topic Re: PCA9535A GPIO expander in Other NXP Products

PCA9535A GPIO expander

arios100 — Tue, 22 Mar 2022 04:56:15 GMT

Hello,

I have the reset signal going to the PCA9535A reset input being driven by a 3.3V signal but the PCA9535A is being powered by 1.8V VDD. Is this allowed? The datasheet says its 5V tolerant.

arios100_0-1647924952059.png

Re: PCA9535A GPIO expander

guoweisun — Tue, 22 Mar 2022 05:07:36 GMT

Please get note that the VDD range is from 2.3V to 5.5V, the 1.8V can't be used.

Re: PCA9535A GPIO expander

arios100 — Tue, 22 Mar 2022 05:12:19 GMT

the PCA9539A is from 1.65 to 5.5V see below.

arios100_0-1647925879824.png

Re: PCA9535A GPIO expander

guoweisun — Tue, 22 Mar 2022 05:21:35 GMT

Understand, please connect the RESET pin to VDD.

Re: PCA9535A GPIO expander

arios100 — Tue, 22 Mar 2022 05:30:38 GMT

I don't have a 1.8V output reset signal, only have the 3.3V reset signal.

Are you saying that reset input is not 3.3V tolerant when gpio's VDD is 1.8V?