Hi, I am working on developing a new motor driver using ST motor control.
I am trying to understand current sensing circuitry (three shunt resistors) but I don't understand the offset circuitry as shown in this picture:
As I currently understand it this R1/R2/R3 circuitry is there to add a voltage offset so that when there is reverse current the shunt resistor generating negative voltage. But what I don't understand is that this offset voltage(in the reference designs I have looked at) that offset voltage is very high (2 volts) because it is still being amplified by the Opamp resulting in a way to high ADC voltage??
What am I missing here?
