TUSB4041I: request schematic review

TS Yang

Part Number: TUSB4041I

Hi,

One of our big customer HITACHI requested schematic review.

Please help us with there's any problem on their schematic.

Due to HITACHI's internal security procedure problem, it is difficult to export the schematic, so we got the sch image file as below.

thanks,

over 6 years ago

0 Michael Tan over 6 years ago

TI__Expert 8420 points

Dear customer, Thank you for your interest in a Texas Instrument’s solution. Due to the Christmas/New Year holidays, our response time is likely to be longer than usual. Rest assured we have received your question and want to close it as soon as possible. If this is truly urgent, we suggest you work through your local support and/or procurement channels.

0 JMMN over 6 years ago

TI__Guru 60865 points

Hello,

We recommend stronger pullup on SDA/SCL if an external EEPROM or SMBUS host is used. Also, USB_VBUS to the hub should have a resistor divider network with a 90.9K and 10K resistors.

Rgards,
JMMN

0 TS Yang over 6 years ago in reply to JMMN

Genius 4800 points

Hello,

The pull-up resistance of the development board is 4.7K.

What is the higher resistance and what is the basis of the explanation?

thanks,
TS

0 TS Yang over 6 years ago in reply to JMMN

Genius 4800 points

would you please let us know how strong the pullup is, and please explain the reason?

0 TS Yang over 6 years ago in reply to TS Yang

Genius 4800 points

I'm still waiting your advice. Can you give me some more information about higher pullup resistor value.

thanks,
TS

0 JMMN over 6 years ago in reply to TS Yang

TI__Guru 60865 points

The I2C pins require higher pullup resistor values than the general configuration pins to meet I2C bus specifications.

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TUSB4041I: request schematic review