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LPSTK-CC1352R: Large standby current for EasyLink library on LPSTK-CC1352R

Rei Vilo
Guru 23935 points
Other Parts Discussed in Thread: LPSTK-CC1352R, CC1350, OPT3001, HDC2080, ENERGYTRACE

This is a continuation of the thread CCS/LPSTK-CC1352R: Large standby current consumption (1.7 mA) with LPSTK-CC1352R as sensor focusing on EasyLink.

  • The same Low Power Home Network Weather Monitoring application on the CC1350 SensorTagand the CC1352 LPSTK shows very different power consumption levels measured with EnergyTrace when the node without screen is in idle mode.
BoardIdle mode (mA)
LPSTK-CC1352R 1.864
CC1350 SensorTag 0.014

Question

Could we have some help and guidance from a TI expert please? Thank you!

  • 0
    TI__Guru 58425 points

    Hi Rei,

    Could you elaborate on your EasyLink application in this case? As far as I know, there is no issue from Easylink in terms of power dependencies or constraints. 1.8 mA is also to low a number for the device to be in any actual "active mode". Worst case scenario, you could have a few active interfaces such as UART, SPI etc that prevents full standby. 

    As you seem to be migrating a code from CC1350 ST to the LPTSK one, have you made sure that all external sensors is shutdown as expected etc? If you run for example the EasyLink "WSN Node" example, what current are you seeing?

  • 0 in reply to IUsedToBeARealPerson (M-W)
    Guru 23935 points

    Thank you for the check list.

    Before going idle,

    • The I²C sensors (OPT3001 and HDC2080) are put in sleep mode and the I²C bus is closed. 
    • The SPI bus isn't used and the sensor (ADXL345) is in deep sleep by default.
    • But the UART port wasn't explicitely closed.

    I don't remember having to close the UART port explicitely on the previous version with the CC1350. 

    Now, with no UART, no UART and no SWD connections, only VCC and VDD, I'm reaching 0.0081 mA according to EnergyTrace and the USB XDS110 probe.

    This gives an estimated life of 22 months for a CR2032 according to the estimate for one data transmission every 10 minutes.

     

    Separate measures show ~2 mA for the SPI bus, ~1.7 mA for the UART port and non measurable for the I²C port.