SigData using VREF as input. | Cypress Semiconductor
SigData using VREF as input.
I am new to PSOC and am trying to become familiar with the CY8CKIT-059 PSoC 5LP Prototyping Kit. I would like to use it as a low cost, fairy accurate multi channel data acquisition system. I would like to use the internal 1.024 VREF as one of the input signals and use the resulting value to judge the accuracy of the remaining channels. Unfortunately, I don't get the expected results. I would like to use the 20 bit Sigma Delta A2D with a single input range of 0.0 to 6 *Vref. When I connect the Vref through an analog mux I get values of approximately 1.78 volts. When I buffer the input through an op amp follower I get results of 2.33 volts. I am obviously missing something basic.
Can someone give me a hint??