Huawei MU609 - Page 27

HUAWEI MU609 HSPA LGA Module
Hardware Guide
Description of the Application Interfaces
Issue 04 (2016-12-12)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
27
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
Table 3-5 Power on timing
Parameter
Comments
Time (Nominal values)
Unit
T
PON
POWER_ON_OFF turn on time.
0.5–1.0
s
T
PD+
POWER_ON_OFF Valid to USB
D+ high
3.0–5.0
s
If the DTE needs to detect the PID/VID of module during the BIOS phase, the
detection time should exceed the T
PD+
time.
Power-Off Time Sequence