User's Manual

page 39/64
Note d’étude / Technical document : URD1– OTL
5665.3 – 003 / 72238 Edition 01
Document Sagemcom Reproduction et divulgation interdites
Sagemcom document. Reproduction and disclosure prohibited
4.17 MODULE RESET
To reset the module, a low level pulse must be sent on RESET pad during 10 ms. This action will immediately
restart the HiLoNC V2 module. It is therefore useless to perform a new ignition sequence (POK_IN) after.

SAGEMCOM recommends using this feature in case of emergency, freeze of module or abnormal longer
time to respond to AT Commands, this signal is the only way to get the control back over the HiLoNC V2
module.

RESET is a low level active signal internally pulled up to a dedicated power domain.
As RESET is internally pulled up, a simple open collector or open drain transistor can be used to control it.
Figure 39: Reset command of the HiLoNC V2 by an external GPIO
The RESET signal will reset the registers of the CPU and reset the RAM memory as well.

As RESET is referenced to VGPIO domain (internally to the module) it is impossible to make a reset
before the module starts or try to use the RESET as a way to start the module.
An other solution more costly would be to use MOS transistor to switch off the power supply and restart the
power up procedure using the POK_IN input line.
4.18 MODULE SWITCH OFF
An AT command “AT*PSCPOF” allows to switch off «properly" the HiLoNC V2 module.
In case of necessary the module can be switched off by controlling the power supply. This can be used for
example when the system freezes and no reset line is connected to the HiLoNC V2. In this case the only way to
get the control back over the module is to switch off the power line. If the system is on a battery, it is wise to
have a control of the power supply by a GPIO with for example the following schematic.
SAGEM HiLoNC
V2 Module
DCE
HOST DTE
RESET_IN: 7
10ms
2.4V min
0.4V max
GPIO
2.8V