Power Management with NRF52833

RE: Power Management with NRF52833

Thishon — Wed, 22 Jan 2025 13:02:40 GMT

The radar sensor which I was using has an enable and power enable pin for low power consumption modes. On disabling the enable pin and power enable pin during sleep mode and then enabling them when fetching data from the sensor I was able to reduce the power consumption.

Addition to that BLE was consuming some power when Advertising. Disabled BLE when entering sleep mode.

Which improved my power ratings and consumed <1.5uA when on sleep mode and 19mA for the data fetching and advertising cycle.

RE: Power Management with NRF52833

Thishon — Fri, 10 Jan 2025 09:45:08 GMT

Yes. Working on that. Thanks for your insights

RE: Power Management with NRF52833

Vidar Berg — Fri, 10 Jan 2025 07:52:54 GMT

It sounds like you may want to experiment with different sampling rates or other sensor configurations since the current consumption is primarily from the sensor and not the MCU.

RE: Power Management with NRF52833

Thishon — Thu, 09 Jan 2025 13:55:56 GMT

The radar sensor module I am using is an ultra-low power consumption package. According to the data sheet the average power consumption 0.2 mW at 0.1 Hz update rate, 3 mW at 10 Hz update rate and 20 mW at 100 Hz update rate with the supply voltage of 1.8V and current can reach upto the maximum of 100mA

I do know how to measure for the current drawn by the sensor as I am using a customized board.

RE: Power Management with NRF52833

Vidar Berg — Thu, 09 Jan 2025 13:46:58 GMT

As I indicated in my previous reply, the nRF52840 should not be able to draw this much current by itself. This is why I asked about the run current for your radar sensor.

RE: Power Management with NRF52833

Thishon — Thu, 09 Jan 2025 13:44:18 GMT

As you can see the ideal current aerage for 10 s interval in sleep mode is 197uA

The average current consumption for one data read cycle is 43mA

RE: Power Management with NRF52833

Vidar Berg — Thu, 09 Jan 2025 13:01:58 GMT

Hello,

What is the run current of the sensor itself, and what is the system idle current between samples? I wouldn't expect the system run current for the nRF52833 to be much higher than 4–5 mA, even if both the CPU and SPIM remain active throughout the sampling period.

Best regards,

Vidar