Rainbow Electronics GM862-GPS - Manual (Page 22)

GM862-GPS Hardware User Guide
1vv0300728 Rev. 8 - 20/09/07
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 22 of 73
5.2.2 Hardware Unconditional Shutdown
To unconditionally Shutdown the GM862-GPS the pin RESET# must be tied low for at least 200
milliseconds and then released.
The maximum current that can be drained from the ON# 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-GPS power regulator and improper functioning of the module. The
line RESET# must be connected only in open collector configuration.
TIP: The unconditional hardware reset should be always implemented on the boards and software should use it as
an emergency exit procedure.
RESET#
Unconditional Power OFF
impulse
GND