How to power down the UART on nrf52832

RE: How to power down the UART on nrf52832

riceman0 — Thu, 26 Mar 2020 02:40:45 GMT

Thanks... I'll compare and contrast to what I'm seeing when I can get back to my equipment. :)

RE: How to power down the UART on nrf52832

Jørgen Holmefjord — Tue, 24 Mar 2020 06:58:29 GMT

The current consumption of the examples will depend on many factors, especially how often packets are transmitted over BLE. I checked the ble_app_uart example with and without the errata 89 workaround, and I do not see any difference in average current consumption (~480 uA):

This is also in line with the expected current consumption reported by the nRF Online Power Profiler (I may have entered too large packet payload, which could explain the higher current reported by the calculator):

If you want a lower current consumption, you should try to increase the advertising interval in the application.

RE: How to power down the UART on nrf52832

riceman0 — Mon, 23 Mar 2020 15:08:52 GMT

Actually I am seeing the ble_app_uart example, after app_uart_close, we don't see the power drop nearly as much as the blinky example while advertising.

Are those the wrong registers for this peripheral? (I actually don't understand the difference between UARTE0 and UART...)

https://devzone.nordicsemi.com/f/nordic-q-a/59373/how-to-power-down-the-uart-on-nrf52832

RE: How to power down the UART on nrf52832

Jørgen Holmefjord — Mon, 23 Mar 2020 15:03:11 GMT

Hi,

Are you seeing abnormal current consumption after disabling UART with the uart_close() function? The workaround in the thread you are linking is related to this errata. If you are not seeing excessive current consumption, there is no need to implement the workaround. The base address for UARTE0 is the same on nRF52832 as nRF52840, the workaround is identical for the two devices.

Best regards,
Jørgen