PCB of FRWD F-series GPS - Top layer

Components:

1. Bluetooth antenna (assumption)
2. Sarantel GeoHelix-S active GPS antenna
3. OBO Pro.2 OBO-40AL1 magnetic buzzer
   • Fr: 2300Hz, Sensitivity: min. 87dB / 3VDC / 10cm
4. Intersema air pressure sensor
5. Push button for the UI
6. DIP-switches, purpose?
7. ST LX C250 STMicroelectronics
8. Two LEDs for UI
9. One UI LED
10. Texas Instruments LM2904 dual op-amp
11. STMicroelectronics 2903 Z513, low power dual voltage comparator?
12. Texas Instruments LM2904 dual op-amp
13. Texas Instruments LM2904 dual op-amp

Bottom layer

Components:

1. Fastrax iTrax02/08 GPS receiver
   • 8Mbit internal flash
   • L1, 12 channels
   • RF chip uNav uN8021
   • baseband chip uNav uN8031
   • 1 Hz position update
   • acquisition time 50s (cold), 35s (warm), 8s (hot), 3s (quick)
   • including a proprietary 32MIPS RISC 16-bit DSP, running VSDSP RTOS
   • Interface description
   • Application notes
   • Product brochure
2. Heart rate receiver (assumption)
3. Radiating section of the GPS antenna
4. National Semiconductor LMX9820ASM Bluetooth serial port module
5. Air pressure sensor, front side
6. SG-3032 4233Q, Epson Electronics 32.758 kHz oscillator
7. 7555 IBA P336AXH, timer?

paulus, 2008/06/15