What is the lowest power state for LPDDR SDRAM?

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What is the lowest power state for LPDDR SDRAM?

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nathanpalmer
Contributor IV

I have a legacy design that includes an iMX27 and LPDDR.  I am trying to take some measurements of the system power with various components powered off (or close to it) to calculate board overhead.  

I would like to disable the SDRAM, but I don't know if just not configuring it is enough to set it in the lowest power mode.  I am running application code from internal SRAM so I don't need the SDRAM at all.  How do I power it off (or close to off) from the iMX27?  Is there a mode I can put the SDRAM in that is essentially off?

Thanks!

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Yuri
NXP TechSupport
NXP TechSupport

Please use section 18.4.5 (Low Power Operating Modes) of the i.MX27 Reference Manual.
You can try Self Refresh Mode (section 18.4.5.1 Self Refresh Mode for SDRAM/LPDDR Devices)
or

Precharge Power Down Mode (section 18.4.5.3 Precharge Power Down Mode).

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Yuri
NXP TechSupport
NXP TechSupport

Please use section 18.4.5 (Low Power Operating Modes) of the i.MX27 Reference Manual.
You can try Self Refresh Mode (section 18.4.5.1 Self Refresh Mode for SDRAM/LPDDR Devices)
or

Precharge Power Down Mode (section 18.4.5.3 Precharge Power Down Mode).

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