NCV75215
Description
The NCV75215 ASSP is intended to operate with a piezoelectric ultrasonic transducer to provide time-of-flight measurement of an obstacle distance during vehicle parking. The high-sensitivity, low-noise operation allows detection from 0.25 m up to 4.5 m for a standard 75 mm pole. Actual minimum distance is determined by the length of reverberations. Under ideal conditions, with perfectly tuned and matched external circuitry, a minimum distance of 0.2 m is achievable. Actual detection range depends on a piezoelectric ultrasonic transducer and external analog parts.
The device drives the ultrasonic transducer with a programmable frequency via a transformer. The received echo is amplified and converted to a digital signal, filtered, detected and the magnitude is pared to a time-dependent threshold which is stored in an internal RAM. Distance to the obstacle is determined by the time measured from a transmission burst to echo recognition.
A bidirectional I/O Line is used to...
