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HUAWEI ME936 LTE M.2 Module
Hardware Guide
Description of the Application Interfaces
Issue 03 (2017-12-11)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
27
Figure 3-11
Recommended warn boot timing in the notebook/tablet
If there is a limitation on the controlling GPIO to be programmable 500 ms, the
following hardware solution can be used, as shown in Figure 3-12 .
Figure 3-12
Power on/off circuit (hardware solution)
3.3V (battery,
always on)
.
RESET#
Power_On_Off
Warn boot in the notebook/tablet
t2
≥ 500 ms
t2
ME936
Pin6
HOST
0
Ω
VCC
GPIO2
1M
Ω
NMOS
NMOS
3.3V
(battery)
GPIO2
Q1
Q2
Power_On_Off
VCC
GPIO2
is the power domain of the GPIO2.
When
VCC
GPIO2
is
ON
, Q2 is on and Q1 is off. So the Pin6 is controlled by
GPIO2 of host.
When
VCC
GPIO2
is
Off
, Q2 is off and Q1 is on. So the Pin6 is pulled low,
then the module is powered off.