CA3228E HARRIS [Harris Corporation], CA3228E Datasheet

CA3228E

Manufacturer Part Number

CA3228E

Description

Speed Control System with Memory

Manufacturer

HARRIS [Harris Corporation]

Datasheet

1.CA3228E.pdf (9 pages)

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Company:

Meier Automation Equipment Co., Limited

Part Number:

CA3228E

Manufacturer:

HARRIS

Quantity:

20 000

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Download datasheet (117Kb)

June 1999

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

Features

• Low Power Dissipation

• I

• 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

Applications

• Automotive Speed Control

• Residential and Industrial Heating and Cooling

• Industrial AC and DC Motor Speed Control

• Applications Requiring Acceleration and Deceleration

Pinout

CURRENT SENSE SPEED

Controls

Control

L Control Logic

DRIVER COMMAND

Harris Corporation 1999

COMMAND DELAY

SENSOR INPUT

BRAKE INPUT

OSCILLATOR

V MEMORY

F/V FILTER

F/V OUT

GND

CA3228 (PDIP)

TOP VIEW

GND

OUTPUT GATE

VACUUM CONTROL

VENT CONTROL

CONTROL AMP+

CONTROL AMP OUTPUT

CONTROL AMP-

ALIGN

V ERROR

ACCELERATE CAPACITOR

ACCELERATE RESISTOR

10-31

Description

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.

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.

Speed Control System with Memory

Ordering Information

CA3228E

NUMBER

PART

TEMPERATURE

-40

CA3228

C to +85

File Number

24 Lead Plastic DIP

PACKAGE

1436.3

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CA3228E Summary of contents

Page 1

... Actuators are needed to convert the output signals into the mechanical action necessary to control vehicle speed. The CA3228 is supplied lead dual-in-line plastic package (E sufﬁx). Refer to AN7326 for application information. Ordering Information PART NUMBER CA3228E 24 GND OUTPUT GATE 23 VACUUM CONTROL 22 VENT CONTROL 21 ...

Page 2

Absolute Maximum Ratings Supply Voltage +9.0V CC ...

Page 3

Electrical Speciﬁcations T = +25 A PARAMETERS Memory Set Error Deadband Range (VAC and VENT Outputs Off) Control Amplifier Gain D/A Voltage Range Functional Block Diagram COMMAND DRIVER COMMAND 3 DECODER AND COMMAND DELAY 4 ...

Page 4

NO BRAKE? NO COAST? YES NO > 25MPH? YES INPUT > 40ms? RELAX > 2 MPH? SERVO YES STILL COAST? NO ENABLE SERVO STORE PRESENT SPEED CRUISE YES COAST >40ms YES ACCEL > 40ms YES YES ...

Page 5

... OFF N S SPEED INPUT FREQUENCY 2.22 Hz/MPH ALL RESISTANCE VALUES ARE IN OHMS FIGURE 2. TYPICAL AUTOMOTIVE SPEED CONTROL APPLICATION 0.22 F +8.2V 1.2K 1.2K V VAC CC VENT CA3228E (SEE FIGURE 2) 620 4.7K 0.5W GATE ACCEL CRUISE VAC (Pin 22 VENT (Pin 21 GATE (pin 23 FIGURE 3. SOLENOID DRIVERS AND SERVO VACUUM CONTROL MECHANISM TYPICAL APPLICATION ...

Page 6

Device Description and Operation The functional block diagram and Figures 1, 2 show the speed- control ﬂow chart, and a typical automotive speed- control application, respectively. Command Decoder and Delay Logics (Pins 3,4) Driver commands are input to pin 3 ...

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CA3228E HARRIS [Harris Corporation], CA3228E Datasheet

CA3228E

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CA3228E Summary of contents

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