TUSB319-Q1: Not detecting properly

Hello,

Can you provide the schematic for your TUSB319-Q1 application so we can review that and make sure it is all setup correctly?

When you say you do not have any pullups on ID or DIR, do you mean you are not pulling these pins up with a resistor?

Thanks,

Ryan

Hello,

I don't see PU on the ID and DIR pin, like you indicated. The ID pin and DIR pin must be PU to 3.3V with a 200KOhm PU.

Can you check the voltage of the CC pins before any type-C connection is made, to ensure the CC pins are providing the correct voltage?

Do you have any other components on the CC lines? I.E ESD diodes, resistors, etc?

Thanks,

Ryan

I added 300k pullups offboard but did not see a change in behavior - the pins are already high. 

The CC pins without any usbc connection are both 4.3V

I do have an esd diode (AQ3045-01ETG) on cc lines but nothing else. 

Hello,

Can you try removing the ESD diodes and seeing if that has any effect?

Morgan Novak said:

I added 300k pullups offboard but did not see a change in behavior - the pins are already high. 

These pins are open-drain, so an external PU is needed. If these pins were high before adding these PU then there must have already be PU somewhere on the board.

Morgan Novak said:

CC1 goes to 4.3V, CC2 is 3.7V, DIR is 3.9V, ID is 3.5V. I do not have any pullups on ID or DIR.

I remove usbc device and plug in the other way. 

CC1 goes to 3.7V, CC2 is 4.3V, DIR is 3.9V, ID is 3.5V. I do not have any pullups on ID or DIR.

When a device is successfully connected, we would expect both the CC pins to have a much lower voltage, with one of them being down to 0V. If that's not the case, then either the CC pins are not connected correctly, or CC negotiation is failing.

Thanks,
Ryan

Circuit works fine on another board. Seems that this chip is just cooked

Hi Morgan,

Understood. I checked and the clamping voltage on the ESD diode you used is 12V. Maybe it was ESD damage that didn't clamped due to being too low a voltage?

Thanks,

Ryan