TDA4AL-Q1: USB0_DP and USB0_DM connected to GND

Xingyu Zhu

Part Number: TDA4AL-Q1

Dear expert,

Our customer connect USB0_DP and USB0_DM to GND directly in their board. Could you please check if it has the risk for the USB PHY during boot when not using USB module? Thanks

Best Regards,

Xingyu Zhu

over 1 year ago

0 ShreyasRao over 1 year ago

TI__Guru 61580 points

Xingyu,

Do you have a snip of the schematic for a clearer picture of the connections and review?

0 Xingyu Zhu over 1 year ago in reply to ShreyasRao

TI__Expert 4285 points

Hi Shreyas,

Customer hasn't shared the SCH with us. I draw a picture to illustrate their thought.

+1 ShreyasRao over 1 year ago in reply to Xingyu Zhu

TI__Guru 61580 points

From what I have based on the initial feedback, as long as USB is NOT part of any enabled boot mode and the software leaves the interface disabled, I think this should be OK.

By default, the pins must be configured correctly to not drive on these pins. It will be a good idea in general to have a resistor (1k/ 10k) to gnd.

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TDA4AL-Q1: USB0_DP and USB0_DM connected to GND