TCA6424A: unsed pins

Gaurav Gothoskar

Part Number: TCA6424A

Tool/software:

Hi,

what state should the unsed pin be? is it ok to keep them floating or will it cause false INT? optimal state to save power.

Thanks.

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 317320 points

The default configuration of all pins is as an input. They must not float, so you should connect them to a valid logic voltage, or configure them as outputs.

0 Tyler Townsend over 1 year ago

TI__Mastermind 48228 points

Hi Gaurav,

Unused pin configured as input could cause false INT yes.

Optimal state to save power is addition of a pull-up resistor to VCC.

A secondary option is to configure the floating pin as an output. But this will consume slightly more ICC in standby mode.

Please see this FAQ for additional information

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/797669/faq-can-i-leave-pin-floating-on-my-i2c-i-o-expander-or-i2c-switch-int-reset-port-i-o-ect?tisearch=e2e-sitesearch&keymatch=faq%3Atrue

Regards,

Tyler

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TCA6424A: unsed pins