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PDF CA3228 Data sheet ( Hoja de datos )
| Número de pieza | CA3228 | |
| Descripción | Speed Control System | |
| Fabricantes | Harris Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CA3228 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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June 1999
CA3228NO
Call
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
1 page  
CA3228
V3ON
ON
RESUME
SET/ACCEL
COAST
R3, 2.2K
R4,680
R5, 120
OFF
MOMENTARY
CONTACT
DRIVER
COMMAND
SWITCHES
S1
S2
S3
S4
S5
N
S
T.P.A.
VCC
1
RI 0.1µF 2
560 10K
3
0.68µF
R2 4
10K 5
0.001µF 6
8.2K
0.05µF
43K
0.047µF
7
8
9
150K
10
11
T.P.B.
2.2µF
12
10K 51K
24
23
22
21
20
19
18
17
16
15
14
13
SPEED INPUT
FREQUENCY, fS
2.22 Hz/MPH
BRAKE LIGHT
BRAKE SWITCH
S6
GATE
VAC
VENT
1M
SEE FIGURE 3
VCC
10K
10K
CEXT
2.2µF
2.4M
+
REXT
VCC
SWITCH
FUNCTION
S1 - ON
10K
VOLTAGE AT TERM. 3
RATIO TO VCC
MIN MAX
1.12
-
ALL RESISTANCE VALUES ARE IN OHMS
VBRAKE
S2 - RESUME
S3 - ACCEL
0.725
0.482
0.8
0.599
S4 - COAST
0.148
0.272
S5 - OFF
0 0.094
IDLE (Note 1)
0.93
0.96
NOTE: 1. All Switches Open
FIGURE 2. TYPICAL AUTOMOTIVE SPEED CONTROL APPLICATION
0.22µF
+8.2V
1.2K 1.2K
VCC VAC
VOLT.
REG
+14.4V
VENT
SOLENOID
VENT
CA3228E
(SEE FIGURE 2)
GATE
4.7K
VACUUM
SOLENOID
620
0.5W
TO
AIR
N.O.
VENT
VALVE
TO VACUUM
SOURCE
N.C.
VAC
VALVE DIAPHRAGM
POSITON
FEED BACK
(OPTIONAL
TO PIN 20)
TO THROTTLE
SYSTEM MODE
VALVE
ACCEL
CRUISE
COAST
VAC
Open
NC (Note 1)
NC
VENT
Close
Close (Note 1)
NC
NOTE:
1. Open or Closed as Required to Maintain Set Speed Error
VAC (Pin 22)
VENT (Pin 21)
GATE (pin 23)
ACCEL
H
H
L
CRUISE
L
H
L
COAST
L
L
L
BRAKE
L
L
H
REDUNDANT BRAKE
L
L
H
HI-SPEED DROPOUT
L
L
H
LO-SPEED DROPOUT
L
L
H
FIGURE 3. SOLENOID DRIVERS AND SERVO VACUUM CONTROL MECHANISM TYPICAL APPLICATION
10-35
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet CA3228.PDF ] | |
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