ADE7763 Voltage channel attenuation network and Vrms register reading problem

[Deepak Rathore]

Good morning frnds ,


i am using ADE7763 in my project of Energy meter.i have succesfully made SPI communication between ADE7763 and MCU. and i also successfully got Completed the IRMs part.
but I have some problem in the Vrms register reading and attenuation part.

I am giving Ac Voltage in the range of 0-250VAC. and according to that i m getting mV on the V2P pin of ADE7763 which is as foollows.

VAC               Analog Input (V2P to Agnd)       Vrms Reading
3                        0.006                                 596773
20                      0.019                                  603404                           
50                      0.047                                  605090                          
80                      0.075                                  678500                          
100                    0.093                                   766505                          
150                    0.139                                   1013334                         
200                    0.186                                   1272118                     
250                    0.231                                   1526387

as per my readings and data i m getting too much high readings in the range of 0-50VAC.
and second problem is that on the same lower voltage of 3VAC, i m getting different different readings in the Vrms register that creates very big problem in my project.

so please help to troubleshoot the Vrms Part.