while spi slave mode, no problem with ss pin connecting to groundhttps://devzone.nordicsemi.com/f/nordic-q-a/10167/while-spi-slave-mode-no-problem-with-ss-pin-connecting-to-groundI&#39;m going to configure nRF51822 chip as a spi slave. And there are no more pins for the connector. So I am trying to connect SS pin to the ground pin, instead to connect to SS pin of SPI master chip. I will try with my EVB but I want to receiveen-USTelligent Community 13Tue, 10 Nov 2015 12:23:39 GMTRE: while spi slave mode, no problem with ss pin connecting to groundhttps://devzone.nordicsemi.com/thread/37704?ContentTypeID=1Tue, 10 Nov 2015 12:23:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0a8eb85b-768c-4255-8b25-9786611900cdEinar Thorsrud<p>The SPI peripheral requires the HFCLK, and requests it when SS (CSN) is asserted. Thus you would see a significant power consumption if SS is tied to ground. Also, many designs use the chip select pin as a wake-up source.</p> <p>You could probably find a work around, depending on your requirements. Moreover, if you do not care about power consumption I do not see a big problem (though I have not tested it).</p><div style="clear:both;"></div>