GL865-DUAL V3 Hardware User Guide
1vv0301018 Rev.5 – 2013-08-05
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 22 of 76
Mod. 0805 2011-07 Rev.2
5.3.
Resetting the GL865-DUAL V3
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 stuck waiting for some network or
SIM responses.
To unconditionally reboot the GL865-DUAL V3, 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-DUAL V3 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:
In the following flow chart is detailed the proper restart procedure: