User's Guide

UC864-E-AUTO / AWS-AUTO Hardware User Guide
1vv0300795 Rev.11 – 2010/11/18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 20 of 78
5.3.3. Hardware Unconditional Restart
To unconditionally restart UC864-E-AUTO / AWS-AUTO, the pad RESET# must be tied
low for at least 200 milliseconds and then released.
A simple circuit to do it is:
NOTE:
NOTE: NOTE:
NOTE:
Do not use any pull up resistor on the RESET# line or any totem pole digital output.
Using pull up resistor may bring to latch up problems on the UC864-E-AUTO / AWS-
AUTO power regulator and improper functioning of the module. The line RESET#
must be connected only in open collector configuration.
TIP:
TIP: TIP:
TIP:
The unconditional hardware Restart must always be implemented on the boards and
the software must use it as an emergency exit procedure.
RESET#
Unconditional Restart
impulse
GND