iMX8- low power/deep sleeping mode

[borisberman]

Hi,

Our new project on basis  iMX8m, should include low power/deep sleeping mode with desired power consumption less than 10 mW

For its implementation we intend to provide  followings steps:

        1.  To set PIMIC in Sleeping Mode (deasserted   PMIC_ON_REQ signal from iMX8M to PWRON pin of PIMIC), so                that only the power for the SNVS domain remains on for iMX8M. ( according to data sheet this mode called                       SNVS Mode, see paragraph 3.1.6)

        2.  To set DDR Memories in the Self Refresh Mode.

       3.  iMX8M will be wake Up from low power/deep sleeping mode through ONOF signal, and after this it will assert                  PMIC_ON_REQ   signal  for PIMIC

Please confirm that iMX8M support those steps, and  after wake-up from SNVS Mode it will be able to continue programs from the same point without the system reset.

Thank You,

Boris 

[borisberman]

Hi Igor,

Thank you for Your fast answer!

From your answer I still did not understand, can I exit from SNVS/RTC mode and continue programs from the same point that  before entered in this mode.
I would like to note that for data retain the external LPDDR4 memory i mean to enter in the self-refresh mode, but necessary power supply for the proper SELF REFRESH operation, will be supplied on the external LPDDR4 memory only, and no on the DRAM controller (VDD_DRAM power domain) and  NVCC_DRAM power domain of iMX8M.

Thank You,

Boris

[igorpadykov]

Hi Boris

yes one can exit from SNVS/RTC mode and continue programs from the same

point that before entered in this mode.

Best regards
igor

[borisberman]

Hi Igor,

Thank you for cooperation!

Best Regards,

Boris

[igorpadykov]

Hi Boris

yes ON/OFF  pin can wake up the system from SNVS mode.

Regarding DDR Memories, according to sect.3.1.6 Power modes i.MX8MDQ Datasheet :

SNVS Mode: This mode is also called RTC mode. Only the power for the SNVS domain remains
on to keep RTC and SNVS logic alive.

https://www.nxp.com/docs/en/data-sheet/IMX8MDQLQCEC.pdf

for deep sleep mode use cases one can look on AN12118 i.MX8M Quad Power Consumption Measurement

https://www.nxp.com/docs/en/nxp/application-notes/AN12118.pdf 

Best regards
igor
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[borisberman]

Hi Igor,

Thank you for Your fast answer!

From your answer I still did not understand, can I exit from SNVS/RTC mode and continue programs from the same point that  before entered in this mode.
I would like to note that for data retain the external LPDDR4 memory i mean to enter in the self-refresh mode, but necessary power supply for the proper SELF REFRESH operation, will be supplied on the external LPDDR4 memory only, and no on the DRAM controller (VDD_DRAM power domain) and  NVCC_DRAM power domain of iMX8M.

Thank You,

Boris