were chosen for their low offset voltage drift versus temperature.
Unfortunately precision amplifiers typically do not have fast output stages causing rather poor
slew rate limiting.
Figure 3-1: Thennistor Analog Section
DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
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January 10, 2000
The result of the slew rate limiting can be observed at the input to the voltage to frequency
converter. Ideally this voltage should be a constant DC voltage. The actual voltage is shown in
Figure 3-2 indicated as U4-1. From a performance point of view this effect seems to manifest
itself as a nonlinearity. The nonlinearity of the measurement improves if the bridge is fixed at a
constant 5 volt excitation. The nonlinearity appears to increase as the number of bridge
reversals (number of CLK_RMS cycles) is increased.
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CD
0.00 V
7.10 V
2. OO}ls
179}ls
u6-6
;_.+-..; ! ;-..;...+-+-!"-.; ;.+t-++.++~.;-+++-:
8-
u4--1
.-1-'._.; J I._.I...J I , ,...J ; ...'-J...';'_.'_..' ' I-'-1 ' -J , , , L.; , L..-, L.I.-.' , 1
Ch1 5.00 V ew- 5.00 V M 100).15 A Ch2 '\. 1.30 V
0-+'" 177.400]JS
7 SeD 1999
06:43: 16
Figure 3-2: Effect of Amplifier Slew Rate Limiting
In an attempt to reduce the nonlinearity, a schottkey diode was added between pin 7 on the
VtoF converter (5 VIN) and ground. This did improve the nonlinearity slightly but this is still
not as good as with a fixed DC bridge excitation. The nonlinearity is shown in Figure 3-3 for
three different test cases. The normal operation is shown as the "No Cap" trace. The operation
with a fixed DC bridge excitation is shown as the trace labeled "No RMS". The normal
operation with the diode connected to pin 7
(5 VIN) on the VtoF is shown as the trace labeled "Diode".
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DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
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In conclusion, the majority of the nonlinearity is due to the switching of the bridge. The
addition of the diode improves the situation slightly. The slight improvement was not
considered enough to warrant modifying the design to include the diode. The nonlinearity can
be decreased by reducing the number of bridge switches within a measurement.
Residuals
400
~
300
-200 0
-
No Cap -+Eo-
Diode
--No RMS
c
~ 100
0
(.)
-0
"'(ij
~
'C -100
~
0
~ -200
-300
-400
1.8
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1.9
2
2.1 2.2 2.3 2.4
Resistance (kOhm)
2.5
2.
6
2.
7
Figure 3-3: Nonlinearity Error
3.2.2 Offset Resistor Settings
The Tattletale controls the input range used for the thermistor measurements. The offset
selected can range from 0 to 7. The offset setting determines the parallel combination of
resistors (R15, R16, R17, R18 on the lower board) used for the offset resistor. The offset
resistor (often referred to as Ro in Dalhousie documentation) is one of the resistors in the nonthermistor arm of the bridge. The offset resistor determines the balanced operating point of the
bridge. The input range for each of the offset settings is shown in Table 3-1. PSPICE
simulations were used to determine the upper and lower limits of the range. Actual values will
vary from these values. In the table the " j j" indicates the parallel combination of resistors.
~M~
DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
January 10, 2000
18
I
Table 3-1: Input Range versus Offset Setting
I
3.2.3 Gain Resistor Settings
The gain of this bridge circuit is determined by the amount of feedback around the bridge. The
amount of feedback is set by a resistive divider consisting of R20 and R22. The Tattletale can
change the gain by switching a resistor, R19, in parallel with
R20.
The current Heat Flow Probe configuration does not populate R19. There was not a specified
gain for the second gain setting therefore a resistor value could not be determined. This
functionality existed in the original design and was not deleted in the new design. If in practice
gain changes are required then this resistor can be populated appropriately.
3.2.4 Balance Adjust
To reconstruct a steady positive voltage, at the input of the VtoF, from the alternating DC Bridge an
inverter amplifier is required. The MUX (U4) alternately selects the inverting and then the noninverting
path to reconstruct a DC voltage. The potentiometer (RIO) in the inverting path is used to null out the
offset associated with this inverting amplifier stage.
3.3 Voltage and Current Monit orB -Upper Board
I
3.3.1 Heat Pulse Voltage Monito r
The voltage across the heater is used to calculate the power delivered to the load. The voltage
across the load is scaled by a resistive divider consisting of R26 and R27. This scaled voltage
is then passed through an instrumentation amplifier with a gain of unity. The total gain from
voltage across the heater coil to the voltage at the Tattletale input is given below.
DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
January 10, 2000
(volts/volt)
19
Equation 3
The input range of the Tattletale's analog to digital converters is from OV to 4.096V. Given
this range the heat pulse voltage monitor will operate properly with inputs ranging from OV to
24.576V
3.3.2 Heat Pulse Current Monitor
The current through the heater coil is sensed with a 0.01 Ohm current sense resistor
(R31). The voltage across this resistor is amplified by an instrumentation amplifier
(U13) with a gain of 10. The transfer function from the current through the heater coil
to the voltage at the Tattletale input is given below.
Gain =0.01*
100000
R32
=0.1
(volts/amp)
Equation 4
The input range of the Tattletale's analog to digital converters is from OV to 4.096V.
Given this range the heat pulse current monitor will operate properly with inputs
ranging from 0 amps to 40.96 amps.
3.3.3 Heat Pulse Battery Pack Monitor
The voltage at the heat pulse battery pack is used to determine when the battery pack
is nearly depleted. The voltage at the battery pack is scaled by a resistive divider
consisting of R22 and R23. This scaled voltage is then passed through an
instrumentation amplifier with a gain of unity. The total gain from voltage across the
heater coil to the voltage at the Tattletale input is given below.
(volts/volt)
Equation 5
This voltage monitor should return the same value as the heat pulse voltage monitor
when the heat pulse is active. When the heat pulse is inactive this voltage monitor
reads the actual voltage on the battery pack while the heat pulse voltage monitor will
be pulled low.
I
The input range of the Tattletale's analog to digital converters is from OV to 4.096V. Given
this range the heat pulse voltage monitor will operate properly with inputs ranging from OV to
24.576V.
DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
January 10, 2000
20
3.3.4 Pinger Battery Pack Monito r
The voltage at the pinger battery pack is used to determine when the battery pack is nearly
depleted. The voltage at the battery pack is scaled by a resistive divider consisting of R22 and
R23. This scaled voltage is then passed through an instrumentation amplifier with a gain of
unity. The total gain from voltage across the heater coil to the voltage at the Tattletale input is
given below.
(volts / volt)
I
Equation 6
The input range of the Tattletale's analog to digital converters is from OV to 4.096V. Given
this range the pinger battery pack monitor will operate properly with inputs ranging from OV
to 35.6037V
3.3.5 Electronics Battery Pack
The voltage at the electronics battery pack is used to determine when the battery pack is nearly
depleted. The voltage at the battery pack is scaled by a resistive divider consisting of R3 and
R4. This scaled voltage is then passed through a noninverting operation amplifier stage with a
gain of 2.05 V IV. The total gain from voltage across the heater coil to the voltage at the
Tattletale input is given below.
= 0.235841
(volts/volt)
Equation 7
The input range of the Tattletale's analog to digital converters is from OV to 4.096V.
Given this range the electronics battery inputs pack monitor will operate properly with
ranging from OV to 17.3676V.
3.3.6 Isolated Grounds
The ground reference for the heat pulse battery pack and the pinger battery pack are isolated
from the ground reference for the electronics battery pack on the boards. The instrumentation
amplifiers (used by the monitors) are used to bridge the two ground references. However the
instrumentation amplifiers do require a resistive connection between the grounds. There are two
resistors (R33 and R20 on the upper board) that provide this resistive connection. These
resistors are currently populated with 100 Ohm resistors. If the grounds for each of the battery
packs are common then these resistors can be removed to eliminate any possibilities of ground
loops.
DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual Vl.0 January 10, 2000 21
4. Assembly Instructions
This document describes the assembly instructions for the Dalhousie Heat Flow Probe. This unit consists of two
boards: the upper board and the lower board. The assembly instructions have been organized into three sections
the assembly instructions, the ECO list and assembly notes. The assembly instructions deal with any components
that are unaffected by any ECO changes. If a component was changed due to an ECO it would have been
removed from the assembly instruction section and a new instruction added to the ECO list.
I
The following documentation is relevant to these assembly notes. For each of the boards there are two
appendices containing schematics. The Original Schematics were used to layout the board. The
Revised Schematics contain all the ECO's and component changes backannotated onto the schematic.
~
.
I
i
I
I
I
Lower Board
Original Schematics
Revised Schematics
Bill of Materials
Assembly
Drawings
Mechanical Drawing
SCH-OO211O-Q1
SCH-OD2110-D2
BOM-DO2114-D2
MECH-OO2116-01
MECH-OO2249-D1
Appendix
Appendix
Appendix
Appendix
Appendix I
Upper Board
Original Schematics
Revised Schematics
Bill of Materials
Assembly Drawings
Mechanical Drawing
SCH-OO2109-01
SCH-OO2109-D2
BOM-DO2113-D2
MECH-OO211S-DI
MECH-DO2249-DI
Appendix C
Appendix D
Appendix F
Appendix H
Appendix J
A
B
E
G
January 10, 2000
DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
22
4.1 Upper Board Assembly
1. Populate the following components.
Qty.
Reference
Desianator
9
C1, C2, C4,
AM Part
Manufacturer Part
Number
Number
2885
ECS- T1 ED226R
Description
Manufacturer
Panasonic
22uf Tantalum SMT
Cap
C5, C6, C40,
C41, C42, C43
16
C3, C7, C8, I
2886
ECJ-1VF1 E104Z
Panasonic
C9, C11,
I
C12,
C13,
C14,
C16,
C17,
C22,
C23,
C24,
C25,
C26,
.1uF, 25VDC Cap,
0603
C27
1
C10
2992
PCS31 06CT -NO
Panasonic
10uF Tanatalum,
3528
I
1
C15
2964
C18, C19,
2840
ECE-A 1JGE471
Panasonic
Electrolytic Capacitor,
470uF,63V
3
ECS- T1EY105R
Panasonic
volts
C20
C21
1 uF Tantalum Cap, 25
2841
ECS-T1CY475R
2994
8130DICT -ND
I Panasonic
4.7uF Tantalum Cap,
16 volts
1
I D1
IR
Schottkey, SMA,
30 amps
3
02,03,04
4232
BAS16
ROHM
Switching Diode
6
F1, F2, F3
2862
122088
Littelfuse
Fuse Clips, PCB
5
1501, 1502,
2819
PS2701-1NEC-ND I NEC
2930
PZCO2SMN
Sullins
Jumper, 2 Pins
5760
TSW-105-08-G-D-
Samtec
2x5 Right Angle
Mount
Optical Coupler, SO4
1503,1504,
1505
7
JP1. JP2.
JP3, JP4.
JP6. JP7,
JP8
IJP5
RA
terminal strip
3
J4. J5, J8
2905
277-1027-ND
Phoenix
1
J3
2931
PZCO3SAAN
Sullins
2 Pin 5.08mm Screw
Terminal
.l\:M~
Jumper, 3 Pins, G~
DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
Oty.
Reference
Desianator
1
J6
J7
AM Part
Manufacturer Part
2865
Manufacturer
Description
Number
Number
5682
January 10, 2000
SSW-108-01-G-D
Samtec
1803439
Phoenix
1
20 socket dual row
connector
1
3 contact Connector
header, Vertical,
3.81mm
1
1
J22
2966
640457-4
AMP
J9
2920
277-1249-ND
Phoenix
PZ1
2852
AI-175
Projects
640457--4 Right
An Ie Connector
4 position 5.08 mm
Screw Terminal
Sub miniature Piezo
Unlimited
Audio Indicator
2
01,03
2820
MTP4N50E
4
02, 04, OS,
2814
MMBT2222L T1
6006
P1MOACT-ND
Panasonic
1M, 5%, 0805
R2
6015
P10K5CCT-ND
Panasonic
10.5K, 1%,0805
RS, R6, R8,
3010
P10KOCCT -ND
Panasonic
10K, 1%,0805
4490
P100KCCT-ND
Panasonic
100K, 1%,0805
6008
P3K9ACT -NO
Panasonic
R21
4900
PORECT -ND
R31
2821
MP916-.01
07
3
R1, R68,
Motorola
Power FET
Motorola
NPN Transistor
R69
4
R32
7
R3, R7, R10,
R22, R2S,
R26, R29
3
R13, R19,
! 3.9K, 5%, 0805
R28
I
1
1
R30
N/A
1
R24
N/A
3
R15, R16,
N/A
P391
OR, 5%, 1206
I Panasonic
I
.01 ohm Precision
I Caddock
Power Resistor
ECT-ND
Panasonic
P102VCT-ND
Panasonic
P512ACT -ND
Panasonic
N/A
P681 ECT -ND
Panasonic
N/A
P222ECT
Panasonic
N/A
P133CCT-ND
Panasonic
N/A
P203CCT -ND
Panasonic
1428
RM782AT151J
KOA
2842
EVQ-QHVO2W
Panasonic
i 390, 5%, 1206 11K,
5%, 1210
I
I 5.1K. 5%, 0805
I
R17
I
2
R11, R14
2
R12, R18
2
R4, R9
2
R23, R27
2
R20, R33
51
1
T2
U2
i 680, 5%, 1206
-ND
2.2K, 5%,1206
13K, 1%,0805
20K, 1%,0805
100,5%,0805
Pushbutton Switch,
SMT
Transformer
2816
67117970
Schott Corp.
2892
LM2904M-ND
National
Dual Low Power
CD-amp
23
DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
January 10, 2000
I
2. Populate the terminal plugs so the notch points into the board. This ensures that the wires
are oriented off the board instead of over the top of the board.
Qty. Reference
Desianator
1
J1
J'M Part
Manufacturer Part
Number
Number
2866
1803426
Manufacturer
Phoenix
Description
2 contact Connector
header, Vertical,
3.81mm
1
J7
2865
1803439
Phoenix
3 contact Connector
header, Vertical,
3.81mm
3. Populate the fuse holders.
I
I
AMI~
24
4. Assemble and attach the POT cores.
Qty.
Reference
AM Part
Manufacturer Part
Designator
Number
L1
2882
Manufacturer
Description
Number
991-193-00
Philips Magnetics
2883
991-199-00
Philips Magnetics
2884
991-191-00
2880
3622PA275-3C81
Terminal Plate for
36x22 core
1
Brass Cover for
36x22 core
_~hil!ps Magnetics I Spring for 36x22 core
Philips Magnetics
Pot Core, 36><22,
Gapped, 3C81
1
5686
3622F1D
Philips Magnetics
Bobbin
2882
991-193-00
Philips Magnetics
Terminal Plate for
1
2883
991-199-00
Philips Magnetics
1
2884
991-191-00
36x22 core
Philips Maanetics I Sprina for 36x22 core
1
2881
3622PLOO-3C81
Philips Magnetics
1
5686
3622F1D
Philips Maanetics I Bobbin
1
T1
36x22 core
I
Brass Cover for
Pot Core, 36x22,
UNGaDDed. 3C81
5. Populate the jumpers.
Reference Designator I Status
~
Populate
Populate
PoDulate
.TP2
JP3
Povulate Pin 2 to Pin 3
I
I
I
I
AM~
DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
January 10, 2000
26
6. Populate Q6. Bolt the transistor to the board with the machine screw and nut. Populate the
DC to DC converter (U3). It is important to note that the DC to DC converter must be
populated after the transistor is bolted down. The head of the screw is counter sunk under
the DC to DC converter.
4.2 Upper Board ECO List
1. Connect U1 pin 57 to +5V. The ECO must be attached to the Tattletale footprint so
that it does not interfere with the Squishy bus connector. The pullup resistor R1 is
attached to +5V. This may be the most convenient place to attach the ECO wire to.
2. The serial communication lines between the TattleTale and the two 8051s are not crossed
on the board (TXD goes to TXD and RXD goes to RXD). Therefore, the traces connected
to pin 18 and pin 19 on the Tattletale pad need to be cut before the first via and crossed
using wire.
3. On the original schematics and board, REFADJ (pin 99) is connected to VREG (pin 110) on
the TattleTale. This connection needs to be broken. The trace from pin 99 can be cut
before it hits the first via underneath the TattleTale.
4. Before attaching the Tattletale, check that the Tattletale's step down DC/DC converter
(LTCl174) is configured to supply 600mA. Pin 7 (Ipgm) should be lifted from its pad and
connected to pin 6 (Vin). All of the hardware to attach the Tattletale and Persistor FLASH
card to the Upper Board should be included with the Tattletale.
I
5. Two pull-up resistors are required on the emitters of the two optocouplers used in the
isolated RS232 driver circuit. On U9 (MAX250CPD) connect pin 10 (RIIN) to pin 14
(YCC) using a lK resistor. Instead of using pin 14, the positive side of capacitor C20 may
be used. On UI0 (MAX251CPD) connect pin 3 (TIIN) to pin 7 (BYPASS) using a lK
resistor. Instead of using pin 7, the positive side of capacitor C21 may be used. Both
resistors could possibly be mounted underneath the sockets for U9 and UI0.
Qty.
Reference
Designator
2
R70, R71
AM Part
Manufacturer Part
Number
5834
Manufacturer
Description
Number CFR12JR1KO
Yaego
10K leaded 1/8W
resistor
6. Populate the sockets for U9, UlO.
Qty.
-
Reference
AM Part
Manufacturer Part
Desianator
Number
U9
2871
Manufacturer
Description
AR14-HZL
Assmann
14 pin Machined IC
AR14-HZL
Assmann
14 pin Machined IC
1
Sockets
1
U10
2871
Sockets
7.
I
Populate the socketed RS232 parts.
8. The SHUTDOWN signal on U9 (MAX250CPD) was originally intended to be controlled
by the TattleTale. However, we cannot guarantee this port line to be set properly when
running the TattleTale in PicoDOS or other debugging tools. Hence, we may loose
communication with the unit. Therefore, pin 1 on U9 needs to be connected to ground and
disconnected from the signal line by either lifting the pin, or cutting the trace. Pin 1 can be
connected to the positive side of C6 to be grounded. It may possible to put this ECO under
the socket to improve the appearance of this ECO.
A:fiii,~
4.3 Upper Board Notes
1. The footprint for 06 (89C51RC) appears to be incorrect. The leads on the device are
longer than the pads, which may cause some problems when soldering the device. This
should be corrected if the board is laid out again.
2. The silkscreen labels for resistors R23 and R33 are interchanged on the actual board
layout. Therefore, the slot marked R33 needs to be populated with R23 and the slot
marked R23 needs to be populated with R33. Check the assembly diagram. Do not trust
the silkscreen.
4.4 Lower Board Assembly
I
1. Populate the following components.
Qty.
Reference
Desianator
35
C1, C2, C3,
AM Part
Manufacturer Part
Number
2886
Manufacturer
Description
Number
ECJ-1 VF1 E1 042
Panasonic
C4, C6, C7,
.1uF, 25VDC Cap,
0603
C8, C9, C10,
I
C11, C12,
C13, C14,
C15, C16,
C17, C18,
C19, C21,
C22, C23,
C24, C25,
C26, C27,
C29, C30,
C31, C32,
C33, C36,
C37, C38,
C39, C50
I
1
C5
2887
ECQ-P1H223GZ
2
I C20
2840
ECS- T1 EY1 05R
Panasonic
1 uF Tantalum Cap,
Panasonic
1 uF, 0805 Ceramic
Panasonic
.O22uf Polypropylene
Film Cap
25 volts
1
C34
2961
ECJ-2VF1C105Z
1
C28
2992
PCS-3106CT -ND
1
C35
2901
ECU-V1 H223KBX
Cap, 16V
Panasonic
10uF Tantalum Cap,
3528
! Panasonic
.022uF Capacitor,
§OV,0805
AM~
Oty.
Reference
DesiQnator
6
C44, C45,
AM Part
Manufacturer Part
2885
Manufacturer
11 ED226R
Panasonic
C46, C47,
4
C48. C49
D1, D2, D3,
Description
Number ECS-
Number
22uf Tantalum SMT
Cap
4232
BAS16
Rohm
Switching Diode
Dual Schottky Diode
D5
1
D4
2929
BAT54SCT -ND
Zetex
1
JP1
5760
TSW-105-08-G-D-
Samtec
JP2, JP3,
2930
terminal strip
RA
5
2x5 Right Angle
PZCO2SAAN
Sullins
Jumper, 2 Pins, Gold
PZC03SAAN ZSS-
Sullins
Jumper, 3 Pins. Gold
108-05-G-D- 915
Samtec
2x8 connector for 1"
JP4, JPS, J8
1
J4
2931
1
J9
5759
board spacino
310-93-164-41-001
1
J20, J21, J22,
5685
Mil-Max
J24
11 pin IC Strip Header
(64 pin to be cut into
4x11) 640457--4 Right
1
8
J23
RS, R7, R21,
2966
640457-4
Amp
Anale Connector
6033
2312-241-71004
BCC
.1%, 0805 25ppm
R23, R6, R9,
Resistor, 100K
R13. R14
R11
6034
2312-241-79763
ecc
.1%, 0805 25ppm
Resistor,
4
97.6K
6018
P200KACT -NO
Panasonic
200K,5%,O805
R8
3012
P1KOCCT-ND
Panasonic
1K, 1%, 0805
R10, R56 R12
2838
3214J-1-203E
Bourns
Trim Pot, SMT
6017
P39KACT -ND
Panasonic
39K.5%,O805
4490
P1 OOKCCT -ND
Panasonic
100K, 1%.0805
5798
P1692CCT -ND
Panasonic
16.9K, 1%,0805
6035
2312-241-71003
BGG
R51, R55,
R58, R59
1
1
6
R2, R4, R52,
R54, R61,
R64
R1, R3
2
R15
.1%, 0805 25ppm
Resistor. 10K
R16
6066
2312-241-76493
BCC
.1%, 0805 25ppm
Resistor. 64.9K
1
R17
6037
2312-241-72943
BCC
.1%,080525ppm
Resistor, 29.4K
1
R18
6038
2312-241-75622
BCC
R20
6040
2312-241-77503
eGG
.1%,080525ppm
Resistor,5.62K
1
.1%,080525ppm
Resistor, 75K
.A1fii,~
c..
DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference
Manual V1.0
.
Qty.
1
Reference
Desianator
R22
AM Part
Manufacturer Part
Number
January 10, 2000
Manufacturer
Description
Number
I
6039
30
2312-241-72672
BCC
'.1%,080525ppm
Resistor, 2.67K
1
R40
3010
1
R41
6019
4
R42, R43,
P10KCCT
-ND
P2K2ACT -ND
Panasonic
Panasonic
10K, 1%,0805
2.2K. 5%, 0805
Select On Test
R44, R45
4
2826
P470KACT -ND
Panasonic
470K, 5%, 0805
R57. R53
3239
P15KACT-ND
Panasonic
15K,
R63, R62
2907
P1 K5ACT -ND
Panasonic
1.5K, 5%, 0805
R6S
2825
P47KACT
Panasonic
47K, 5%, 0805 1
R67
6006
P1MOACT-ND
Panasonic
M, 5%, 0805
51
2842
EVQ-QHVO2W
Panasonic
Pushbutton Switch,
1
U1
2892
LM2904M-ND
National
Dual Low Power
4
U3, U5, U6,
2803
OP177FS
Burr Brown
Ultraprecision Operational
R49, R50,
R60, R66
:?:..
2
1
1
1
-ND
5%,
0805
SMT
U11
Amplifier, I
S08
2
U4, US
2807
ADG419BRM
Analog Devices
Dual Precision
Analog Switch,
uSOIC
1
U7
4925
1
U9
2858
1
U10
2991
1
U12
2809
AD588JO
Analog Devices
CY37064P44-
Cypress
CPLD, 44 pin TOFP
ADG202AKR
Analog Devices
Analog Switch,
P89C51 RC+JB
Philips
Precision Voltage
Reference
125AC
16S0lC
Flash ISP
Microcontroller, 32K,
PQFP44
1
U13
2808
ADG426BRS
Analog Devices
16 Channel Analog
MUX, SSOP
PackaQe
! Motorola
1
U14
2904
DM74LSO4M-ND
1
U15
2804
MC4741CD
Motorola
1
U16
2805
CD4013BCM
National
1
X1
2919
SG-636PCE-
Epson
LS TTL Inverter,
SO-14
Quad 741 OP-AMP,
50-14
Dual Flip-Flop,
4000CM08, 80-14
33.000MC2
.II:MI~
33MHz Oscillator
2. Populate the Ferrite Beads. Use a single loop of 22 Gauge solid wire to attach the ferrite
beads to the PCB.
Qty.
Reference
Designator
7
L1, L2, L3,
AM Part
Manufacturer Part
Number
2918
Manufacturer
Description
Number
FB73-226
JW Miller
Ferrite Beads,
0-40MHz
I
I
3. Populate the terminal plugs so the notch points into the board. This ensures that the wires are
oriented off the board instead of over the top of the board.
f}~1 ~
4. Populate the jumpers.
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4.5 Lower Board ECO List
1,
Before populating 02 there is a trace which must be cut under the device. The trace from
02 pin 12 goes to a via and attaches to one of the planes. The trace must be cut before the
via. 02 can then be populated. Attach the 51 pF capacitor
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DN: 1626 -Dalhousie Heat Flow Probe Hardware Reference Manual V1.0
January 10, 2000
32
to the board (hot glue or epoxy) close to pin 12. Connect one side of the capacitor to Cos
(U2 pin 12) and the other side to ground (U2 pin 16).
Qty.
Reference
AM Part
Manufacturer Part
Desianator
Number
Number
1
U2
1
C51
Manufacturer
De!iCriptili>n
2806
AD652KP
Analog Devices
V to F Converter.
5807
PCC510CCT -NO
Panasonic
51 pF, 1206, SMT,
PLCC20
NPO ceramic
capacitor
4.6 Lower Board Notes
1. The footprint for U12 (89C51RC) appears to be incorrect. The leads on the device
are longer than the pads which causes some problems when soldering the device.
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