LAUNCHXL-CC26X2R1: Setting CC26x2R1-LaunchPad to disable RAM retention in standby mode.

HANEUL JEONG

Prodigy 10 points

Part Number: LAUNCHXL-CC26X2R1
Other Parts Discussed in Thread: CC2652R, SYSCONFIG

Hello

I'm developing a ZED (Zigbee End Eevice) that runs on low power.

The library is using version 6.30.01.03 of the SimpleLink CC13xx CC26xx SDK.

I want to change or turn off the retention cycle of RAM.

So I know the following situation to solve the problem.

Standby without cache retention

SRAM retention operates at Full in Standby Power Mode

Standby Mode Power measurement data in SWRA625B

Ram retention in Standby mode measured by me

I searched the old data (CC26xx Driver Library - tirtos_full_2_15_00_17) and confirmed the information that AONWUCMcuSRamConfig in "aon_wuc.h" could do it, but I couldn't confirm it in CC13xx_CC26xx SDK - 6.30.01.03.

The last picture is the data I measured.

The RAM Retention cycle is displayed in units of 770 ms.

I would like to know how to change or turn off this cycle.

Thank you.

over 3 years ago

0 robin Moon over 3 years ago

Expert 1600 points

Part Number: CC2652R

we used to SDK 6.30 with zigbee.

we want to adjust ram retention period disable ram retention to reduce peak voltage.

I found how to disable it in the link below, but I can't find it in the latest SDK(SDK 6.30)

https://e2e.ti.com/support/wireless-connectivity/bluetooth-group/bluetooth/f/bluetooth-forum/1037540/cc2640r2f-disabling-ram-retention/3836180?tisearch=e2e-sitesearch&keymatch=sram%20retention%20time#3836180

please let me know that.

thanks

0 Ryan Brown1 over 3 years ago

TI__Guru**** 223317 points

Hello Haneul, Robin,

The latest RAM application documentation is captured in the BLE5-Stack User's Guide. By default, Z-Stack accounts for the lowest Power Consumption configuration when using a sleepy ZED project for which BOARD_DISPLAY_USE_UART is removed and CUI_DISABLE is defined. The pulses you are observing are likely unavoidable recharge pulses as discussed in SWRA478. You will also observe occasional Data Requests being transmitted from a ZED which has joined a network, these are controlled by the poll rate established in SysConfig.

Regards,
Ryan

0 HANEUL JEONG over 3 years ago in reply to Ryan Brown1

Prodigy 10 points

Thank you for answer.

Through that document, I checked how to Disable Retention through RAMCFG Register.

Among the ZStack examples, I am testing based on ZED_ZONE Application.

Retention Disable is made to be executed after zone registration is complete.

However, the phenomenon of rejoining appears as follows.

Can you tell me why?

0 Ryan Brown1 over 3 years ago in reply to HANEUL JEONG

TI__Guru**** 223317 points

SRAM has to be retained for the sleepy ZED to continue normal operation after waking from Standby Mode. Keep in mind that cache RAM is separate from SRAM. Since the added API does not allow for this to occur, a SW reset likely takes place which triggers the Rejoin process. As mentioned before, the sleepy ZED examples are already optimized for the lowest power operation so modifications to SRAM are not necessary. You can increase the SysConfig POLL_RATE period if you would like for the sleepy ZED to wake up less often.

Regards,
Ryan

0 HANEUL JEONG over 3 years ago in reply to Ryan Brown1

Prodigy 10 points

Thank you

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LAUNCHXL-CC26X2R1: Setting CC26x2R1-LaunchPad to disable RAM retention in standby mode.