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TUSB320: Threshold for voltage on sink CC pins

Masashi Mineda
Intellectual 790 points

Part Number: TUSB320HA

Dear Sirs and Madams,

We are considering the TUSB320 and would like to confirm for the voltage on the CC pin.

I understand that the datasheet specs are as follows:

How should we consider the conditions of "0.61V or more and less than 0.7V" and "1.16V or more and less than 1.31V"?

Although the USB standard specifies a threshold value, the TUSB320 data sheet does not include a threshold value, so I asked this question.

(1)

Does TUSB320 have similar thresholds as the USB specification?

Or are these voltage range of this device "undefined"?

(2)

I understand that it is an "Unattached State (OUT1 and OUT2 are 'H')" when it is less than 0.25V, but is that correct?

Or does it need to be less than 0.2V, which is the USB specification threshold or 0.15V of max voltage?

Regards,

MM

  • +1
    TI__Mastermind 24630 points

    Hi MM,

    Masashi Mineda said:
    How should we consider the conditions of "0.61V or more and less than 0.7V" and "1.16V or more and less than 1.31V"?

    Those states are undefined for our part. If you are operating within those voltage levels, we cannot guarantee the TUSB320 will detect the correct current mode.

    Masashi Mineda said:
    Does TUSB320 have similar thresholds as the USB specification?

    I checked with systems on this and the thresholds in the TUSB320 are likely similar to those in the USB spec. We cannot say for certain whether they are exactly the same because we only guarantee the Min/Max ranges shown in the datasheet.

    Masashi Mineda said:
    I understand that it is an "Unattached State (OUT1 and OUT2 are 'H')" when it is less than 0.25V, but is that correct?

    The cutoff threshold between unattached and default states will be somewhere between 0.25V and 0.15V. This threshold is likely around 0.2V as shown in the spec.

    I recommend staying within the datasheet ranges to ensure you are detecting the correct current mode.

    Best,

    Shane

  • 0 in reply to Shane Hauser
    Intellectual 790 points

    Hello Shane,

    Your answer is very helpful, especially since it wasn't mentioned in the datasheet regarding the CC voltage in the "Unattached State".

    Regards,

    MM