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CC2650 Sensor Controller power consumption

Sampo Hytonen
Prodigy 40 points

Other Parts Discussed in Thread: CC2650

Hi,

I have gone through SCS examples with Sensortag2 and I measured power consumption from the circuit.

First the power consumption was 3.15 mA when CM3 was in standby mode and 5.35 mA when it woke up, regardless which example I was trying. Then I closed down MPU9250 sensor and the current consumption dropped down to 270 uA when CM3 is in standby and 1.98 mA in active mode.

I tried Sensor Controller code that keeps it in sleep mode 1 second and then active 1 second. The main processor was in standby mode. The current consumption then was 257 uA in sleep and 1.02 mA in active (SC active, M3 standby), while it should be (at least I think so)
 ~500 uA + ~8 uA / Mhz = 500 uA + 192 uA = 692 uA.

Could you tell me if there is still some sensor or circuit on the board that consumes energy for nothing.

Any help appreciated.

Regards, Sampo

  • 0
    TI__Guru 56590 points

    Hello Sampo,

    The Sensortag is not an ideal platform to measure current consumption as many sensors are powered and also draw some current while they are powered down. You will have to use you soldering iron and remove the sensor to confirm the chip current only. The HW platforms mentioned below are much easier to measure current on:

    • SmartRF06EB+EM
    • CC2650 LaunchPad