Specifications

WM_PRJ_Q2400_PTS_001 - 003
6th November 2002
confidential ©
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Operating conditions
Parameter Min Max Condition
*V
T-
1.1V 1.2 V
*V
T+
1.7V 1.9 V
V
OL
0.4 V I
OL
= -50 µA
V
OH
2.0 V I
OH
= 50 µA
* V
T-,
V
T+ :
Hysterisis Level
Additional comments on RESET:
The RESET process is activated either by the external ~RST signal OR by an
internal signal (coming from a RESET generator). This automatic reset is
activated at Power-up.
The module remains in reset mode as long as the RST signal is held low. This
signal should be used only for “emergency” resets.
A software reset will be preferred to a HW reset.
2.15.1 Reset sequence
To activate the « emergency » reset sequence, the ~RST signal has to be set to
low for 100
µ
s minimum. As soon as the reset is complete, the AT interface
answers « OK » to the application
5
.
RESET mode
I
BB+RF
=20 to
40mA
EXTERNAL RST
STATE OF THE MODULE
Module READY
Min:100
µ
s
Typ:2ms
AT answers “OK”
Module READY
SIM and network dependent
Module ON
I
BB+RF
<120mA
without loc update
Figure 14 : Reset sequence
5
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 +WIND
command to get an unsollicited status from the module.