i.MX6DQ: When to provide power with external 32KHz clock cirtuit

[norishinozaki]

Hello Champs,

From HDG, "Table 2-7. Oscillator and clock recommendations" wrote;

2. External kilohertz source

"The RTC_XTALI signal should not be driven if the VDD_SNVS_CAP supply is off"

Could you explain the purpose of this restriction?

My customer is thinking to use VDD_SNVS_IN from PF0100, dropping to 1.0V to provide power with the external 32KHz clock circuit.

Since VDD_SNVS_CAP is generated from VDD_SNVS_IN with some delay, might there be a condition which applies the above restriction?

Best regards,

Nori Shinozaki

[igorpadykov · Accepted solution]

Hi Nori

your precautions are justified, yes one needs first to

apply VDD_SNVS_CAP, then provide clock. If necessary one can

add delay to external 32KHz clock circuit.

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

[norishinozaki]

Hello Igor,

Thanks always!

Best regards,

Nori Shinozaki