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GL865 Hardware User Guide
1vv0300910 Rev.1 – 2011-07-22
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 21 of 79
5.3.
Resetting the GL865
5.3.1.
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
stacked waiting for some network or SIM responses.
To unconditionally reboot the GL865, the pad RESET* must be tied
low for at least 200 milliseconds and then released.
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 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: