Ultrasonic Distance Measurement HT45F391 Characteristics ► Operation voltage : 4.5V ► Measurement range : 50mm ~ 3000mm ► Precision : 0.3cm ► External NTC to distance temperature – adjust sound velocity ► Auto-Envelope Processor – AEP -- for input signal processing Application Areas 2015 Holtek New Product Presentation D06 Block Diagram 4.5V Ultrasonic Transmitter Circuit MCU HT16K33 I2C T MCU HT45F391 R T mm 4 Digit LED Application Circuit Temperature Detection Circuit Power Circuit Ultrasonic Transmetter & Receiver Circuit HT16K33 Digital LED Driver Circuit HT45F391 Master MCU Reference Voltage Circuit 2015 Holtek New Product Presentation D06