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ADM1278-2A Unused SPI Pin

Question asked by henry-tang on May 9, 2017
Latest reply on May 10, 2017 by Migs

Hi Sir,


According ADM1278 datasheet, If the ADM1278-2 model is used but the SPI pins are not required, tie the SPI input pins (SPI_SS, MCLK) to VCAP and the SPI output pin (MDAT) can be left floating or tied to GND.


SPI_SS > pin 9

MCLK > pin 10

MDAT > pin 11


But Is it necessary to tie pin9 & pin10 to VCAP? Can I leave both of them floating?


Thanks very much!!