* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download 1 - ComHem.SE
Yagi–Uda antenna wikipedia , lookup
Oscilloscope history wikipedia , lookup
Audio power wikipedia , lookup
Direction finding wikipedia , lookup
Cellular repeater wikipedia , lookup
Integrating ADC wikipedia , lookup
LN-3 inertial navigation system wikipedia , lookup
Josephson voltage standard wikipedia , lookup
Operational amplifier wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Radio transmitter design wikipedia , lookup
Analog-to-digital converter wikipedia , lookup
Index of electronics articles wikipedia , lookup
Schmitt trigger wikipedia , lookup
Current mirror wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Power MOSFET wikipedia , lookup
Immunity-aware programming wikipedia , lookup
Voltage regulator wikipedia , lookup
Power electronics wikipedia , lookup
Surge protector wikipedia , lookup
Switched-mode power supply wikipedia , lookup
APPPLICATION NOTE How to Check Integration part Between DR-GPS and Host -P 1- 1. Introduction The purpose of this note is to help customer to check integration part between DR-GPS module and Host(=customer’s navigation system). Even Trimble provides detailed specification of DR-GPS, customers have encountered technical problems, which was figured out in development period or production line. Based on our experience, the root cause of the problem could be found out at development period, which was skipped or not clearly determined. Through this note, customer can understand how to check their system, which DR-GPS interfaces over I/O connector. 2. Checking Items. Item Vantenna Vbackup Voltage level of Rx & Tx Vcc Tacho RESET Reverse Signal Vgyro Specification +5V 2.5~3.6V +3.3V+/-0.2V +3.3V+/-0.2V 3.3V 3.3V 0/3.3V 5V Comments Refer to GPS Antenna specification Try power-on/off test No pull-up to 5V 4.75~5.25V -P 2- 3. Test Procedure 3.1 Vantenna Measure Vantenna(: Pin2 of HIP Module) through DMM(Digital Multimeter). And measure Voltage at GPS RF connector. There could be Voltage drop at Hip module but it is less than 0.3V. The Voltage level at GPS RF Connector should meet GPS Antenna’s spec. If there is Voltage ripple, measured with Oscilloscope at GPS RF connector, it should meet GPS antenna, customer will use. Please check it with your GPS Antenna supplier. When GPS Antenna is put over roof, the SNR level would be like below. However GPS antenna installation inside a vehicle results into SNR degradation. If the SNR level is so low as 30~40dB, something ( adding high-gain antenna or reducing cable length ) should be taken. Take a look at SNR ripple. It should be stable. If it fluctuates, please check current to GPS antenna. NOTE: When many devices share the same 5V source, please consider total power consumption in design period. Try power-on/off and see how stable SNR level is stable. 3.2 Vbackup This application is for Host with back-up bat for DR-GPS. Let DR-GPS connected with Back-up BAT. Try Power-on/off many times. And see Voltage level (:Pin4 of HIP Module ). It should meet DR-GPS Spec(2.5V~3.6V) 3.3 Voltage level of Rx & Tx -P 3- The Voltage level of Rx( to HIP Module) should not exceed +3.1~3.5V range. Tx ( to Host) line should not be pulled up to 5V. 3.4 Vcc Prime power : +3.1VDC to +3.5VDC(3.3V typ.) Ripple Noise : Max 100mV, peak-to-peak from 1Hz to 1MHz Check Vcc(:Pin 7 of HIP Module) to GND(: Pin 8 of HIP Module ) through Oscilloscope. Power Consumption : Max 250mW excluding GPS Antenna. Check it with Current meter. Power on/off to Host and see any overshoot/undershoot is applied to DR-GPS module. Out of prime power range is not allowed. 3.5 Tacho Test configuration as below. Function HOST DR-GPS Module Generator LV-TTL->232 converter Scope PC Make jumper wire of Tacho Signal line(#10) from 14 I/O cable and signal line of F.G(Function Generator). Connector two jumper wire to Scope. Ajdust F.G and see how similar Tacho signal from I/O cable is to simulated Tacho signal from F.G. Try power-on/off to available devices of Host and see what happen to Tacho signal. Execute Dr-Monitor tool and check Tacho counts over tool. Note : Default time interval of 0x30-02 is 200ms. So F.G is set to output 10Hz, you can see “2” as Tacho counts. -P 4- 3.6 RESET Check the Voltage level of Reset(:Pin 11 of HIP Module). It should be pulled-up to 3.3V with 4.7kohm. 3.7 Reverse Signal Test Configuration. Power HOST DR-GPS Module supply LV-TTL->232 converter Scope PC Through scope, check voltage level (12V) from PS(Power supply ). Through scope, check voltage level (0/3.3V) from Reverse Signal line (:Pin 12 of HIP Module) during PS power-on/off. Through Dr-Monitoring tool, check Dir. Switch Val is changing from “0” to “1” or “1” to “0”. Note : Since we do not know whether inverter is installed in Host, applying 12V is considered as “0” or “1” to DR-GPS module. -P 5- 3.8 Vgyro For 5V Gyro component To test Vgyro part, 5mV resolution device is necessary. I have used Labjack U12. http://www.labjack.com/labjack_u12.php?prodId=27 Per 5V Gyro spec, more than +/-5mV ripple of 5V Vgyro is regarded as heading(Gyro) spinning HOST 5V Vgyro DR-GPS Module Gyro Output Gyro GND Labjack PC More than +/-5mV ripple is not allowed. Check Vgyro voltage level and power off Host. After 4h later, power on. Check Vgryo voltage level. Any voltage difference(+/- more than 5mV) between 4h-ago voltage and current voltage is not allowed. Try power on/off all devices, connected to 5V, of Host and see whether Vgyro is -P 6- changing. 12Bit ADC inside DR-GPS module consumes less than 4mA. Consider this. For 3V Gyro component( for example, EPSON VX-8100CB) To test Vgyro part, 5mV resolution device is necessary. I have used Labjack U12 Per 3V Gyro spec, more than +/-15mV ripple of 3V Vgyro is regarded as heading(Gyro) spinning HOST 3V Vgyro DR-GPS Module Gyro Output Gyro GND Labjack PC More than +/-15mV ripple is not allowed. Check Vgyro voltage level and power off Host. After 4h later, power on. Check Vgryo voltage level. Any voltage difference(+/- more than 5mV) between 4h-ago voltage and current voltage is not allowed. Try power on/off all devices, connected to 3V, of Host and see whether Vgyro is changing. 12Bit ADC inside DR-GPS module consumes less than 4mA. Consider this. 4. Summary This application note would be updated later, if more info is requested by developer. -P 7-