CC2640R2F: Disabling RAM Retention

Joshua Damman

Part Number: CC2640R2F

Hi,

I am working on measuring standby current for the CC2640R2F using its launchpad. I wanted to disable RAM retention for my measurements and I found the function "AONWUCMcuSRamConfig" that I think I can use to disable the RAM retention. This function is in the aon_wuc.h file.

In main() of the simple_peripheral example I call this function as shown below to disable (0x0 input) or enable (0xF input) RAM retention:

When I do this, however, I do not see any significant difference in my standby current measurements. I think when I measured it yesterday both were around 1.3uA average standby. I was expecting the standby current to drop by a significant and measurable amount. Is this correct? Or am I not disabling RAM retention correctly? If this is the case, any guidance on disabling the RAM retention would be greatly appreciated.

Thanks,

Josh

over 4 years ago

+1 daniel_o over 4 years ago

TI__Genius 10680 points

Josh,

From the CC2640R2 TRM chapter 7.8 SRAM:

Although retention can be configured in 4KB blocks, this will not give any noticeable reduction of current consumption. It is thus recommended to retain the whole SRAM at all times.

It looks like you are correctly disabling SRAM retention, but you shouldn't expect to see much of a power reduction based on the TRM.

Regards,

Daniel

0 Joshua Damman over 4 years ago in reply to daniel_o

Prodigy 30 points

Thank you!

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CC2640R2F: Disabling RAM Retention