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BQ24195L USB Detection

Hi Tiers.

I have a question about USB detection.

Below image is my system and REG08 description in datasheet.

Case 1 ) When 3G Module is not working (power off), REG08[7:6] is 01(USB port) or 10(Wall Charger), USB detection is good.

Case2 ) When 3G Module is working (power on), REG08[6:7] is always 00, unknow status.

Why case 2 is occured?

Even if case 2, I think VBUS_STAT have to be USB host or Adapter port.

Please let me know how can use ASAP.

Thanks.