Idle current consumption

[mich_x]

What is the current consumption of nRF52480 when idle.

I used power profiler to measure it. But I want to know if it is accurate.

[Sigurd]

Hi,

If you close the UART(E) with app_uart_close(), and stop the scanning(comment the scan_start();, or call sd_ble_gap_scan_stop()) you should see a couple of µA power consumption.

Note that you on the nRF52840-PDK need to cut both SB40 and SB41 to get accurate current measurements.

Note, you need to power cycle the UARTE peripheral after you call app_uart_close() in order stop HFCLK and DMA bus. See this post

So you need to do it like this when you close the UARTE:

err_code  = app_uart_close();
*(volatile uint32_t *)0x40002FFC = 0;
*(volatile uint32_t *)0x40002FFC;
*(volatile uint32_t *)0x40002FFC = 1;

Also remember to disable the log module in sdk_config.h (set NRF_LOG_BACKEND_RTT_ENABLED and NRF_LOG_ENABLED to 0)

[Sigurd]

This "wave" is probably the on-chip power regulator working in auto-controlled refresh mode in order to maximize power efficiency. It's completely normal, and lowers the average power consumption. See the quote in this post.

When you measured, what was the average current consumption ?