Huawei MU736 Hardware Manual page 25

HUAWEI MU736 HSPA+ M.2 Module
Hardware Guide
Figure 3-10 Recommended power off timing (connect to battery)
3.3V (Vbatt,
always on)
RESET#
Power_On_Off
If there is limitation on the controlling GPIO to be programmable 500 ms, the hardware
solution can be used, as shown in Figure 3-11 .
Figure 3-11 Power on off circuit (hardware solution)
MU736
VCC
When VCC
GPIO2 of host.
When VCC
then the module is powered off.
Issue 05 (2014-01-14)
t1
t1 ≥ 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 Pin6 is controlled by
GPIO2
is Off, Q2 is off and Q1 is on. So the Pin6 is pulled low,
GPIO2
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Description of the Application Interfaces
Logic low or high-impedance (preferred)
Logic low or high-impedance (preferred)
Power off
3.3V (battery)
1MΩ
NMOS
0 Ω
Q2
HOST
GPIO2
VCC
GPIO2
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