TUSB8041 Hub Input Supply Current

Phil Cherry

Prodigy 50 points

Other Parts Discussed in Thread: TUSB8041

Hi, Can anyone advise / estimate what the VDD33 and VDD supply currents will be in the following configurations:

3.0 host / 1 SS Device, 3 HS Devices, Hub in U0

and

2.0 host / 2 HS Devices

I'm not sure how to estimate the likely load from data listed in section 7.7 of the datasheet.

Thanks,

Phil Cherry.

over 8 years ago

0 Elias Villegas M. over 8 years ago

TI__Guru* 76130 points

You can take as a reference the values for USB3.0 Host and 1 SS Device in U0 plus ~50mA extra in the VDD11 rail for the HS Devices.
Regards

0 Phil Cherry over 8 years ago in reply to Elias Villegas M.

Prodigy 50 points

Do you mean 50mA for each HS device or for all together?

Also, is this an answer to just:

3.0 host / 1 SS Device, 3 HS Devices, Hub in U0

or including the second hub:

2.0 host / 2 HS Devices

Kind regards,

Phil Cherry.

0 Elias Villegas M. over 8 years ago in reply to Phil Cherry

TI__Guru* 76130 points

Hello,
50mA for the three HS devices.
Anyway, I don't recommend you to take these numbers as a rule of thumb, current consumption will vary with temperature, layout, grounding...
My recommendation is to design your power budget according to the worst case scenario, you can also use a TUSB8041 evaluation module to have a reference.

Regards

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TUSB8041 Hub Input Supply Current