Specifications

Product Technical Specification & Customer Design Guidelines
Interfaces
© Confidential
Page: 85 / 116
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without
prior written agreement.
WA_DEV_Q64_PTS_001-003 January 9, 2009
Undefined
2s
Wireless CPU
®
Status
RESET Timing
LED
1
led OFF
Figure 39 : LED state during RESET and Initialization time
3.18.2
Pin Description
Signal Pin
number
I/O I/O type Reset state Description
LED 33 O Open-
Collector
1 * LED driving
* This signal is undefined 2 seconds after the reset (initialization time).
3.18.3 Application
The GSM activity status indication signals LED (pin 33) can be used to drive a Light
Emitter Diode (LED). This signal is an open-collector from a PNP digital transistor
according to the Q64 activity status.
Figure 40: Example of GSM activity status implementation
A NPN transistor Q1 is used for driving the LED.
R1 value can be harmonized depending on the LED (D1) characteristics.
R2 is MANDATORY and should be implemented on the application side for the LED
flashing.