https://devzone.nordicsemi.com/f/nordic-q-a/104556/microcontroller-does-not-receive-data-via-uart-after-the-level-converterGood Day. I am using a custom board with a nRF52840 (3.3V) microcontroller. GNSS RYS8830 (1.8V) is installed on the board and connected to the microcontroller via UART1 through a transistor level converter (see schematic). The data from the microcontrolleren-USTelligent Community 13Tue, 17 Oct 2023 09:14:44 GMThttps://devzone.nordicsemi.com/thread/450778?ContentTypeID=1Tue, 17 Oct 2023 09:14:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1b750a1f-eb35-4234-b1f2-69303bd5aa0bJared<p>Hi,</p> <p>That is not possible unfortunately, all GPIOs share the same voltage level.</p> <p>regards</p> <p>Jared</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/450701?ContentTypeID=1Tue, 17 Oct 2023 01:56:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6af3224c-f21e-4a49-aa25-23bb4d69fc29backstreet.devisor<p>Thank you Jared.</p> <p>Can you please tell me if I can set only the UART pins to 1.8V?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/449749?ContentTypeID=1Wed, 11 Oct 2023 09:31:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:426afb2e-3ed1-4e75-84ed-51d4cc470951Jared<p>Hi,</p> <p>Can you disconnect the TTL to the PC and probe P0.17 and P0.18 to either a logical analyzer or a oscilloscope, what do you measure? How high are the amplitude of the serial signals now?</p> <p>Btw, you can always decrease the GPIO signals on the nRF52840 by adjusting VDD to 1V8 by setting REGOUT0 to 1V8. The condition is that you&#39;re using the board in high voltage mode,</p> <p>regards</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>