Huawei MU709 Series Hardware Manual page 27

HUAWEI MU709 Series HSPA+ LGA Module
Hardware Guide
Table 3-4 Two states of POWER_ON_OFF
Item
1
2
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
Issue 09 (2017-12-15)
Pin state
Low (when MU709
module is in power off
state.)
Low (when MU709
module is in power on
state.)
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Description of the Application Interfaces
Description
MU709 module is powered on.
POWER_ON_OFF pin should be pulled down for
1.0s at least.
MU709 module is powered off.
POWER_ON_OFF pin should be pulled down for
4.0s at least.
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