Telit Wireless Solutions UC864 manual Hardware Unconditional Restart

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

4.2.2 Hardware Unconditional Restart

To unconditionally restart UC864-E, 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. A simple circuit to do it is:

RESET#

Unconditional Restart impulse

GND

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 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.

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