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 :
Please clarify,
Sincerely
Hi,
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Thanks,
Yixing
Hi,
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Thanks,
Yixing
More useful info about PMIC_ON_REQ: https://community.freescale.com/docs/DOC-97660?et=watches.email.document
Best regards.
Jorge.
Hi,
1. Yes. As long as the processor start-up sequence is followed, the voltage levels are met and the POR_B signal is released after the power up sequence has finished, the processor will turn on.
2. PMIC_ON_REQ is a processor signal that turrns on the PMIC, but it actually doesn't affect the processor turn-on. The signal you should be looking at is POR_B. As I mentined, it must be asserted right after the power-up sequence finishes. You will need to control it with a voltage level equal to VDD_SNVS_IN, since this is the reference voltage of POR_B.
3. Yes, PMIC_ON_REQ is asserted with an ONOFF button press.
4. Not sure I understand this question. If the info above is not enough and you still need an answer on this, could you please elaborate?
5. PMIC_ON_REQ signal will stay high as long as the processor is on, and will go low when the system requires to turn off or go to sleep.
Best regards.
Jorge.
Table 60-3, Power Mode Transitions, in i.MX 6Dual/Quad Reference Manual gives some good info about this.
And for i.MX 6DualLite, it's Table 59-1 in DualLite/Solo ref. manual.