Huawei ME906s LTE M.2 - Page 27

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.
27
Figure 3-10 Recommended warm boot timing in the notebook/tablet
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)
3.3V (battery,
always on)
.
RESET#
Power_On_Off
Warm boot in the notebook/tablet
t2 ≥ 500 ms
t2
Module
Pin 6
HOST
0Ω
VCC
GPIO2
1MΩ
NMOS
NMOS
3.3V (battery)
GPIO2
Q1
Q2
Power_On_Off
VCC
GPIO2
is the power domain of the GPIO2.
When VCCGPIO2 is ON, Q2 is on and Q1 is off. So the Pin 6 is controlled by
GPIO2 of host.
When VCCGPIO2 is Off, Q2 is off and Q1 is on. So the Pin 6 is pulled low,
then the module is powered off.