I'm trying to read out an AD7682 with a LPC1113/301, but I only read back zero's. I'm want to use the internal reference of 2V5 (supply is 3.0V), but when measuring this on the REFIN pin it's almost 0V. When trying to read back the CFG register, the AD7682 gives back the data I've sent (and it seems correct).
I'm using the following design:
The following communication occured when trying to read out the ADC values (channel 1 (yellow) is DIN, 2 (purple) is SDO, 3 (cyan) is SCK and 4 (green) is CNV).
Does anyone has an idea what I'm missing or doing wrong?
Thanks in advance,