TUSB2036 in self powered mode: What do I do with upstream Vbus signal?

Bernt Damm

Other Parts Discussed in Thread: TUSB2036

In previous hubs I have used in self powered mode,I had to add a transistor, driven by Vbus, and 1k5 resistor to pull the DP0 line hiugh on Vbus active.

How should I handle the incoming Vbus signal on the TUSB2036?

over 9 years ago

0 Joel Jimenez0 over 9 years ago

TI__Mastermind 18655 points

Hello Bernt,

The attached TUSB2036 reference design shows the correct way to implement the USB connection through Vbus detection.\

6Mhz Self-powered 3-port hub.pdf

0 Bernt Damm over 9 years ago in reply to Joel Jimenez0

Prodigy 70 points

Hello and thank you.

This is interesting but it differs from your other reference design.

I have attached it here.

Why would the transistor be required at all?

According to the datasheet, the DP0PUR pin will become active after the reset#.

So the 1k5 resistor will be active only when the hub is ready.

???

Regards

Bernt

TUSB2036 48Mhz Self-powered 3-port hub.pdf

0 Bernt Damm over 9 years ago in reply to Joel Jimenez0

Prodigy 70 points

Hello and thank you.

This is interesting but it differs from your other reference design.

(I have not suceeded in attaching it here) It is named 48Mhz Self-powered 3-port hub.pdf

Why would the transistor be required at all?

According to the datasheet, the DP0PUR pin will become active after the reset#.

So the 1k5 resistor will be active only when the hub is ready.

Can you please clarify the reason?

???

Regards

Bernt

0 Bernt Damm over 9 years ago in reply to Bernt Damm

Prodigy 70 points

it appears that I DID manage to attach the file I mentioned 2 messages up.

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TUSB2036 in self powered mode: What do I do with upstream Vbus signal?