They implement a software "dummy read" before the temperature word. Instead of: Start -> Send Address -> Read High Byte -> Read Low Byte -> Stop
That's an excellent topic, as the (non-contact infrared thermometer) is a popular sensor, but Proteus doesn't include it natively.
If Proteus cannot find the Mlx90614 library, double-check that the library files are in the correct directory and that you've updated the Proteus library list.
Some versions require a .HEX or .DLL file inside a MODELS folder:
C:\Program Files (x86)\Labcenter Electronics\Proteus 8 Professional\Data\LIBRARY Note: If you don't see it there, check
Many hobbyists have released open-source models.
Here is an Arduino sketch that reads the MLX90614 over I2C. You can compile this in Arduino IDE, get the HEX file, and load it into Proteus’s Arduino model.