i.MX Processors中的主题 Re: IMX8M-MINI internal RTC implementation

IMX8M-MINI internal RTC implementation

AMBh — Mon, 21 Aug 2023 12:02:46 GMT

Hi team,

I do have an application where I want to use internal RTC of IMX8M-mini controller. I have used Yocto setup for the same.

Can you support how I can use internal RTC in my application

Thanks,

Madhuri

Re: IMX8M-MINI internal RTC implementation

Bio_TICFSL — Mon, 21 Aug 2023 14:31:14 GMT

Hello,

The MX8M Mini does not have an internal 32k ring oscillator, and does not support the use of a crystal.

Please see the datasheet, Section 3.1.4:

The RTC_XTALI is used for low-frequency functions. It supplies the clock for wake-up circuit, power-down real time clock operation, and slow system and watch-dog counters. The clock input can only be connected to an external oscillator. RTC_XTALO should be directly connected to VDD_SNVS_0P8.

and Section 3.4.2:

An external 32.768 kHz oscillator is necessary.

Regards

Re: IMX8M-MINI internal RTC implementation

AMBh — Tue, 22 Aug 2023 05:42:52 GMT

Hi,

Thanks for the reply

Okay I got your point. I also used BD71847AMWV power management IC which has internal RTC. How to use it ?