my names is Sidolphe , am imbedded system dev ,i designed a smart meter with stm32h750vbt,the mcu work well but the measurements part has issues, when i supply the ade7758 with it supply voltage 5v,it is becoming hot and draw more than 1,98A and the voltage drop to 3,2v .what cause that heat. I did every thing doing a star point between analog and digital ground ,also but the divider circuit on SPI pin but still the issue not solved.

 

Hi Inv,
Welcome To AAC.
Do you have a project circuit diagram that you could post?
E

 

Please post a schematic. Do you have VCC and GND reversed?

also but the divider circuit on SPI pin but still the issue not solved.

That sounds like the computer is running at 3.3V.

 

 

Hi, looks like you are shorting Vdd and GND near C1/C2.
Is the ade7758 getting hot or the 5v power supply?

 

And shorting the VN input!

 

Many digital meter circuits demand that the measurement input common side circuit be completely isolated from the power supply circuits. Connecting the two will destroy some digital meter IC devices. What I see is that the measurement common side, tagged as Vn, pin 13, is tied to the power supply ground at the junction of C1 and C2. THAT may be the problem.
Can you post the application sheets for this IC, please?