TUSB2046B: regulations(provision) between VBUS↑(rising up) and D±↑(rising up)

Hirotaka Matsumoto

Part Number: TUSB2046B

Hi all

Would you mind if we ask TUSB2046B?

There are regulations(provision) between VBUS↑(rising up) and D±↑(rising up).

Is there regulations(provision) about start time?
We recognize that termination time is 100ms.
If you know it, could you let us know like as XXms～100ms?

Kind regards

Hirotaka Matsumoto

over 8 years ago

0 Joel Jimenez0 over 8 years ago

TI__Mastermind 18655 points

Hello Matsumoto-san,

The connection event timing requirements are defined by the USB 2.0 spec:

Regards

0 Hirotaka Matsumoto over 8 years ago in reply to Joel Jimenez0

Guru 27585 points

Joel san

Thank you for your reply!
And we are sorry that our explanation is not enough.

We recognize that the maximum Δt2 is 100ms.
So, we would like to know how much the minimum Δt2 time is.
Is there the minimum specified time or not?
Is 0ms OK??
If you know it, could you let us know?

Kind regards,

Hirotaka Matsumoto

0 Hirotaka Matsumoto over 8 years ago in reply to Hirotaka Matsumoto

Guru 27585 points

Joel san

If you know the minimum Δt2 time, could you let us know?

Kind regards,

Hirotaka Matsumoto

0 Hirotaka Matsumoto over 8 years ago in reply to Hirotaka Matsumoto

Guru 27585 points

Joel san

We are sorry to rush you however could you give us the reply?
Of course, if you don't have the reply, it is no matter.

Kind regards,

Hirotaka Matsumoto

0 Joel Jimenez0 over 8 years ago in reply to Hirotaka Matsumoto

TI__Mastermind 18655 points

Hello Matsumoto-san,

Sorry for the delayed response. The only time requirement for the device’s internal power rail to stabilize and for D+ or D- to reach VIH is that ∆t2 must be less than 100 ms for all hub and device, therefore, it is ok if the time is 0ms.

Regards

0 Hirotaka Matsumoto over 8 years ago in reply to Joel Jimenez0

Guru 27585 points

Joel san

Thank you for your reply.
OK, we got it.

Kind regards,

Hirotaka Matsumoto

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TUSB2046B: regulations(provision) between VBUS↑(rising up) and D±↑(rising up)