HUAWEI ME909 Series LTE LGA Module
Hardware Guide
Description of the Application Interfaces
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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 3-6 Power on timing sequence
Table 3-5 Power on timing
POWER_ON_OFF turn on time.
POWER_ON_OFF Valid to USB
D+ high
If the DTE needs to detect the PID/VID of module during the BIOS phase, the
detection time should exceed the T
PD+
time.
Figure 3-7 Power off timing sequence
Table 3-6 Power off timing
POWER_ON_OFF turn off time.
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