TUSB2077A: Is TUSB2077A schematic correct ?

Vincent Chen46

Prodigy 220 points

Part Number: TUSB2077A

Hi,

I am designing a 7 port USB Hub with TUSB2077A USB Hub controller,

anyone who can help to double check it ? thanks a lot !

BR,

Vincent.

6574.USB Hub.pdf

over 5 years ago

0 Brian Zhou over 5 years ago

TI__Guru*** 145915 points

we are reviewing the schematic and will give feedback soon

0 Brian Zhou over 5 years ago in reply to Brian Zhou

TI__Guru*** 145915 points

Vincent;

couple of questions here:

1: for crystal you need to connect both pin 44 and 45.

2: For BUSPWR, you need to pull high to 3.3v, not 5v

3: it seems you designed a ganged self powered system, where do you get Vcc5?

0 Vincent Chen46 over 5 years ago in reply to Brian Zhou

Prodigy 220 points

Hi, Brian,

Thanks a lot, I would like to use 48MHz oscillator，Which ones need attention？

This Hub controller is one of onboard devices, carrier board has 5V power source,

In addition to the above question, are there any error in schematic ?

BR,

Vincent.

0 Brian Zhou over 5 years ago in reply to Vincent Chen46

TI__Guru*** 145915 points

it's fine to use 48Mhz oscillator.

For power supply, you use DVcc3.3 for device supply and DVcc3.3 is from Vcc3.3. and some of the pin is pullup to Vcc3.3, there could be power sequence issue. All those control pins need to pull up DVcc3.3?

0 Vincent Chen46 over 5 years ago in reply to Brian Zhou

Prodigy 220 points

Hi, Briam,

Thanks a lot, I'll modify my circuit.

BR,

Vincent.

0 Vincent Chen46 over 5 years ago in reply to Brian Zhou

Prodigy 220 points

Thanks a lot

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TUSB2077A: Is TUSB2077A schematic correct ?