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/Title (NCV75215 - Ultrasonic Parking Distance Measurement ASSP)
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2024-02-09T10:12:39-07:00
BroadVision, Inc.
2024-02-09T10:14:08-07:00
2024-02-09T10:14:08-07:00
Acrobat Distiller 23.0 (Windows)
application/pdf
NCV75215 - Ultrasonic Parking Distance Measurement ASSP
Ƶ
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
compared 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 communicate with a master
(ECU). The master issues I/O Line commands to the NCV75215 and
data are reported back via the same line.
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