HIGH PERFORMANCE AUTOMOTIVE SONAR INTRUSION - austriamicrosystems AG
Description
AS8412 HIGH PERFORMANCE AUTOMOTIVE SONAR INTRUSION
Data Sheet March 2001
High Performance Automotive Sonar Intrusion – Data Sheet AS8412
Key Features
• • • • • • • • • • • • • • • • • • True sonar/pulse-echo operation Wide dynamic range Programmable sensitivity levels Self-adaptive to vehicle interiors Self-adaptive to temperature and environmental changes High sensitivity to intrusion Immunity to false alarms Detection of sabotage attempts Compatible with standard 40 kHz ultrasonic transducers No adjustments needed at factory or at field Few external components Time reference: external clock or oscillator based on crystal/ceramic resonator Built-in self-test Internal power-on-reset Advanced CMOS technology Low power consumption: 0.
65 to 1.
0 mA Operation between -40°C and +85 °C Available in 20-pin DIP and 20-pin SOIC package
General Description
The AS8412 is a signal processing IC designed to implement reliable, high-performance sonar intrusion detectors.
It generates short 40 kHz bursts to feed an ultrasonic transducer.
The resulting sonar waves are reflected on the vehicle interior and the echoes are received by another transducer.
Inside the AS8412, the electrical signal is first submitted to an analog conditioning circuit, then it is digitized and processed by a DSP, whose output is analyzed by a discriminator based on fuzzy-logic techniques.
Thus, true intrusion conditions can be discerned from natural phenomena and other allowable disturbances.
No adjustments are necessary at factory or at the field, as the AS8412 is self-adaptive to the physical and environmental conditions.
Compact and EMI-resistant intrusion detectors are made possible, due to the small number of components.
Block Diagram
VCAP RX PREAMP
BAND-PASS FILTER
AGC
ENVELOPE DETECTOR
A/D CONVERTER
TX1 TX2
MODULATOR / DRIVER
CONTROL LOGIC
DSP
DISCRIMINATOR
SAS SENS 1 SENS 0
SEL40K OSCIN OSCOUT
OSCILLATOR
SIGNALLING
ALEN LED WARN ALARM
March 2001
Page 2 of 14
High Performance Aut...
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