WM_PRJ_Q2501_PTS_002
- 001
March
2004
confidential ©
Page:
24 / 79
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without prior written agreement.
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des tiers sans son autorisation préalable.
3.2.4
Activity status indication function (FLASH_LED &
GPS_TIMEPULSE)
The GSM and GPS activity status indication signals (FLASH_LED pin 72 and
GPS_TIMEPULSE pin 17) can be used to drive two LEDs through an open-
collector digital transistor according to the module activity status.
GPS_TIMEPULSE
GND
VBATT
U700
D702
1
2
R702
5
4
3
FLASH_LED
GND
VBATT
U700
« GSM »
D700
1
2
R700
470
Ω
2
1
6
« GPS »
470
Ω
Figure 9: Example N°1 of GSM and GPS activity status implementation
In addition, given the electrical characteristics of the FLASH_LED output signal
(CMOS 2.8 V), it is possible to directly connect a LED and a resistor between
this output and VBATT to avoid adding a digital transistor inverter.
FLASH_LED
470
Ω
GND
1
2
Figure 10: Example N°2 of GSM activity status implementation
Summary of Contents for WISMO Quik Q2501
Page 69: ......
