Low current consumption nrf52 with UART

[Farhanah Ruslan]

Dear all,

I'm using nRF52810, I want to achieve low power consumption(<200uA). I have disabled easyDMA. Right now I want to know how to turn on/off uart anytime we wish.

What function should I use?

Should I focus on the main.c or nrf_drv_uart.c?

I have tried to call function like app_uart_close() in mian.c, but it didn't work. Please give me more guide on this.

[ovrebekk]

Hi

Which SDK version are you using?

What current draw are you seeing after calling app_uart_close()?

Is there any difference before or after the call?

Could there be any other peripherals running in the background that would contribute to the current draw, like a timer?

Best regards
Torbjørn

[Chab]

Hello, I have the exact same problem : The current draw is around 1ma to 1.5ma. There is no difference before and after.

I am using the SDK15.3.0 and do the migration to the SDK16.0 is not an option.

regards,

Guillaume.

[ovrebekk]

Hi Guillaume

I don't recommend resurrecting older cases if you have an issue. It makes the cases harder to read, and you run the risk that whoever is assigned to the case is not available, which means you won't get a reply (when you open a new case it is assigned to whoever is available). 

Which UART driver are you using? 

Have you double checked that it is the UART driver causing the extra current draw, and that the current draw is low if you remove it?

Best regards
Torbjørn