Digital Ultrasonic Parking Assist System HT45F39 Characteristics Digital Ultrasonic Sensor Module ‒ USM Direct 12V power supply connected to VDD Detect range : 0.3m ~ 2.5m Resolution : 0.01m Accuracy : 0.1m Supports 40kHz or 58kHz Ultrasonic Sensor Sensor Residual Signal Reduction Programmable Gain Control Ultrasonic Sensor Sensitivity Compensation Slave Ultrasonic Module ID free Bus interface with ISP and IAP function Supports up to 15 slave modules on each bus US Module Digital Sensor Module HT45F39 LED Display Application Areas Block Diagram HT45F39 12V PA7 40kHz or 58kHz Burst Clock US Sensor Amplifier/ Driver BCU VSS PA2 Distance Distance Display Display BUS1 Sensor Module 1 Sensor Module 2 Host Voice Voice Alarm Alarm BUS2 Sensor Module 4 12V Sensor Module 5 VSS Sensor Module 6 Sensor Module 8 Application Circuit Digital Ultrasonic Sensor Module ‒ USM