Huawei ME906s LTE M.2 Hardware Manual page 27

HUAWEI ME906s LTE M.2 Module
Hardware Guide
Figure 3-10 Recommended warm boot timing in the notebook/tablet
3.3V (battery,
always on)
RESET#
Power_On_Off
If there is a limitation on the controlling GPIO to be programmable 500 ms, the
hardware solution as shown in Figure 3-11 can be used.
Figure 3-11 Power on off circuit (hardware solution)
Module
VCC
When
GPIO2 of host.
When
then the module is powered off.
Issue 05 (2019-03-25)
.
t2 ≥ 500 ms
Power_On_Off
Pin 6
NMOS
Q1
is the power domain of the GPIO2.
GPIO2
is ON, Q2 is on and Q1 is off. So the Pin 6 is controlled by
VCC
GPIO2
is Off, Q2 is off and Q1 is on. So the Pin 6 is pulled low,
VCC
GPIO2
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Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
t2
Warm boot in the notebook/tablet
3.3V (battery)
1MΩ
NMOS
0Ω
Q2
HOST
GPIO2
VCC
GPIO2
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