CC2340R5: What changes are required in the SDK or application to use internal LFOSC for RTC in standby mode

ilanchezhian Thingalkodi

Part Number: CC2340R5
Other Parts Discussed in Thread: SYSCONFIG

Hi,

In our custom board , we forget to have LFOSC 32.678KHz xtal. So we are forced to use the Internal LFOSC. Could you please let us know, how it can be accomplished using simplelink_lowpower_f3_sdk_7_40_00_64 SDK

With Regards

Ilan

5 months ago

+1 Toby P 5 months ago

TI__Mastermind 31280 points

Hi,

You can set this in SysConfig.

After opening the .syscfg file of your CCS project, navigate to: "TI DEVICES" --> "Device Configuration" --> "Low Frequency Clock Source".

Then in the dropdown menu, select "LF RCOSC".

Thanks,
Toby

0 ilanchezhian Thingalkodi 5 months ago in reply to Toby P

Prodigy 210 points

Thank you, 2 things that solved the problem. Since we are using custom board and 32KHz xtal is is not present So after enabling the power saving logic worked. Also i found that -D POWER_SAVING flag is not enabled in my project settings.

Regards,

Ilan T

0 Toby P 5 months ago in reply to ilanchezhian Thingalkodi

TI__Mastermind 31280 points

Thanks for the update, glad to hear it seems to be working.

From your previous E2E post, I'd like to re-iterate:
Please consider the tradeoffs of using LFOSC vs LFXTAL, some details here: https://e2e.ti.com/support/wireless-connectivity/bluetooth-group/bluetooth/f/bluetooth-forum/1309385/cc2340r5-improve-accuracy-of-lfclk-derived-rtc-when-using-lfosc-as-source/4999160?tisearch=e2e-sitesearch&keymatch=lfosc#4999160

Bluetooth®︎

Bluetooth forum

CC2340R5: What changes are required in the SDK or application to use internal LFOSC for RTC in standby mode