User's Manual

GL865-DUAL/QUAD V3 Hardware User Guide
1vv0301018 Rev.7 – 2013-10-30
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Reserved. Page 37 of 78
Mod. 0805 2011-07 Rev.2
8.1. Reset signal
Signal Function I/O pin
RESET* Phone reset I 47
RESET* is used to reset the GL865-DUAL/QUAD V3. Whenever this signal is pulled low,
the GL865-DUAL/QUAD V3 is reset. When the device is reset it stops any operation. After
the release of the reset GL865-DUAL/QUAD V3 is unconditionally shut down, without doing
any detach operation from the network where it is registered. This behavior is not a proper
shut down because any GSM device is requested to issue a detach request on turn off. For this
reason the Reset signal must not be used to normally shutting down the device, but only as an
emergency exit in the rare case the device remains stuck waiting for some network response.
The RESET* is internally controlled on start-up to achieve a proper power-on reset sequence,
so there's no need to control this pin on start-up. It may only be used to reset a device already
on that is not responding to any command.
NOTE:
Do not use this signal to power OFF the GL865-DUAL/QUAD V3. Use the ON/OFF
procedure to perform this function.
Reset Signal Operating levels:
Signal Min Max
RESET* Input high 1.8V(NOTE1) 2.1V
RESET* Input low 0V 0.2V
(NOTE1) this signal is internally pulled up so the pin can be left floating if not used.
If unused, this signal may be left unconnected. If used, then it must always be connected with
an open collector transistor, to permit to the internal circuitry the power on reset and under
voltage lockout functions.