Part Number:AM3352
Hello, TI expert
Processor-sdk-01.00.00.03 runs on custom board similar with am335x_gpevm. The USB bus works well if a USB disk attached, but not for a 4g modem such as HUAWEI ME909s. The root cause is USB1_DRVVBUS does not assert high on this condition, so 4G modem does not power up.
By the way, I have done a test which bypass the power mosfet TPS2051BD. 5V power is connected to the 4G modem directly, and the modem can work well. So my question is why USB1_DRVVBUS does not assert high?
Best Regards
Yang