Huawei ME906s LTE M.2 - Page 25

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.
25
Figure 3-6 Recommended power off timing sequence (cut off 3.3 V)
If ME906s is powered directly to battery
For use case ME906s is connected directly to battery, such as tablet platforms,
Power_On_Off should be controlled by a GPIO from the host to control ME906s to be
powered on/off.
It is critical to make sure the module is safely shut off when the tablet SoC is shut off.
There will be current leakage if the module is not shut off properly. So it is important
to keep Power_On_Off logic low for more than 500 ms to shut off the module.
The recommended connection is shown as Figure 3-7 .
Figure 3-7 Recommended connection of Power_On_Off pin (control)

Power on sequence
3.3V
RESET#
Power_On_Off
Power off
ME906s
Pin6
HOST
GPIO
Power_On_Off