topic Directly connected output of the microprocessor B25 (RTC_XTALO) to the 0V8 power supply in i.MX Processors

Directly connected output of the microprocessor B25 (RTC_XTALO) to the 0V8 power supply

AndreyMyachkov — Fri, 14 Feb 2025 11:25:42 GMT

Have a nice day!

During a detailed study of the demo board electrical scheme for the IMX8MMini, I noticed that the output of the microprocessor B25 (RTC_XTALO) is directly connected to the 0V8 power supply.

Based on the above, please respond:

1) is this a mistake ?

2) is it allowed to connect the output of the RTC_XTALO microprocessor directly to the 0V8 power supply via a 0Ohm resistor ?

I think it's best to connect this pin B25 (RTC_XTALO) to the 0V8 power supply via a 1kOhm resistor !

What do you think about it ?

Looking forward to hearing from you.

Thanks a lot,

Best regards,

Andrey Myachkov

Re: Directly connected output of the microprocessor B25 (RTC_XTALO) to the 0V8 power supply

Oswalag — Tue, 18 Feb 2025 20:20:02 GMT

Hello.

It is correct, 0Ohm resistor is used for testing purposes on the EVK.

According to the datasheet, RTC_XTALO should be directly connected to VDD_SNVS_0P8, then 1k ohm is not necessary.

Regards.

Re: Directly connected output of the microprocessor B25 (RTC_XTALO) to the 0V8 power supply

AndreyMyachkov — Wed, 19 Feb 2025 10:32:14 GMT

Hi!

Thanks a lot for your reply.

Best regards.

Andrew