Huawei ME909 Series Hardware Manual page 27

HUAWEI ME909 Series LTE LGA Module
Hardware Guide
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
Parameter
T
PON
T
PD+
If the DTE needs to detect the PID/VID of module during the BIOS phase, the
detection time should exceed the T
Figure 3-7 Power off timing sequence
Table 3-6 Power off timing
Parameter
T
POFF
Issue V0.3 (2013-05-21)
Comments
POWER_ON_OFF turn on time.
POWER_ON_OFF Valid to USB
D+ high
PD+
Comments
POWER_ON_OFF turn off time.
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Description of the Application Interfaces
Time (Nominal values)
0.5–1.0
12
time.
Time (Nominal values)
3.0–5.0
Units
s
s
Units
s
27