HD3SS2522: RST Timing Requirement

Roy Hsu

Part Number: HD3SS2522

Hi Team,

We're seeing an issue with 1% of failure rate where the USB device can't be recognized when the system first startup. After we restart the system or we short RST to 3.3V, the USB device can be recognized.

We found that if we change UC26 to 4.7 uF then the issue can be resolved but I couldn't find anything about it in the datasheet.

Could you please comment on the timing requirement of the RST pin?

Thanks.

Roy

over 4 years ago

0 Malik Barton57 over 4 years ago

TI__Guru 64326 points

Hi Roy,

Could I get a schematic for review? CC1 and CC2 should not have pull-ups, why were those implemented. I will look into reset timing and get back to you. Schematic may also relieve some points on this.

0 Malik Barton57 over 4 years ago in reply to Malik Barton57

TI__Guru 64326 points

Moved to internal thread.

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HD3SS2522: RST Timing Requirement