https://devzone.nordicsemi.com/f/nordic-q-a/43323/io_supply-vio-sclk-and-sdata-pinsHi, The above pins are connected to test points in the ref schematic but stated as Nordic reserved in the pin description. Should I connect them to test points or can I leave them open? /Peteren-USTelligent Community 13Tue, 05 Feb 2019 10:14:45 GMThttps://devzone.nordicsemi.com/thread/169465?ContentTypeID=1Tue, 05 Feb 2019 10:14:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a30ad5df-e08f-4eec-9ac5-66f70bcd4c4aSimonr<p>Hi Peter</p> <p>VIO, SCLK and SDATA are used for RFFE control inside the SiP, and should alongside IO_SUPPLY still be considered as reserved pins. Leave them open.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>