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Bosch Semiconductors

CA271

Transducer IC for ultrasonic parking aid sensors

Application & Technical Summary

CA27x

CA271 is an evaluation IC for ultrasonic transducers. It is used in parking aid systems to measure distances up to four meters.

CA271 stimulates an external transceiver and provides the reflected signal via a 1-wire I/O interface to the parking control unit.

Product benefits

  • 1-wire interface
  • Two operation modes: Send & receive, receive only
  • Configurable transducer current source
  • Transducer driver current monitor
  • Offset cancellation
  • Noise level estimation and compensation
  • Status information queries
  • One-wire interface for wire harness weight reduction

up to 4m

measurement range

Technical Features

Type
Transceiver IC for ultrasonic parking aid sensors
Package
QFN 5x5 (MLF28)
Features

  • Suitable for distances up to 2.5m
  • 1-wire I/O interface
  • Modes: Send and receive, receive only
  • Configurable transducer current source
  • Configurable reference ultrasonic curve
  • Continuous monitoring of transducer driver current
  • Offset cancellation after power on
  • Noise level estimation and compensation
  • Storage capability by PROM and RAM
  • Status information queries

Input
Reflected signal from ultrasonic transducer
Output
Pre-driver for ultrasonic transducer
Control interface
Single wire, bi-directional interface for ECU communication and end-of-line adjustment
VDD typ. [V]
7 - 18
VPAmax [V]
25
FSEND [kHz]
48
IPAmax [A]
200 to 500 mA (with external PNP)
TA min [°C]
-40°C
Tj max [°C]
100°C

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