CC1310: Current consumption when sleeping

Matteo Foppiano

Part Number: CC1310
Other Parts Discussed in Thread: ENERGYTRACE,

I have a NoRTOS firmware running on CC1310 Launchpad. I measure the power consumption with EnergyTrace and a CC1312 Launchpad: I connect only the 3.3V and GND of CC1310 to CC1312 and start the measure (no other pins are connected to CC1310 or CC1312).

When firmware goes into sleep I see a "Mean current" of 8.8uA with "Max current" of 12mA. The firmware is using RF, ADC, external flash (of the launchpad), UART, Battery monitor, a timer and some digital IOs. I stop RX on RF, close ADC, stop timer, disable battery monitor, before going to sleep.

1) are the consumption I see normal? I expect lower consumption according to datasheet

2) is there a way in the firmware to know if something wakes up the chip during sleep. Just to know if I left something enabled that cause 12mA spikes during sleep

This is the current trace I have during sleep

Thank you

over 1 year ago

0 Arthur R☑️ over 1 year ago

TI__Mastermind 24960 points

Hi Matteo,

I see that you are using the ADC, how are you configuring the ADC pins when your device goes to sleep, are they left floating? You should try pulling it up or down, per: https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/1287039/cc1312r-power-consumption-regarding-thread-on-cc1312/4924523#4924523

As of the pulses you are observing, I think thoses are VDDR recharge pulses. You can get more information in the following document: https://www.ti.com/lit/an/swra478d/swra478d.pdf

Regards,

Arthur

0 Matteo Foppiano over 1 year ago in reply to Arthur R☑️

Prodigy 160 points

Hi Arthur,

thanks for your reply.

I've checked the ADC pin, after ADCBuf_close(), the configuration seems fine (INPUT with PULLDOWN), but the current consumption is still around 8.8uA.

About RF: I'm simply stopping any TX/RX there; do I have to do something else to lower down the power consumption?

About recharge pulses, I'm going to read the doc to understand them, thanks.

+1 Arthur R☑️ over 1 year ago in reply to Matteo Foppiano

TI__Mastermind 24960 points

Hi Matteo,

Do you also run an EnergyTrace calibration before measurements?

Another reason for that increased current could be that the external flash is still somehow active, did you check this?

As of the radio, running RF_yield(rfHandle) at the end of your radio work should put the radio to sleep.

Regards,

Arthur

0 Matteo Foppiano over 1 year ago in reply to Arthur R☑️

Prodigy 160 points

Thank you, seems that closing the NVS will decrease the mean current to 1.6uA, which is great.

I also tried in the past with NVS close, but the mean current was (curiously) increased. Probably at that time I was using our board and not the development board for power measurement: probably our board has some issues that shall be improved.

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CC1310: Current consumption when sleeping