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sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE) no effect on power consumption

Allen

Hello,

I am working on a wearable device and need the lowest power consumption possible. The project configuration is:

  • S132 7.2.0
  • SDK 17.0.2

The board is powered with a bench power supply which displayed current to mA resolution. I am not seeing any difference in power consumption when the DC/DC regulator is enabled. In previous projects there was a significant difference when this feature was enabled. It does not matter if it is before or after enabling the soft device/BLE.

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  • 0

    Hi,

    • What voltage level is the board powered by? The DCDC regulator will affect the current consumption less if the supply voltage is closer to the minimum supply voltage of 1.7 V.
    • What is the measured current consumption? The DCDC regulator will be automatically controlled by the chip, depending on the current draw. It will only be enabled when the current draw is high enough for the DCDC regulator to be more efficient than LDO.
    • I assume that the board is populated with the required components for the DCDC regulator?

    Best regards,
    Jørgen

  • 0 in reply to Jørgen Holmefjord

    Hello Jorgen,

    Either I don't have the PPK setup properly or there may be a hardware issue? Below is a screen capture at startup. It appears that the baseline power consumption is [email protected] with only the BLE initialized. When the DCDC regulator is enabled the consumption actually went up! The capture you provided suggests that the baseline power should be around 5mA and with DCDC enabled it goes lower. I captured this several times to make sure my eyes were not deceiving me.

    Thoughts?

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  • 0 in reply to Jørgen Holmefjord

    Hello Jorgen,

    Either I don't have the PPK setup properly or there may be a hardware issue? Below is a screen capture at startup. It appears that the baseline power consumption is [email protected] with only the BLE initialized. When the DCDC regulator is enabled the consumption actually went up! The capture you provided suggests that the baseline power should be around 5mA and with DCDC enabled it goes lower. I captured this several times to make sure my eyes were not deceiving me.

    Thoughts?

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