TUSB1310A VBUS Input & PWRPRESENT Output

1859464

Other Parts Discussed in Thread: TUSB1310A

Hello,

We are considering our system design options for VBUS sensing into our FPGA, as so have the following questions:

1. Within the TUSB1310A, is the VBUS input connected to any USB 3 related logic/analog, or is it that ONLY the PWRPRESENT output is a function of the VBUS input?

2. Is the TUSB1310A VBUS input fed into an internal comparator, and the output of that comparator is output as PWRPRESENT? If so, what threshold voltage is the comparator set to use (in post 90.9Kohm/10.0Kohm external resistor divider domain) ?

Thanks & Regards,

over 9 years ago

0 Gerardo over 9 years ago

TI__Genius 11280 points

Hello KT,
Please see the answers below.

1. Yes, the VBUS is tied internally to analog/digital circuitry.
2. I don't know exactly the threshold voltage used, but a value in the range 0.5v - 1v would be fine.

Regards,
Gerardo

0 1859464 over 9 years ago in reply to Gerardo

Intellectual 575 points

Hi Gerardo,

Thanks for info. Some follow-up:

1. What TUSB1310A SuperSpeed logic/analog does VBUS input affect? This is not the answer we were anticipating. We are NOT using the USB2/ULPI portion of the TUSB1310A and thus are leaving it disconnected on both DP/DM and ULPI side with the exception of the REFCLKSEL0/1 strap option.

Thanks & Regards,

0 1859464 over 9 years ago in reply to 1859464

Intellectual 575 points

Hi Gerardo,

Were you able to dig up any info regarding my Dec 2 question?

Regards,

Interface

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TUSB1310A VBUS Input & PWRPRESENT Output