PCA9534A: reference design and application note to planning GPIO extender function

Len Hsu2

Intellectual 2440 points

Part Number: PCA9534A

Hi team,

I have customer design PCA9534A and need some support for design.

He needs some data or document that about reference design and application note to planning GPIO extender function.

Can you help in this?

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 314270 points

There is nothing special about this I/O expander.

The power supply pin should have a decoupling capacitor.
The I²C bus needs pull-up resistors.
Unused inputs need a pull-up or pull-down resistor. (All I/Os are inputs after power up.)

0 Eric Hackett over 2 years ago in reply to Clemens Ladisch

TI__Guru 73542 points

Len,

Please let us know if you have any other questions.

Regards,

Eric Hackett

0 Len Hsu2 over 2 years ago in reply to Eric Hackett

TI__Intellectual 2440 points

Hi Eric,

Thanks for your help.

The customer had finished the schematic, can you help on review the schematic?

I will sent you the E2E message for you.

0 Tyler Townsend over 2 years ago in reply to Len Hsu2

TI__Mastermind 43773 points

Hi Len,

You can post the schematic here. Keep in mind that this is a public forum.

If you need to go private, please send the schematic to my email: t-townsend@ti.com or post on the internal forum.

Regards,

Tyler

0 Len Hsu2 over 2 years ago in reply to Tyler Townsend

TI__Intellectual 2440 points

Hi Tyler,

I'll sent it to you.

0 Tyler Townsend over 2 years ago in reply to Len Hsu2

TI__Mastermind 43773 points

Hi Len,

I will look at the schematic on email.

Regards,

Tyler

0 Len Hsu2 over 2 years ago in reply to Tyler Townsend

TI__Intellectual 2440 points

Hi Tyler,

Thanks for helping.

The customer finished the layout and needs to help on review.

Can you help on this? (U848)

PD515-MB-B-PCB-REVIEW-TI-V172.zip

Best Regards.

Len

0 Tyler Townsend over 2 years ago in reply to Len Hsu2

TI__Mastermind 43773 points

Hi Len,

No major concerns with this layout.

Regards,

Tyler

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PCA9534A: reference design and application note to planning GPIO extender function