1) How to read out the AD5629R input register value for every channel? Can you provide the detailed I2C waveform on channel A & G?
2) In the page 24 of AD5629R datasheet Rev.E, there is one line "DB1 selects the internal reference value", but there is no detailed definition for this bit on the datasheet, can you describe it? We want to use AD5629R-1 with 1.25V internal reference, but output voltage to 0~2.5V.
1. The read function only reads the contents currently in the input shift register. You cannot read selected input register contents.
2. Table 10 and Table 11 on page 25 give more information on how to turn on/off the internal reference. To turn on please use command 0x800001. To turn off 0x800000.
If using an AD5629R-1, this has an internal 1.25V, 5ppm/°C reference which is internally gained by 2 to give an output from 0V to 2.5V.