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AS8412 Dataheets PDF



Part Number AS8412
Manufacturers austriamicrosystems AG
Logo austriamicrosystems AG
Description HIGH PERFORMANCE AUTOMOTIVE SONAR INTRUSION
Datasheet AS8412 DatasheetAS8412 Datasheet (PDF)

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 transducer.

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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 Automotive Sonar Intrusion – Data Sheet AS8412 Pin Description AS8412 Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name TX1 OSCIN OSCOUT VCAP AVDD AGND RXGND RX SEL40K ALEN SENS0 SENS1 SAS TP VDD GND LED WARN ALARM TX2 Description 40-kHz burst generator - output 1. Clock input or crystal / ceramic resonator connection. Crystal / ceramic resonator connection. Not connected when external clock is applied. Pin for programming capacitor at the envelope detector. Analog supply voltage (+5V). Analog ground. Analog ground. Ultrasonic echo input. Time reference select input (SEL40K=’1’ to select 40 kHz or SEL 40K=’0’ to select 400 kHz at OSCIN). Alarm enable input (when ALEN =’0’, the outputs ALARM, WARN and LED are disabled). Sensitivity selection (least significant bit). Sensitivity selection (most significant bit). SAS enable input (SAS=’1’ activates Self-Adjusting Sensitivity, SAS=’0’ keeps sensitivity fixed) Test / reset pin. A rising edge resets the IC. This pin should be left unconnected or tied to VDD for normal operation. Digital supply voltage (+5V). Digital ground Active-low signalling LED output (open drain). Active-low auxiliary alarm output (open drain). Active-low main alarm output (open drain). 40-kHz burst generator - output 2. Pinout & Packaging Available Package(s): • • 20 pin DIP 20 pin SOIC TX1 OSCIN OSCOUT VCAP AVDD AGND RXGND RX SEL40K ALEN 1 2 3 4 5 6 7 8 9 10 20 TX2 19 ALARM 18 WARN 17 LED 16 GND 15 VDD 14 TP 13 SAS 12 SENS1 11 SENS0 March 2001 Page 3 of 14 High Performance Automotive Sonar Intrusion – Data Sheet AS8412 Absolute Maximum Ratings Conditions: 1. AII voltages referenced to GND 2. AVDD connected to VDD 3. AGND connected to GND < 7V -0,3 V to VDD + 0.3 V -0,3 V to VDD + 0.3 V 500 mW -40 °C to +85 °C -65 °C to +150 °C -10mA … + 10mA Supply Voltage Input Pin Voltage Output Pin Voltage Power dissipation Operating temperature under bias Storage Temperature Latch-up immunity Note: Stresses above these values may cause permanent damage to the device. Functional operational at these values is not implied ESD immunity / HBM: 1500 Ohm; 100 pF Recommended Operating Conditions Parameter Supply Voltage (VDD, AVDD) Operating Temperature Range Clock Frequency (SEL40K=1) AC Peak Voltage at RX Input Symbol VDD TO FCK VIN Min 4.5 -40 39 0.1 Typ 5.0 40 Max 5.5 85 41 10 Units V °C kHz mV D.C. Electrical Characteristics (VDD = 5 V, VSS = Ground, TA = -40 °C to +85 °C) Parameter Low Level Input Voltage High Level Input Voltage Low-to-High Threshold High-to-Low Threshold Hysteresis Low Level Input Current High Level Input Current Input Resistance Symbol Vil Vih Vt+ VtVh Iil Iih Rin Min 3.5 1.4 0.6 -1 Typ 3.0 1.8 200 Max 1.5 3.5 1 Units V V V V V µA µA kΩ Conditions Pins 2, 9, 11, 12, 13 Pins 2, 9, 11, 12, 13 Pin 10 (Schmitt Trigger Input) Pin 10 (Schmitt Trigger Input) Pin 10 Pins 9, 10, 11, 12, 13, (VDD=5 V) Pins 9, 10, 11, 12, 13, (VDD=5 V) Pin 8 March 2001 Page 4 of 14 High Performance Automotive Sonar Intrusion.


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