High Performance Automotive Sonar Intrusion – Data Sheet

AS8412

March 2001

Page 3 of 14

Pin Description

AS8412

Pin #

Name

Description

1

TX1

40-kHz burst generator - output 1.

2

OSCIN

Clock input or crystal / ceramic resonator connection.

3

OSCOUT

Crystal / ceramic resonator connection. Not connected when external clock is applied.

4

VCAP

Pin for programming capacitor at the envelope detector.

5

AVDD

Analog supply voltage (+5V).

6

AGND

Analog ground.

7

RXGND

Analog ground.

8

RX

Ultrasonic echo input.

9

SEL40K

Time reference select input (SEL40K=’1’ to select 40 kHz or SEL 40K=’0’ to select 400 kHz

at OSCIN).

10

ALEN

Alarm enable input (when ALEN =’0’, the outputs ALARM, WARN and LED are disabled).

11

SENS0

Sensitivity selection (least significant bit).

12

SENS1

Sensitivity selection (most significant bit).

13

SAS

SAS enable input (SAS=’1’ activates Self-Adjusting Sensitivity, SAS=’0’ keeps sensitivity

fixed)

14

TP

Test / reset pin. A rising edge resets the IC. This pin should be left unconnected or tied to

VDD for normal operation.

15

VDD

Digital supply voltage (+5V).

16

GND

Digital ground

17

LED

Active-low signalling LED output (open drain).

18

WARN

Active-low auxiliary alarm output (open drain).

19

ALARM

Active-low main alarm output (open drain).

20

TX2

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

TX2

ALARM

WARN

LED

GND

VDD

TP

SAS

SENS1

SENS0

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11