AS8412 View Datasheet(PDF) - austriamicrosystems AG
Part Name
Description
Manufacturer
AS8412 Datasheet PDF : 14 Pages
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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 trans-
ducer. 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 out-
put 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 detec-
tors are made possible, due to the small number of components.
Block Diagram
RX
PRE-
AMP
BAND-PASS
FILTER
AGC
ENVELOPE
DETECTOR
A/D
CONVERTER
VCAP
TX1
TX2
SEL40K
OSCIN
OSCOUT
MODULATOR /
DRIVER
OSCILLATOR
CONTROL
LOGIC
DSP
DISCRIMINATOR
SIGNALLING
SAS
SENS 1
SENS 0
ALEN
LED
WARN
ALARM
March 2001
Page 2 of 14
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