HUAWEI MU709 Series HSPA+ LGA Module
Hardware Guide
Description of the Application Interfaces
Issue 09 (2017-12-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
27
Table 3-4
Two states of POWER_ON_OFF
Item Pin state
Description
1
Low (when MU709
module is in power off
state.)
MU709 module is powered on.
POWER_ON_OFF pin should be pulled down for
1.0s at least.
2
Low (when MU709
module is in power on
state.)
MU709 module is powered off.
POWER_ON_OFF pin should be pulled down for
4.0s at least.
Figure 3-3
Connections of the POWER_ON_OFF pin
Power-On Time Sequence
After VBAT has been applied and is stable, the POWER_ON_OFF signal is pulled
down, and then the module will boot up.
During power on timing, please make sure the VBAT is stable.
Figure 3-4
Power on timing sequence