CCS/CC2640R2F: Lowering the power consumption in Micro Eddystone Beacon

_Yoram_Grinberg_

Part Number: CC2640R2F
Other Parts Discussed in Thread: LAUNCHXL-CC2640R2,

Tool/software: Code Composer Studio

For a project powered by energy harvesting from a small electromagnetic generator, I'm experimenting with LAUNCHXL-CC2640R2 board, with code based on simplelink_cc2640r2_sdk_2_30_00_28\examples\rtos\CC2640R2_LAUNCHXL\blestack\micro_eddystone_beacon

I get around 80uA in sleep mode (in between TX events), and a few mA in TX.

1. How do I configure the TX power in the firmware?

2. CC2640R2F datasheet states "Standby: 1.1 uA (RTC Running and RAM/CPU Retention)". How do I modify the firmware to achieve this low current?

over 5 years ago

0 Markel Robregado over 5 years ago

Guru 86765 points

Hi Yoram,

You need to remove all jumpers and power the board externally. Also, you need to shutdown the SPI External Flash by calling Board_shutDownExtFlash() at initialization.

-kel

0 Eirik V over 5 years ago

TI__Guru 56590 points

Also refer to the Measuring CC13xx and CC26xx current consumption (Rev. D) app note found here:

http://www.ti.com/product/CC2640R2F/technicaldocuments#doctype1

0 _Yoram_Grinberg_ over 5 years ago in reply to Markel Robregado

Prodigy 130 points

Of-course all jumpers removed (otherwise it's around 30mA).

Adding Board_shutDownExtFlash() reduced the standby current from 80uA to 70uA, which wasn't much, but gave me the idea to disable the UART (used in this example code for periodic status display), by removing it's initialization and use.

Removing the UART code reduced the standby current to around 2uA, which is very good.

Thanks.

Bluetooth®︎

Bluetooth forum

CCS/CC2640R2F: Lowering the power consumption in Micro Eddystone Beacon