High Performance Automotive Sonar Intrusion – Data Sheet

AS8413

March 2001

Page 5 of 15

Low Level Output Voltage

Vol

-

-

-

0.5

0.5

0.5

V

V

V

Pins 1, 20, 24

Pins 22,23

Pins 21

Iol=3 mA

Iol=4 mA

Iol=12mA

High Level Output Voltage Voh

4.0

-

-

V

Pins 1, 20, 24

Ioh=-3 mA

Low Level Output Voltage

-

-

-

-

0.4

1.5

V

V

Pin 4 (SEL40K= 0)

Pin 4 (SEL40K= 1)

High Level Output Voltage

4.6

3.5

-

-

-

-

V

V

Pin 4 (SEL40K= 0)

Pin 4 (SEL40K= 1)

High-Z Output Current

-

-

10

µA

Pins 21, 22, 23

Total Supply Current

-

-

0.65

1.0

1.0

1.6

mA

mA

SEL40K= 1

SEL40K= 0

crystal or clock

ceramic res onator

C1=C2=100pF

A.C. Electrical Characteristics

Parameter

Symbol

Min

Typ

Max

Units

Conditions

Power-on-reset width

50

500

500

-

-

-

70

530

800

ms

SEL40K= 0, resonator / clock

SEL40K= 1, clock

SEL40K= 1, crystal

1.3

1.7

1.7

-

-

-

1.4

1.9

2.1

s

SEL40K= 0, resonator / clock

SEL40K= 1, clock

SEL40K= 1, crystal

Fault indication pulse width

4.3

-

4.6

s

SYNC pulse width

-

0.6

-

ms

SYNC period

-

44.4

-

ms

ALARM low pulse width

200

-

-

ms

Pins 22, 23

LED low pulse width

-

-

89

977

-

-

ms

ms

narrow = no detection

wide = detection

LED low pulse width

-

888

-

ms

System Description

Ultrasonic intrusion detectors are very popular in vehicle security systems, due to their low cost,

good area coverage and easiness of installation. The AS8413 uses the sonar principle to build a

high-performance intrusion detector that follows the requirements of the OEM automotive indus-

try. Additionally, the IC supports the use of two or more pairs of sensors. As very short ultrasonic

bursts are sent, the power needed to drive the transmitter is reduced. Interference and signal

ancellation effects, present in systems with continuous transmission, are virtually eliminated.