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TS3USB221A equivalency to Physical disconnection

Other Parts Discussed in Thread: TS3USB221A, TUSB2036

We have a test jig that at some point have to disconnect our device from the computer USB (12Mbps variant) and than reconnect after performing a few tests. Currently, to emulate a physical disconnection we are using relays. It works as expected, but maybe a solution as the TI ts3usb221a would be a more reasonable one. What would be the differences between both scenarios: real physical disconnection and FET disconnection with the ts3usb221a. Our mains concern here is related to some current leakage as one of the tests that are performed is measuring a few microamps of consumption of the board.

PS: As we are are already going to use a hub as the TUSB2036 to connnect both the Jig and the tested device with a single USB connector, would be possible to control the HUB to emulate a disconnection of that port?

Regards,

Luis

  • Hello Luis,

        The main difference is the disconnection impedance, where you have absolute isolation for the physical disconnection meanwhile the FET disconnection provides a high impedance between the input and the output ( greater than 2.7 MOhm, which is the worst scenario). Regarding the leakage current during the FET disconnection, It should not be a problem, since the 2uA is a maximum value, only achieved under the worst operating conditions.

       Unfortunately there is no disconnection control on the TUSB2036.

    Best regards,

    Diego.