Digital Ultrasonic Parking Assist System HT45F39 Characteristics Digital Ultrasonic Sensor Module 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 HT45F39 Application Areas Block Diagram HT45F39 VDD HT8 MCU Core IAP/ICP LVR INT LIRC/WDT Timebase ROM 2K x 16 RAM 128 x 8 HIRC OSC. 5V Shunt Regulator VSS PA4/AN4 PB1 GPIO PB2 PA0/TP0/AN0/SDAT CTM0 HSBCU S1 PB0 PA5/SCFO/AN5 GPIO PA3/TCK0/AN3 PA1/AN1 AEP VREF 1.25 CTM1 OP1O HS ADC PA6/TCK1/AN6 - - + + VCM … S2 PA7/AN7 Application Circuit 40KHz/58KHz Band Pass SCF 5V - HSBCU + PA2/TP1/AN2//SCLK OP1N