User's Manual

Table Of Contents
WM_PRJ_Q2400_PTS_002 - 004
March 5, 2004
2.15.2 Operating sequences
2.15.2.1 Power ON
Once the module is supplied by the power source, the application must set the ON/~OFF signal to
high to start the module power ON sequence.
The ON/~OFF signal must be held for 1 s minimum. After this time, an internal mechanism keeps it
on hold. During the power ON sequence, an internal reset is automatically performed by the module
for 240 ms (typical). During this phase, any external reset should be avoided.
Once the initialisation is complete (timing is SIM and network dependent) the AT interface answers
« OK » to the application
2
. For further details, please refer to the AT commands documentation
(AT+WIND, AT+WAIP)
POW ER SUPPLY
ON/
~
OFF
ST A TE OF TH E M OD ULE
Module OFF
I
BB+RF
< 10 µA
A
T answ ers « OK »
Module READY
T
on/off-hold
(1 s m in )
SIM and Netw ork dependent
RESET m ode
I
BB+RF
=20 to 40 mA
INTERNAL RST
T
rst
(240 ms typ)
M odule ON
I
BB+RF
<120 mA
(no loc. update)
I
BB+ RF
= overall current consumption (Base Band + RF part)
Figure 3: Power-ON sequence diagram (no PIN code activated)
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2
For this, the application has to send AT. If the application manages hardware flow control, the AT command can be sent
during the initialisation phase. Another solution is to use the AT+WIND command to get an unsolicited status from the
module.