PWM COMMUNICATION SYSTEM

PROBLEM TO BE SOLVED: To provide a pulse-width modulation (PWM) communication system capable of highly accurate multiplexed communication at a low cost.SOLUTION: A sensor unit 21 generates and transmits 100%-duty and 0%-duty transmission signals SG as a reference pulse before transmitting a transmission signal SG based on a digital signal data-compressed by a signal processing circuit 26. An input capture circuit 12 of an ECU 11 measures duty time and a PWM cycle of a transmission signal SG according to a timer clock generated by a timer circuit 13. A signal processing circuit 14 of the ECU 11 generates a duty correction factor k based on the duty time and PWM cycle of the reference pulse measured by the circuit 12, generates a received data based on the duty time and PWM cycle of the transmission signal SG measured by the circuit 12 and the duty correction factor k, and separates the received data to a sensor value of a pressure sensor 24 and a sensor value of a temperature sensor 25.