https://devzone.nordicsemi.com/f/nordic-q-a/33254/nrf52-demo-board-and-5v-powerHi, I would like to use a nRF52 demo board, to test nRF BLE with a HX711 and screen. The nRF module is powered 3.3V but the HX711 and the screen are 5V powered. Is the bus communication I2C working with level translator, and also for signals, data_load_cellen-USTelligent Community 13Thu, 12 Apr 2018 06:50:43 GMThttps://devzone.nordicsemi.com/thread/127952?ContentTypeID=1Thu, 12 Apr 2018 06:50:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:93ec462b-a9dd-4509-b0f8-0aee7a3d8721MartinBL<p>You will need a level converter. You should never connect anything above 3.6 V (the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/recommended_op_conditions.html?cp=2_1_0_5#concept_vng_xls_2q">max recommended operating voltage</a>) to any pin on the nRF52.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/127845?ContentTypeID=1Wed, 11 Apr 2018 13:08:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0e4f0f4a-0e1e-426c-9942-98c67408fa27Mathieu C<p><span>Could the I2C bus work without a level converter?</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/127742?ContentTypeID=1Wed, 11 Apr 2018 07:45:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a76b25e9-40f5-4351-8d08-736561bf3341MartinBL<p>Hi,</p> <p>Using the nRF52 with a 3.3V &lt;-&gt; 5V level converter shouldn&#39;t be a problem.</p> <p>PS: The nRF52 DK has some protection diodes with voltage drops that causes VDD_nRF to be closer to 2.9V. However, a level converter will still work.&nbsp;</p><div style="clear:both;"></div>