User's Manual

GM862-QUAD / PY Hardware User Guide

1vv0300748 Rev. 1 - 24/10/06

For example:

1- Let's assume you need to drive the RESET# pin with a totem pole output of a +3/5 V microcontroller

(uP_OUT2):

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 stacked waiting for some network or SIM responses.

If device does not respond to a command in the timeout window, retry issuing the command and if still

no response is received a hardware reset shall be issued.

Reset Signal Operating levels:

Signal Min Max

RESET Input high 2.0V* 2.2V

RESET Input low 0V 0.2V

* this signal is internally pulled up so the pin can be left floating if not used.

Unconditional Restart

impulse