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TPS65982 : reason USB3.1/2.0 connection bit are 1b when BC1.2 is disabled

Naokazu Kinjoh
Intellectual 2740 points
Other Parts Discussed in Thread: TPS65982

Hi team,

 

We found that USB3.1 connection (bit5) and USB2.0 connection (bit 4) on data status register (0x5Fh) changes depend on BC1.2 support (bit32) on system configuration register (0x28h) when AC-adapter (PD) is connected to notebook PC. (TPS65982 is in notebook)

PC is DRP allowed PR/DR swap. Our PD adapter is not capable of USB communication.

(Case 1) BC1.2 disabled: USB3.1/2.0 connection bit = 1b

(Case 2) BC1.2 enabled: USB3.1/2.0 connection bit = 0b

That is the same result with TI EVM.

Would you tell us the reason that USB3.1/2.0 connection bit are 1b even though AC adapter is connected?

 

With present situation, the notebook cannot go to Power Save mode when AC-adapter connected because this USB bit arise disturbs the communication with CPU.

Customer wants that the USB connection bit not arise.

 

Best regards,

Naokazu Kinjoh