https://devzone.nordicsemi.com/f/nordic-q-a/74712/can-the-lpuart-be-used-without-the-2-additional-control-linesHey Folks, The new LPUART (doc here https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.5.0/nrf/drivers/uart_nrf_sw_lpuart.html ) is supposed to address the issue of the UART consuming a few hundred microamps. It requires two additional control linesen-USTelligent Community 13Wed, 08 Sep 2021 03:26:48 GMThttps://devzone.nordicsemi.com/thread/328481?ContentTypeID=1Wed, 08 Sep 2021 03:26:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1811be28-73da-41d3-a512-0b9b423b12e5Anthony Yuan<p>Hi Kiran,</p> <p>I met the same issue on my custom board too.</p> <p>Did you find a solution of the 2-wire UART current consumption?</p> <p>Regards,</p> <p>Anthony</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/308170?ContentTypeID=1Tue, 04 May 2021 12:20:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c8b9eacc-cc9e-4e6e-8f21-0f2a87f4c404Kenneth<p>It is UART RX that consume current consumption, while TX only consume power during transmission. So in your case you should be able to use any UART implementation you can find, simply don&#39;t start RX to achieve low power. If you use LPUART, then there is no need to use the additional control lines no, though since that driver have been made in specific to use the control lines to achieve low power, you may need to handle this pins in some way (e.g. leave them unconnected will cause REQ pin go high, thereby RX is not started).</p> <p>Kenneth</p><div style="clear:both;"></div>