This solution is built on the ELMOS E524.08 and E524.09 ultrasonic transducer driver and signal processing ICs. The chipset integrates a highly reliable and easy-to-use distance measurement system. Beyond ultrasonic parking assist systems in the automotive electronics industry, it also suits industrial applications such as industrial robots, liquid level detection and distance measurement. The device complies with the AEC-Q100 standard and PPAP.
Key Points
- QFN20L4 package delivers high integration in a compact footprint
- Integrated chip-and-transducer structure creates a fully digital sensor head with stronger noise immunity
- Application-specific standard product (ASSP) for better sensor-to-sensor consistency
- Key parameters such as transmit power, echo gain and receive sensitivity are software configurable
Solution Overview
The system is split into two modules, the ECU and the sensor head. The E524.08/09 and the ECU communicate over a 2-wire or 3-wire interface to carry out parameter configuration, status readback, distance measurement and other commands. The ECU sends a measurement command to tell the E524.08/09 to start measuring. On receiving the command, the E524.08/09 drives the combined transmit/receive ultrasonic transducer to emit the ultrasonic burst and pick up the echo from the obstacle. The IC then amplifies the received echo and performs signal processing such as analog-to-digital conversion and digital filtering, and returns the digitized waveform to the ECU over the communication interface. The ECU analyzes the received waveform for distance calculation and obstacle detection, thereby implementing all UPAS functions.
Core Components
- MCU: NXP, ZLG Microelectronics, GD and others, full part number available on request
- UPAS driver IC: E524.08, E524.09 (ELMOS)
- Level shifter IC: TJA1021 (NXP)
- CAN transceiver: TJA1044 (NXP)
- LDO: Maxlinear, HTC, ON and others, full part number available on request
Key Advantages
- Strong noise immunity
- Digital bidirectional interface available in both 2-wire and 3-wire forms
- Broad compatibility
- Drives ultrasonic transducers over a frequency range from 30kHz to 83kHz
- Highly flexible in use
- Programmable transmit power, echo gain and receive sensitivity
- Suits a wide range of use cases
- Integrated short-range and long-range modes
- Excellent performance
- Advanced functions including STC, ATG, NFTG, EPD and RT
Applications
Primary applications: ultrasonic parking assist system (UPAS), automatic parking assist system (APAS)
Extended applications: industrial fields such as industrial robots, liquid level measurement and distance measurement
Reference Design K5240X-0001: Ultrasonic Parking Assist Demo Kit Mainboard / K52409-0001: E524.09 Ultrasonic Sensor Board
- Graphical visualization of echo waveforms and comparison thresholds
- Supports echo detection and distance measurement
- Easy configuration and tuning of all IC parameters
- Supports programming of the non-volatile memory area
- Supports multi-sensor mode (one sensor transmits the ultrasonic burst while all sensors receive the echo)
Functional Block Diagram
