PCA9548A: SCH review

Lisa Xu

Part Number: PCA9548A

Dear TI Team:

We have a switch with many I2C/SMB device, we use PCA9548APWR& PCA9546APWR for I2C SW/Muliplex.

It is my first to design so many I2C device, so pls help review the I2C tree and SCH.Thanks!

Best Regards

Lisa

4 months ago

+1 Alex Vish 4 months ago

TI__Genius 10552 points

Hi Lisa,

I have responded via email.

Regards,

Alex

0 Lisa Xu 4 months ago in reply to Alex Vish

Intellectual 305 points

Hi Alex:

I have replied a email to you yesterday and have some questions need you help,Thanks!

Best Regards

Lisa

0 Alex Vish 4 months ago in reply to Lisa Xu

TI__Genius 10552 points

Hi Lisa,

I have responded. Apologies for the delay.

Regards,

Alex

0 Lisa Xu 3 months ago in reply to Alex Vish

Intellectual 305 points

Hi Alex:

Forgot to ask you why the SC/SD shoud be pull up when no use?

Best Regards

Lisa

+1 Alex Vish 3 months ago in reply to Lisa Xu

TI__Genius 10552 points

Hi Lisa,

The SCx and SDx pins of the PCA9548A should be pulled up even when not in use due to the nature of the I2C protocol and the design of the PCA9548A itself.

It's recommended to use pull-up resistors even when not in use to ensure that the I2C bus lines are at a defined voltage level, preventing them from floating which could lead to erroneous data transmission or device malfunction.

Regards,

Alex

0 Lisa Xu 3 months ago in reply to Alex Vish

Intellectual 305 points

Hi Alex:

Got it, Thanks

Best Regards

Lisa

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PCA9548A: SCH review