LIN Smart Ultrasonic Parking Assist (ROM) | E524.24

The IC drives an ultrasonic transducer via a centre tapped transformer with a programmable frequency. After amplification and A/D-conversion the signal is digitally filtered to achieve a perfect tracking to the sending frequency without external components and trimming. The adjusted values of oscillator/sending frequency, transmitted power receiver sensitivity can be adjusted and stored in an internal EEPROM. The circuit communicates with a central control device via a single-wire bus which is physically LIN 2.1 compatible. For ease of use a LIN-driver and standard application functions like threshold generation and timer capture are available.
Several diagnostic functions are implemented. A short or open at the transducer output can be detected as well as thermal shut down or under voltage.