TPS2546: TPS2546 discharge OUT twice when charge mode change from CDP to DCP_Auto

Randy Chen

Part Number: TPS2546

Hi,

Customer captured OUT waveform as below and questioned why OUT discharged twice when charge mode change from CDP to DCP_Auto? Can you please comment?

Best regards,

Randy Chen

over 7 years ago

0 Chuck Branch over 7 years ago

TI__Mastermind 32891 points

Randy,

Do they have a capture of what is happening on the D+/D- lines during this procedure.

The state machine requires a discharge when leaving SDP to transition into DCP_auto; however, it is not required to do a second discharge, so I would like to see what is happening on the Datalines to try to see where this second discharge is coming from.

Regards,
Chuck

0 Chuck Branch over 7 years ago in reply to Chuck Branch

TI__Mastermind 32891 points

Randy,

Any update on this issue?

Regards,
Chuck

0 Randy Chen over 7 years ago in reply to Chuck Branch

TI__Intellectual 2295 points

Hi Chuck,

Customer is checking the Data lines waveform and should responded soon. Thank you for your comment.

Best regards,

Randy

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TPS2546: TPS2546 discharge OUT twice when charge mode change from CDP to DCP_Auto