Power-On/Off (Power_On_Off) Pin - Huawei ME909u-521 Hardware Manual

HUAWEI ME909u-521 LTE LGA Module
Hardware Guide

3.4.2 Power-on/off (POWER_ON_OFF) Pin

The ME909u-521 module can be controlled to be powered on/off by 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 sequence, please make sure the VBAT is stable.
Figure 3-4 Power on timing sequence
Table 3-4 Power on timing
Parameter
T
PON
T
PD+ON
If the DTE needs to detect the PID/VID of module during the BIOS phase, the
detection time should exceed the T
Issue 05 (2017-12-15)
Comments
POWER_ON_OFF turn on time.
POWER_ON_OFF Valid to USB D+ high
PD+
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Description of the Application Interfaces
Time (Nominal
values)
0.5–1.0
12
time.
Units
s
s
28