Other Parts Discussed in Thread: LMP91000, , REF3320, REF6025
I am using a Waveshare ADS1256 board to read gas sensor connected through LMP91000. I am using VRef 2.048 on the LMP91000. I have tried connecting the Vref from LMP91000 to the Vref on the ADS1256 board with the AINCOM tied to ground. I have also tried using the ADS1256 builtin 2.5V Vref. In both case the Vref 2.048 from LMP91000 is also connected to A0 on ADS1256. However the Voltage sensed on A0 is 2.069. Can you please let me know what I should do to get the correct ref voltage of 2.048V. The PGA is set to 1, ACAL to 1. I am a newbie so please try to explain elaborately.
Regards
Vijay