TCAL6408: How to set GPIO output into open drain output?

Oliver Lin

Expert 3255 points

Part Number: TCAL6408

Hi team,

Customer has a requirement to put all pin into output open drain.

I am check register 0x4F, but not able to understand meaning well, there's only bit-0 can be modified.

Does this bit affect from P0 - P7? Or only P0?

I am also checking the thread below, does this device need to make the same setting as mentioned from the thread?

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/811376/faq-can-i2c-io-expanders-be-used-in-an-open-drain-configuration

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 260250 points

The datasheet says: "The output port configuration register selects port-wise push-pull or open-drain I/O stage."

Here, "port" means all eight pins.

0 Tyler Townsend over 1 year ago

TI__Mastermind 27353 points

Hi Oliver,

I agree with Clemens. Register 0x4F only represents 1 bit ODEN-0. This bit is associated with a single port either port 0 which contains eight separate p-port GPIOs (P0 - P7).

Regards,

Tyler

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TCAL6408: How to set GPIO output into open drain output?