power consumption on nRF52832 with UART

[Evgeny Erlihman]

I am testing the nRF52832 in Rigado BMD-301 module. I am able to get to ~40uA when advertising ,UART enabled but not used and all other peripherals disabled. But as soon as i try reading from UART, the current consumption jumps to ~2.4mA. Does this make sense? Am i using it wrong?

This is my code, the need_more_data is being set on character arrival in UART

for (;;)
    {
        if (NRF_LOG_PROCESS() == false)
        {
  
        	if(need_more_data)
        	{
        		need_more_data = false;
        		(void)nrf_drv_uart_rx(&m_uart, &data, 1);
        	}
            power_manage();
        }
    }

[Hung Bui]

Hi Evgeny,

Uart requires HFCLK and regulators for operation, when you start UART in RX , it will start using HFCLK and regulators. Also if you use EasyDMA it will also draw more current.

I suggest not to use EasyDMA if the data is occasionally received, it actually lower current consumption if using interrupt and CPU when the transmission is seldom.

[Evgeny Erlihman]

Thank you for the speedy reply! This reduced the current consumption considerably!