TPD3S716-Q1: TPD3S716-Q1 Short to GND

Imelda Zhang

Part Number: TPD3S716-Q1

Hi Expert,

During the verification for USB protector TPD3S716, I met an issue on the fault pin (Pin 10), issue description is shown as below, and also attached the partial schematic for you reference.

The fault pin is pull_up to 3.3V

In the normal condition, I can measure the voltage of fault is 3.3V, I think it is normal.
When I short the VBUS to GND, I can also measure the voltage of fault pin is 3.3V. I think it is abnormal, theoretically, short the VBUS to GND, it should trigger the OC, and also output a low level voltage.

From the datasheet, I can read when the OC is triggered, it will continue to detect and retry by itself. From my understanding, if I set the short between VBUS and GND continuously, the protector will not de-assert fault and resume normal operation, please correct me.

Thanks a lot for your warm help!

Best regards,

Imelda

over 2 years ago

0 Kuno Wu over 2 years ago

TI__Mastermind 18556 points

Hi Imelda,

We will reply to you next week, thank you.

Best Regards,

Kuno

0 Ya XU over 2 years ago

Prodigy 20 points

Hello Kuno， This is Ya XU from Bosch Suzhou HW team, appreciate that team can give a speed up support, thanks a lot

0 Ziv Zhang over 2 years ago

TI__Mastermind 18031 points

Hi Imelda,

You should test the waveform by oscilloscope instead of multimeter.

If you read its waveform, it should be cycle I suppose.

0 Ya XU over 2 years ago in reply to Ziv Zhang

Prodigy 20 points

Hello Ziv，

This is Ya XU from Bosch Suzhou HW team, actually I Used the oscilloscope to catch the waveform before, it isn't cycled, when I short the VBUS and GND, it outputs the 3.3V continuous.

Anyway, I tried to use the oscilloscope to catch the waveform again just now, the strange phenomenon is: it becomes normal, when I short the VBUS and GND, it can output low level voltge. The same sample with last test. very strange, I will try it tomorrow again, it seems not stable.

0 Ziv Zhang over 2 years ago in reply to Ya XU

TI__Mastermind 18031 points

Hi Xu,

Try to do the A/B swap test.

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TPD3S716-Q1: TPD3S716-Q1 Short to GND