https://devzone.nordicsemi.com/f/nordic-q-a/30896/three-twi-same-address-slave-devicesHi, I&#39;m trying to receive sensors data from three fdc1004 that have the same address. Can you have three TWI interfaces at the same time? How do you modify the nfr_drv_twi.h to do so? Thanks, Gretaen-USTelligent Community 13Tue, 27 Feb 2018 11:22:29 GMThttps://devzone.nordicsemi.com/thread/122118?ContentTypeID=1Tue, 27 Feb 2018 11:22:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9ed23bcf-62be-4408-b20c-35c27f4c765dH&#229;kon Alseth<p>Hi,</p> <p></p> [quote user=""]I&#39;m trying to receive sensors data from three fdc1004 that have the same address. Can you have three TWI interfaces at the same time? How do you modify the nfr_drv_twi.h to do so?&nbsp;[/quote] <p>No, that will break the purpose of I2C, where the bus fundamentals rely on unique addressing on the bus.</p> [quote user=""]fdc1004 [/quote] <p>That sensor does not seem to be configurable wrt. I2C-address by looking at the datasheet.</p> <p>If you are using the nRF52832, you only have two TWI hardware peripherals. What you can do is to:</p> <p>1. Use a different SCL and SCK for each sensor, and reconfigure the TWI module for every time you poll each sensor.</p> <p>2. Or use an external mux to select which device to communicate with.</p> <p>3. Contact the vendor and ask them what their recommendations are wrt. this addressing issue.</p> <p></p> <p>Cheers,</p> <p>Håkon</p><div style="clear:both;"></div>