AS8412

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

Pinout




Specifications

Supply Voltage	< 7V
Input Pin Voltage	-0,3 V to VDD + 0.3 V
Output Pin Voltage	-0,3 V to VDD + 0.3 V
Power dissipation	500 mW
Operating temperature under bias	-40 °C to +85 °C
Storage Temperature	-65 °C to +150 °C
Latch-up immunity	-10mA . + 10mA

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.