I65/I56I HARDWARE DESCRIPTION VERSION
1.00
RESET pin causes the loss of all information stored in the volatile
memory since power is cut off immediately. Therefore, this
procedure is intended only for use in case of emergency, e.g. if
I56/I56i fails to shut down properly.
This signal is used to force a reset procedure by providing low level (driven to
ground) during at least 3.2 s. This signal has to be considered as an emergency
reset only. A reset procedure is already driven by an internal hardware during
the power-up sequence.
If no external reset is necessary, this input can be left open. If used (emergency
reset), the RESET signal is available on the board-to-board connectors.
5.4.3.7.1 How does it work?
a) Voltage V
VC5+
is permanently applied to the module.
b) The module is active while the internal reset signal is kept at high level.
During operation of I56/I56i the base band controller generates watchdog
pulses at regular intervals. Once the RESET pin is grounded these
watchdog pulses are cut off from the power supply ASIC. The power
supply ASIC shuts down the internal supply voltages of I56/I56i after
max. 3.2 s and the module turns off.
Figure 5:
Deactivating GSM engine by RESET signal
5.4.4 Automatic
shutdown
Automatic shutdown takes effect if
the I56/I56i board is exceeding the critical limits of over temperature or
under temperature.
the battery is exceeding the critical limits of over temperature or under
temperature.
under voltage is detected.
The automatic shutdown procedure is equivalent to the power-down initiated
with the
AT^SMSO
command, i.e. I56/I56i logs off from the network and the
software enters a secure state avoiding loss of data.
NOTE
: This does not apply if over voltage conditions or unrecoverable
hardware or software errors occur (see below for details).
Alert messages transmitted before the device switches off are implemented as
Unsolicited Result Codes (URCs). The presentation of these URCs can be
enabled or disabled with the two AT commands
AT^SBC
and
AT^SCTM
. The
URC presentation mode varies with the condition, please see chapters
to
for details. For further instructions on AT commands refer to [
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