Related to power consumption

[Alan Ajit]

Dear Nordic,

I have an application which contain UART and BLE advertising. For power consumption i use enable disable UART.

Enable and Disable Uart:-

void Disable_Uart(void)
{
	
NRF_UARTE0->TASKS_STOPTX = 1;
NRF_UARTE0->TASKS_STOPRX = 1;
NRF_UARTE0->ENABLE = 0;
	
	
}

void Enable_Uart(void)
{
	
NRF_UARTE0->ENABLE = 8;
NRF_UARTE0->TASKS_STARTTX = 1;
NRF_UARTE0->TASKS_STARTRX = 1;
	
}

Is it right way to enable and disable UART?

If i do this way what is the maximum current taken by Uart?

[Stian Røed Hafskjold]

If you are using the UART driver I think you should use the init/uninit functions in the driver. http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/group__nrfx__uarte.html?cp=4_0_0_6_9_0_31_0_20#gaa31a9d9e52bfa9196f0dd13bb574eb4d

If not, the way you do it should be fine, as long as you handle it the right way. i.e. making sure ongoing transactions are finished etc.

You can also set all GPIOs to input and disable the input buffer so you don't power the UART slave through the GPIOs.

The UART should not consume any current if uninitialized correctly.

[Alan Ajit]

Thanks for your quick replay. you said that if i disable UART  it's not consume Current am i right(ie calling above disable function:- Disable_Uart())?

If i use UART(disable and enable UART) and BLE advertising how much current will consume(approximately)?

[Stian Røed Hafskjold]

UART in RX mode consumes about 400-600 uA depending on if DCDC is enabled or not.

[Tim]

Hi, we had the same issue and it was fixed by the answer given in this thread : devzone.nordicsemi.com/.../102605