CCS/LAUNCHXL-CC26X2R1: Power consumption at low power mode of CC26x2

minghao Cheng

Intellectual 870 points

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

Tool/software: Code Composer Studio

Hi there,

I'm currently using CC26X2R1 LP to develop a project.

The working routine works as follow:

RTC trigger -> Sensor controller ADC sampling -> Main core wakes up and processing -> BLE transmission.

When i'm trying to use Energy trace to estimate the current consumption, I found that in sleep mode, the current is always around 275uA.

Then I imported the empty project and deleted the LED blinking code. Besides, I added a Idle task and put Power_idleFunc(); Into the Idle task.

However, the current is still around 275uA.

The screenshot shows my edited edition of empty project and the current from EnergyTrace.

By the way, I was wondering if the main core can wake up from standby mode via the sensor controller event or not, and if not, which mode can give me the lowest power consumption in this case?

Configuration:

SDK: 3.10.01.11

CCS: 9.0.1.00004

2pin-Jtag onboard debugger.

Free-run. (Not resume)

No extra circuit or wires are connected to the board.

Thanks a lot

over 6 years ago

0 Simon J over 6 years ago

TI__Genius 11810 points

Hi,

Which version of LAUNCHXL-CC26X2R1 do you have? If you have the pre-release version EnergyTrace will not be accurate enough to measure standby current.

-Simon

0 minghao Cheng over 6 years ago in reply to Simon J

Intellectual 870 points

Hi Simen

Sorry for the delay.

The version is HW rev :B, FW SDK 2.40 1911

0 Simon J over 6 years ago in reply to minghao Cheng

TI__Genius 11810 points

Hi,

Then please verify that the debug interface of CC2652R is powered off while you measure current; after you have initialized ET from CCS, reset CC2652R by using the on-board reset button, then redo you ET measurement.

-Simon

0 minghao Cheng over 6 years ago in reply to Simon J

Intellectual 870 points

Hi Simon,

I followed your instructions and this is what I get with empty project.

It seems there would be a peak every one second. Do you have any idea what it is ?

0 Simon J over 6 years ago in reply to minghao Cheng

TI__Genius 11810 points

Hi,

This is the re-charge current of VDDR. When the device is in standby the internal LDO (or DCDC-converter) that normally powers VDDR is shut off save power and VDDR is power directly from the VDDR bulk capacitor. When the voltage falls below a certain threshold, the LDO (or DCDC-converter) will re-charge the bulk capacitor to a higher voltage level. This is the current spikes you are seeing.

-Simon

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CCS/LAUNCHXL-CC26X2R1: Power consumption at low power mode of CC26x2