User Manual

GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 5 - 20/09/07
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 19 of 68
5.2.2 Hardware Unconditional Restart
To unconditionally Shutdown the GM862-QUAD / PY the pin RESET# must be tied low for at least 200
milliseconds and then released.
The maximum current that can be drained from the RESET# pin is 0,15 mA.
A simple circuit to do it is:
NOTE: don't 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 GM862-QUAD / PY power regulator and improper functioning of the module.
The line RESET# must be connected only in open collector configuration.
TIP: The unconditional hardware Restart should be always implemented on the boards and software should use it
as an emergency exit procedure.
RESET#
Unconditional Restart
impulse
GND