HW User Guide
1vv0301018 Rev. 15
Page
21
of
72
2019-01-07
Resetting the GL865 V3/V3.1
5.4.1.
Hardware Unconditional restart
WARNING:
The hardware unconditional Restart must not be used during normal
operation of the device since it does not detach the device from the network.
It shall be kept as an emergency exit procedure to be done in the rare case
that the device gets stuck waiting for some network or SIM responses.
To unconditionally reboot the GL865 V3/V3.1, the pad RESET* must be tied low for at least
200 milliseconds and then released.
The maximum current that can be drained from the ON* pad is 0,15 mA.
NOTE:
Do not use any pull up resistor on the RESET* line nor any totem pole digital
output. Using pull up resistor may bring to latch up problems on the GL865
V3/V3.1 power regulator and improper functioning of the module. The line
RESET* must be connected only in open collector configuration; the
transistor must be connected as close as possible to the RESET* pin.
TIP:
The unconditional hardware restart must always be implemented on the
boards and the software must use it as an emergency exit procedure.
A simple circuit to do it is:
