Specifications

WM_PRJ_Q2501_PTS_001 – 003
March 2004
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2.5.4.2 Reset sequence
To activate the « emergency » reset sequence, the ~RST signal has to be set to
low for 500
µ
s minimum.
As soon as the reset is complete, the AT interface answers « OK » to the
application. For this, the application has to send AT
↵
. If the application manages
hardware flow control, the AT command can be sent during the initialization
phase. Another solution is to use the AT+WIND command to get an unsolicited
status from the module.
For further details, refer to AT commands documentation [4].
RESET mode
I
BB+RF
=20
to 40 mA
EXTERNAL RST
STATE OF THE MODULE
Module READY
Min:500
µ
s
Typ:2 ms
AT answers “OK”
Module READY
SIM and network dependent
Module ON
I
BB+RF
<120 mA
without loc update
Figure 11: Reset sequence diagram
2.5.5 Activity status indication
The GSM and GPS activity status indication signals can be used to drive two
LEDs through an open-collector transistor according to the module activity
status.
Pin description
Signal Pin # I/O I/O type Description
FLASH_LED 72 I/O CMOS/2x GSM Status
GPS_TIMEPULSE
17 I/O 1V8_CMOS GPS Status
FLASH_LED GSM status
OFF Module in download mode or module OFF
Permanent Module switched ON, not registered
on the network
ON
Slow flash
LED ON for 200 ms,
OFF for 2 s
Module switched ON, registered on
the network, no communication in
progress.