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HUAWEI MC509 CDMA LGA Module
Hardware Guide
Description of the Application Interfaces
Issue 01 (2011-04-08)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
28
Figure 3-3 shows the connections of the POWER_ON_OFF and RESIN_N pins.
Figure 3-3 Connections of the POWER_ON_OFF and RESIN_N pins
Power-On Time Sequence
After VBAT has been applied and is stable, the module will generate an on board
power on reset signal and on the release of the reset, the module will boot up.
USB_DP will be pulled high when boot up completes, simultaneously the module
starts to communicate with host via USB or UART. Figure 3-4 shows power on timing
sequence.
During power on timing, please make sure the VBAT is stable.
Figure 3-4 Power on timing sequence