topic Re: PMIC: PCA9450 in i.MX Processors

PMIC: PCA9450

saidjazouly — Sun, 24 Jan 2021 21:39:06 GMT

Hello,

We designed a customer's solution based on i.MX8M processor and using the PCA9450 as the PMIC.

Our questions is:

Are the PCA9450's registers volatile after power cycling the board or do they keep their last modified values?

Thanks for your help!

Re: PMIC: PCA9450

igorpadykov — Sun, 24 Jan 2021 23:16:12 GMT

Hi saidjazouly

not sorry, in general case registers value are not preserved. Datasheet can be found on link

https://www.nxp.com/products/power-management/pmics-and-sbcs/pmics/power-manage-ic-pmic-for-i-mx-8m-mini-nano-plus:PCA9450?tab=Documentation_Tab

Best regards
igor

Re: PMIC: PCA9450

saidjazouly — Sun, 24 Jan 2021 23:20:13 GMT

Thanks for your help Igor!

Re: PMIC: PCA9450

saidjazouly — Wed, 27 Jan 2021 00:15:20 GMT

Hi Igor,

our customer is wondering if there is a way to preserve the register values through power-cycles. The reason being at board power-up, the new PMIC settings should take effect even before the i.MX8 has a chance to access in read/write the PMIC registers.

Is there anyway to preserve those registers new values and to only change them when the i.MX decides to do so?

Thanks for your help.

Re: PMIC: PCA9450

igorpadykov — Wed, 27 Jan 2021 04:34:05 GMT

Hi saidjazouly

> way to preserve the register values through power-cycles. The reason being at board power-up,
>the new PMIC settings should take effect even before the i.MX8 has a chance to access in read/write
>the PMIC registers.

default register values are hardcoded so I am afraid it is not feasible, sorry.

Best regards
igor