TPS65982: TPS65982 BC1.2 timing Question

Satoshi Yone

Part Number: TPS65982

Hi, Team,

We have questions for D+/D- connection. The application is NB. D+/D- signal is connected to CPU through the TPS65982.

Q.1. When does D+/D- signal pass through to the CPU after Type-C cable connection? My understanding is the below sequence.

At first the cable is connected to TPS65982 port. D+/D- signal doesn't pass to the CPU before CDP/DCP detection.
"Type-C Connector(D+/D-) -- TPS65982 -x- CPU"

The D+/D- signal pass through to the CPU after CDP/DCP detection
"Type-C Connector(D+/D-) -- TPS65982 --- CPU"

Q.2 Is it possible to disconnect D+/D- signal pass between TPS65982 and CPU after the BC1.2 detection?

Best Regards,
Satoshi Yone

over 7 years ago

0 Yongqiang Sun over 7 years ago

TI__Intellectual 2685 points

Hi Yone,

Thank you for your interest in a Texas Instrument’s solution. Due to the Christmas/New Year holidays, our response time is likely to be longer than usual. Rest assured we have received your question and want to close it as soon as possible. If this is truly urgent, we suggest you work through your local support and/or procurement channels.

0 Eric Beljaars over 7 years ago in reply to Yongqiang Sun

TI__Mastermind 36756 points

Hi Yone-san,

Q1. Your understanding is correct, the TPS65982 will not pass through the USB D+/D- data while it is completing BC1.2 detection. Section 8.3.4.8, 8.3.4.9, and 8.3.4.10 of the TPS65982 datasheet discuss the BC1.2 detection logic and flow.

Q2. It is possible to disable the USB D+/D- after BC1.2 detection by disabling "USB RP" in the System Configuration Register (0x28).

Thank you,
Eric

0 Satoshi Yone over 7 years ago in reply to Eric Beljaars

TI__Expert 3600 points

Hi, Eric,

Thanks!

Best Regards,
Satoshi Yone

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TPS65982: TPS65982 BC1.2 timing Question