Abstract: A digital control section generates a digital drive voltage command signal in response to a digital drive current command value and to a drive current digital sensing signal. A digital-to-analog converter generates an analog drive voltage command signal from the digital drive voltage command signal. In response to the analog drive voltage command signal, a driver output section drives a motor and a sensing resistor. If the digital drive current command value is between a positive threshold voltage and a negative threshold voltage, the computation section generates an internal control signal that is in a first state “1”, and exercises control to place the gain of the drive current sensing amplifier in a first state “H”. If not, the computation section exercises control to place the gain of the drive current sensing amplifier in a second state “L”, namely, in a low state.