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USB hosts hubs transceivers Forum Discussions

TeMa_2997106
Level 6
10 likes received 10 solutions authored 250 replies posted
Level 6

Can VBUSPOWER be directly connected to VCC (3.3V)?

I want to build in HX2LP inside the Host PC. Therefore, there is no VBUS on the system.

Thanks,
Tetsuo

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1 Solution
Ajeethkumar
Moderator
Moderator 10 likes given 100 replies posted 100 sign-ins
Moderator

Hi Tetsuo-san,

Yes. As VIL for HX2LP is 2 to 5.25 volt, you can connect VBUSPOWER to VCC(3.3V) for your embedded hub application. I recommend you to connect VBUSPOWER to 3.3V via a 15K resistor.

Thanks,
Ajeeth

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4 Replies
Ajeethkumar
Moderator
Moderator 10 likes given 100 replies posted 100 sign-ins
Moderator

Hi Tetsuo-san,

Yes. As VIL for HX2LP is 2 to 5.25 volt, you can connect VBUSPOWER to VCC(3.3V) for your embedded hub application. I recommend you to connect VBUSPOWER to 3.3V via a 15K resistor.

Thanks,
Ajeeth

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TeMa_2997106
Level 6
10 likes received 10 solutions authored 250 replies posted
Level 6

Ajeeth-san,

Why does it need resistor?

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Ajeethkumar
Moderator
Moderator 10 likes given 100 replies posted 100 sign-ins
Moderator

Tetsuo-san,

It is a pull-up resistor(to limit the current drawn by the Microcontroller input pin) for the HX2LP input pin.

Thanks,
Ajeeth

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TeMa_2997106
Level 6
10 likes received 10 solutions authored 250 replies posted
Level 6

Ajeeth-san,

Thank you for your comment again. I could understand.

Thanks,

Tetsuo