The TPIC43T01/02 is a monolithic motor control integrated circuit designed to provide RPM control to a 3-phase brushless dc motor. The device provides two analog sensor input ports which include a speed sensor interface and a Hall effect position interface. The speed feedback interface consists of an FG amplifier to receive an external sinusoidal signal from a variable reluctance pickup and convert it to a digital speed signal for the control circuit. When the motor speed is outside a ±5% window of the reference signal, an out-of-lock condition is declared. The Hall ffect sensor input section receives low-level differential voltages from external naked Hall elements and converts them to digital position reference signals for the control circuit for commutation control.