https://devzone.nordicsemi.com/f/nordic-q-a/49135/nrf52-connect-to-my-own-mpuHi I&#39;m really new in this field, I just had the nrf52 DK. Our team has a mature product but we want a Bluetooth feature on it. I know Nordic chip works as MCU+bluetooth, so now if I want to add Nordic to our MPU what kind of communication protocol shoulden-USTelligent Community 13Tue, 02 Jul 2019 13:26:51 GMThttps://devzone.nordicsemi.com/thread/196018?ContentTypeID=1Tue, 02 Jul 2019 13:26:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fc36912c-edf4-402b-80e7-bf993bf2d1acCindy<p>thanks.</p> <p>Cindy</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/195435?ContentTypeID=1Fri, 28 Jun 2019 21:10:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:01ad037c-473e-4265-b25b-cfda83011639awneil[quote userid="18935" url="~/f/nordic-q-a/49135/nrf52-connect-to-my-own-mpu/195430"]You could use UART, SPI or I2C[/quote] <p>Indeed.</p> <p>And, if you use an nRF52840, you could also use USB ...</p> <p><span class="mceItem mceNonEditable mceQuote" id="mceQuote1">...</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/195430?ContentTypeID=1Fri, 28 Jun 2019 19:37:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:61a3f33e-3e06-4dfc-ae32-8d673d33b9eaTurbo J[quote userid="81003" url="~/f/nordic-q-a/49135/nrf52-connect-to-my-own-mpu"] nrf52 DK, there&#39;s an external MCU on it and it didn&#39;t seem to connect to the nrf52832[/quote] <p>Clean your glasses and re-read the schematic...</p> <p>There are 2 connections between these MCUs: SWD and UART. The additional &micro;C is the JLink used for programming and debugging.</p> <p>You could use UART, SPI or I2C in order to connect the NRF chip to another MCU.</p><div style="clear:both;"></div>