I’m making a BLDC motor controller application. The motor control IC (Allegro A4931) uses low side current sensing (R7,R8,R9) for controlling the motor. Unfortunately the motor IC does not output a amplified version of the SENSE voltage. I would like my MCU to measure the current with the use of the same resistor. Is there anyone that can help me pick out the right components to do so? I would like the MCU ADC to measure 0V at 0A and Vcc (3.3V) at 5A through the resistors. There is no need for a super accuracy (+-0.25A is ok).
Thanks!