RTOS/CC1352R: Too high current consumption in Standby mode CC1352R

Alessandro Rossi21

Part Number: CC1352R

Tool/software: TI-RTOS

Hello,

I am developing an Ultra Low Power project which has to sample 2 SPI sensors at 20 Hz with CC1352R. For power evaluation I am starting from an empty TI-RTOS based project with the adding of only the Sensor Controller at 20 Hz which, for now, is doing nothing more than sending an interrupt every 40 sec to the main CPU.

since the main loop while(1) contains only a sleep(1) instruction, I suppose to have a standby current consumption, but the measurement with an oscilloscope gives 600 uA (more similar to the Idle one)

the power polocy is explictly called in main_tirtos.c, just after Board_init():

Power_setPolicy(PowerCC26XX_standbyPolicy);
Power_enablePolicy();

how can I reduce the this current consumption? Is my device actually going in standby mode?

thanks in advance

over 5 years ago

0 AB over 5 years ago

TI__Mastermind 19125 points

Hello Alessandro,

I believe the problem here is the way you are calling the sleep command. Try calling sleep(BIOS_WAIT_FOREVER).

Regards,
AB

0 TER over 5 years ago in reply to AB

TI__Guru**** 317180 points

If that doesn't work, also look into the peripherals defined in the empty project and how you use the board. Try to not define the UART, SPI interface etc if you are not using them since we have seen before that a floating input could cause higher than expected current.

0 Alessandro Rossi21 over 5 years ago in reply to AB

Prodigy 200 points

Thanks for the advice. I’ve tried this and also tried to use a semaphore_pend(BIOS_WAIT_FOREVER) in main posted in the sensor controller interrupt, but the current consumption is still the same. Is there any possibility that by calling sleep the MCU is entering IDLE mode instead of STANDBY?

0 Alessandro Rossi21 over 5 years ago in reply to TER

Prodigy 200 points

I don’t define any SPI or UART in my code, you mean in the Board.c file?

0 TER over 5 years ago in reply to Alessandro Rossi21

TI__Guru**** 317180 points

Sorry, I thought that more than the GPIO driver was activated in the empty project. Which hardware are you measuring on?

0 AB over 5 years ago in reply to TER

TI__Mastermind 19125 points

0 Katie Pier over 5 years ago in reply to AB

TI__Guru 68116 points

Hi Alessandro,

I'm glad that it looks like this resolved your issue. The thread is now being locked due to inactivity. Feel free to create a new thread if you run into another issue!

Regards,
Katie

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RTOS/CC1352R: Too high current consumption in Standby mode CC1352R