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PMIC_ON_REQ Behaviour

Question asked by KRISHNAPRASADA ALADKA VENKATAKRISHNA on Oct 28, 2013
Latest reply on Feb 26, 2014 by Yixing Kong

Hi

 

I am designing a system with i.MX6 Dualite processor and external DC/DC Converters ( No PMU).

My system needs the Processor to turn ON automatically when the power is applied ( No Button press).

However I should be able to turn – off the processor via the switch connected to ON_OFF Button.

The system will be OFF for a specific duration and should turn ON again automatically..

Note that VDD_SNVS is always present.

 

I am making use of PMIC_ON REQ Signal along with a 555 timer to meet this requirement.

However my question is :

  1. Can the system come up automatically second time without pressing ON_OFF Button again?
  2. What are the criteria’s to assert “PMIC_ON_REQ”?
  3. Whether the PMIC_ON_REQ gets asserted/de-asserted only by ON_OFF Button press?
  4. Consider I turned off the unit by pressing ON_OFF Button. PMIC_ON_REQ = Low. When the system turns ON again automatically, Can it over drive PMIC_IN_REQ to High State from low state?
  5. Once SOC is powered up, will it change the state of  PMIC_ON_REQ from Low to High?

 

Please clarify,

Sincerely

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