LEXI-R422 - System integration manual
UBX-23007449 - R02
System description
Page 25 of 108
C1-Public
1.6.3
Module reset
LEXI-R422 modules can be cleanly reset (rebooted) by:
•
AT+CFUN=16 command (see the AT commands manual
In the case above an “internal” or “software” reset of the module is executed: the current parameter
settings are saved in the
module’s non
-volatile memory and a clean network detach is performed.
An abrupt hardware reset (reboot) occurs on the LEXI-R422 modules when a low level is applied on
PWR_CTRL
input pin for a long time period (see the LEXI-R422 data sheet
). In this case, the
current parameter settings are not saved in the module’s non
-volatile memory and a clean network
detach is not performed.
☞
It is highly recommended to avoid an abrupt hardware reset (reboot) of the module by forcing a low
level for a long time period on the
PWR_CTRL
input pin during modules normal operation: the
abrupt hardware reset (reboot) should be performed only if reset or shutdown via AT commands
fails or if the module does not provide a reply to a specific AT command after a time period longer
than the one defined in the AT commands manual
⚠
Forcing an abrupt hardware reset (reboot) during LEXI-R422 modules normal operations may lead
to an unrecoverable faulty state!
The
PWR_CTRL
input pin is directly connected to the power management unit IC, with an integrated
pull-up to an internal supply domain, in order to perform an abrupt hardware reset when asserted for
a specific time period. Detailed electrical characteristics with voltages and timings are described in
the LEXI-R422 data sheet
P15
PWR_CTRL
LEXI-R422
Power Management Unit
Switch-on
Reset
Shutdown
1.5V
Figure 14: PWR_CTRL input pin description
