Huawei ME906s LTE M.2 - RESET# Pin

HUAWEI ME906s LTE M.2 Module
Hardware Guide
Description of the Application Interfaces
Issue 05 (2019-03-25)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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3.4.3 RESET# Pin
The ME906s module can be reset through the RESET# pin asynchronous, active low.
Whenever this pin is active, the module will immediately be placed in a Power On
reset condition. Care should be taken for this pin unless there is a critical failure and
all other methods of regaining control and/or communication with the WWAN sub-
system have failed.
Pulling low RESET# more than 20 ms and then pulling high will reset the module.
RESET# is optional, which can be not connected. Pulling low Power_On_Off for
more than 500 ms and then pulling high can also work as a reset.
RESET# is internally pulled up to 1.8 V, which is automatically on when 3.3 V is
applied even though Power_On_Off is low. Cautions should be taken on circuit
design or else there may be back driving issue.
Hardware circuit for RESET# (option 1)
GPIO is high-impedance when the host is powered off.
Hardware circuit for RESET# (option 2)
GPIO is not high-impedance when the host is powered off.
Use 2 N-MOSFET so that the logic of RESET# and GPIO are the same.
Module
Pin 67
0Ω
RESET#
HOST
GPIO1
GPIO1 should be high-impedance
when it is powered off.
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