CA3228 Ver la hoja de datos (PDF) - Harris Semiconductor

Número de pieza

componentes Descripción

Fabricante

CA3228

Speed Control System with Memory

Harris Semiconductor 

June 1999

CA3228 NO

Call

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Control

System

with

Memory

Features

Description

• Low Power Dissipation

• I2L Control Logic

• Power-On Reset

• On-Chip Oscillator for System Time Reference

• Single Input Line for Operator Commands

• Amplitude Encoded Control Signals

• Transient Compensated Input Commands

• Controlled Acceleration Mode

• Internal Redundant Brake and Low-Speed Disable

• Braking Disable

The CA3228 is a monolithic integrated circuit designed as an

automotive speed-control system.

The system monitors vehicle speed and compares it to a

stored reference speed. Any deviation in vehicle speed

causes a servo mechanism to open or close the engine

throttle as required to eliminate the speed error. The refer-

ence speed, set by the driver, is stored in a 9-bit counter.

The reference speed can be altered by the ACCEL and

COAST driver commands. The ACCEL command causes

the vehicle to accelerate at a controlled rate; the COAST

command disables the servo, thereby forcing the vehicle to

slowdown. Application of the brake disables the servo and

places the system in the standby mode while the RESUME

command returns the vehicle to the last stored speed.

Applications

• Automotive Speed Control

• Residential and Industrial Heating and Cooling

Controls

• Industrial AC and DC Motor Speed Control

• Applications Requiring Acceleration and Deceleration

Control

Vehicle speed and driver commands are inputs to the

integrated circuit via external sensors. Actuators are needed

to convert the output signals into the mechanical action

necessary to control vehicle speed.

The CA3228 is supplied in a 24 lead dual-in-line plastic

package (E suffix). Refer to AN7326 for application

information.

Pinout

CA3228 (PDIP)

TOP VIEW

GND 1

NC 2

DRIVER COMMAND 3

COMMAND DELAY 4

OSCILLATOR 5

V MEMORY 6

CURRENT SENSE SPEED 7

SENSOR INPUT 8

F/V OUT 9

F/V FILTER 10

VS 11

BRAKE INPUT 12

24 GND

23 OUTPUT GATE

22 VACUUM CONTROL

21 VENT CONTROL

20 CONTROL AMP+

19 CONTROL AMP OUTPUT

18 CONTROL AMP-

17 ALIGN

16 V ERROR

15 ACCELERATE CAPACITOR

14 ACCELERATE RESISTOR

13 VCC

Ordering Information

PART

NUMBER

CA3228E

TEMPERATURE

-40oC to +85oC

PACKAGE

24 Lead Plastic DIP

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.

Copyright © Harris Corporation 1999

10-31

File Number 1436.3

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