TPS65987D: USB Accessory power?

pdiddymac

Part Number: TPS65987D

Hi, will this part provide 5V to USB 2.0 devices for instance a USB to ethernet dongle?

I'm thinking legacy USB2 where the dongle only has Data lines, 5V, and GND with no CC lines. How does a device get power that does not have CC lines?

over 4 years ago

0 Michael Emanuel35 over 4 years ago

TI__Mastermind 40325 points

Hello,

You can use C_USB_N and C_USB_P to negotiate BC1.2 support in order to supply 5 V without CC lines.

Thanks,

Mike Emanuel

Please click "Resolved" if this answered your question.

0 pdiddymac over 4 years ago in reply to Michael Emanuel35

Intellectual 450 points

so in my system my TPS65987D is DRP and I have an MCU as data host. If I plug in an ethernet dongle that only has usb2 support, my TPS65987D will open PPHV2 to supply 5V because the dongle would have negotiated on the C_USB lines?

0 Michael Emanuel35 over 4 years ago in reply to pdiddymac

TI__Mastermind 40325 points

That is correct. The negotiation will ensure that the power path is open to provide power.

Thanks,

Mike Emanuel

Please click "Resolved" if this answered your question.

0 pdiddymac over 4 years ago in reply to Michael Emanuel35

Intellectual 450 points

Excellent, thank you!

0 pdiddymac over 4 years ago in reply to Michael Emanuel35

Intellectual 450 points

Sorry to open up a dead thread but what is the behavior of a USB2 device that gets plugged in with no CC lines?

0 Michael Emanuel35 over 4 years ago in reply to pdiddymac

TI__Mastermind 40325 points

An A-to-C cable should have a pulldown RD on CC to facilitate cable orientation and current limit settings. In this case CC would be connected.

Thanks,

Mike Emanuel

Please click "Resolved" if this answered your question.

0 pdiddymac over 4 years ago in reply to Michael Emanuel35

Intellectual 450 points

Amazing, thank you for the quick response.

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TPS65987D: USB Accessory power?