Low-power for nrf52

[Artur]

Hi,

I am trying to develop low power beacon on nrf52.

Which example should I base on?

I am trying example ble_app_blinky on PCA10040, and I am getting close to 1 mA, but I need something closer to 10uA.

In this example in main loop there is sd_app_evt_wait() so shouldnt it work?

Regards,

Artur

[Artur]

I am keep getting results near 700mA. I have been trying beacon and blinky examples.

I disabled log, set dcdc, increased interval etc. I am trying examples on PCA10040 not on my board to exclude hardware mistakes.

Have You got any more hints?

[AndreasF]

Hi.

Can you try this in order to check if there is any hardware faults:

1. Download this file: test.hex

2. Do nrfjprog -e.

3. Program only this .hex file (test.hex)

4. Measure the average.

This is what I got:

About 480 µA average. With only logging disabled.

Best regards,

Andreas

[Artur]

Hi,

2.5mA on average with oscilloscope. Handy multimeter showed results closer to 3mA.

Regards,

Antek

[AndreasF]

Hi again.

Are you sure that your measurement setup is correct?

Have you read the documentation on how to measure with a oscilloscope and a multimeter?

Best regards,

Andreas

[Artur]

Hi,

I may not measure exactly like in documentation but I have two PCBs to check.

I am testing softwares also on my beacon, and when I run my low power nrf51 code on nrf51 beacon I get 5uA between advertising, on beacon with nrf52 and nrf52 code I get 500uA.  

Should I change #define NRF_LOG_BACKEND_UART_ENABLED 1?

Should I do something with FPU unit?

Regards