topic Re: i.MX8M Mini internal IO pullup/pulldown in i.MX Processors

i.MX8M Mini internal IO pullup/pulldown

haryanl — Fri, 05 Nov 2021 02:43:09 GMT

Hi Everyone,

1.) in 3.3V operating mode, I would like to know the typical value of the internal Pull-up/Pull-down resistor

According to the topic below, the value of the internal pull-down resistor is 20KΩ when there is no external resistor:
https://community.nxp.com/t5/i-MX-Processors/i-MX8M-Mini-pull-down-resistor-on-boot-pins/td-p/1026433

2.) According to ERR050080 in Errata IMX8MM_0N87W, "There is a degradation of the internal IO pullup/pulldown capability when the IO pads are continuously driven in the opposite logic level, for example, when internal pullup is enabled with external logic driving the pin low, and a 3.3V operating condition which limits the pads pullup/pulldown ability."
But when the PAD is driven at the same logic level, for example: when internal pullup is enabled with external logic driving the pin High, (Enable pin of another IC)
Is it possible to ignore degradation in this case?

Hope this helps,

Best regards,

Haryanl

Re: i.MX8M Mini internal IO pullup/pulldown

Yuri — Fri, 05 Nov 2021 05:01:06 GMT

@haryanl
Hello,

I think - yes - it is possible to ignore degradation, when the PAD is driven at the same logic level.

Regards,
Yuri.

Re: i.MX8M Mini internal IO pullup/pulldown

haryanl — Fri, 05 Nov 2021 07:20:12 GMT

Hi @Yuri

Our customer asked what is the value of the internal pull-up/down resistors, is there a Typical value for them?

hope for your help

Best Regards,

Haryanl

Re: i.MX8M Mini internal IO pullup/pulldown

Yuri — Fri, 05 Nov 2021 07:33:06 GMT

@haryanl
Hello,

It is hard to guarantee resistors values, nevertheless estimations
of 20K - 92K can be used.

Regards,
Yuri.

Re: i.MX8M Mini internal IO pullup/pulldown

haryanl — Fri, 05 Nov 2021 07:35:42 GMT

Thank for your support @Yuri

Regards,

Haryanl