i.MX ProcessorsのトピックRe: i.MX93/PCA9451 Power Control Using Slide Switch

i.MX93/PCA9451 Power Control Using Slide Switch

tkato — Thu, 04 Dec 2025 08:09:34 GMT

Hello,

I am designing a custom board using i.MX93 and PCA9451. On the EVK, I noticed that the ONOFF pin is connected to a push button for power control.
In my design, I would like to use a slide switch instead of a push button for power control. Could you provide any design examples for this approach, or explain how it should be implemented?

Here is my current idea:

Pull up the ONOFF pin of i.MX93 to the power rail.
Leave the PMIC_ON_REQ output of i.MX93 floating, and connect the slide switch to the PMIC_ON_REQ input of PCA9451.
Connect the PMIC_STBY_REQ output of i.MX93 to PCA9451.

Any guidance or recommendations would be greatly appreciated.

Thank you for your support.

Best regards,
tkato

Re: i.MX93/PCA9451 Power Control Using Slide Switch

Rita_Wang — Mon, 22 Dec 2025 09:34:01 GMT

Sorry for miss your thread, I will confirm it for you and will give you reply tomorrow.

Re: i.MX93/PCA9451 Power Control Using Slide Switch

Rita_Wang — Tue, 23 Dec 2025 11:22:24 GMT

This is not recommended, ONOFF pin has many function which is not on PMIC_ON_REQ pin, for example, 5s mandatory power-off, power-off interruption and so on.

anyway you can use PMIC_ON_REQ pin to implement simple power-up and power-down as you design.

Any questions contact us freely.