User's Guide

ME910C1 HW User Guide
1VV0301351 Rev. 2 Page 38 of 81 2017-07-19
Unconditional Shutdown
HW_SHUTDOWN* is used to unconditionally shutdown the ME910C1. Whenever this
signal is pulled low, the ME910C1 is reset. When the device is reset it stops any
operation. After the release of the line, the ME910C1 is unconditionally shut down, without
doing any detach operation from the network where it is registered. This behaviour is not a
proper shut down because any WCDMA device is requested to issue a detach request on
turn off. The HW_SHUTDOWN* is internally controlled on start-up to achieve always a
proper power-on reset sequence, so there's no need to control this pin on start-up.
To unconditionally shutdown the ME910C1, the pad HW_SHUTDOWN* must be tied low
for at least 200 milliseconds and then released.
The signal is internally pulled up so the pin can be left floating if not used.
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.
PIN DESCRIPTION
Signal Function I/O PAD
HW_SHUTDOWN*
Unconditional Shutdown of
the Module
I R13
OPERATING LEVELS
Signal Status Min Max
HW_SHUTDOWN* Input high 1.5V 1.9V
HW_SHUTDOWN* Input low 0V 0.35V
WARNING:
The hardware unconditional Shutdown 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.
A typical circuit is the following: