Intersil Corporation CA3228 Datasheet
June 1999
OBSOLETE PRODUCT
NO RECOMMENDED REPLACEMENT
Call Central Applications 1-800-442-7747
or email: centapp@harris.com
Speed Control System with Memory
CA3228
Features
• Low Power Dissipation
2
L Control Logic
•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
Controls
• Industrial AC and DC Motor Speed Control
• Applications Requiring Acceleration and Deceleration
Control
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 reference 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.
Pinout
DRIVER COMMAND
COMMAND DELAY
OSCILLATOR
V MEMORY
CURRENT SENSE SPEED
SENSOR INPUT
F/V OUT
F/V FILTER
BRAKE INPUT
GND
NC
V
CA3228 (PDIP)
1
2
3
4
5
6
7
8
9
10
11
S
12
TOP VIEW
24
GND
OUTPUT GATE
23
VACUUM CONTROL
22
VENT CONTROL
21
CONTROL AMP+
20
CONTROL AMP OUTPUT
19
18
CONTROL AMP-
17
ALIGN
16
V ERROR
15
ACCELERATE CAPACITOR
14
ACCELERATE RESISTOR
13
V
CC
Ordering Information
PART
NUMBER TEMPERATURE PACKAGE
CA3228E -40oC to +85oC 24 LeadPlastic 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
Specifications CA3228
Absolute Maximum Ratings Thermal Information
Supply Voltage, VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +9.0V
Supply Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
Driver Command Input (I
Brake Input (I
), Pin 12. . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA
BRAKE
), Pin 3 . . . . . . . . . . . . . . . . . . . . 2mA
CMD
Storage Temperature Range . . . . . . . . . . . . . . . . -65oC to +150oC
Maximum Junction Temperature. . . . . . . . . . . . . . . . . . . . . +150oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Typical Switching Characteristics
Driver Command Input Hold Times (Based on 0.68µF on Pin 4):
ACCEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ms
COAST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ms
RESUME. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330ms
Thermal Resistance θ
JA
Plastic DIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65oC/W
Power Dissipation Per Package
For TA = -40oC to +70oC . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2mW
For TA Above +70oC . . . . . . . . . . . Derate Linearly at 15.4mW/oC
Lead Temperature (Soldering 10s) . . . . . . . . . . . . . . . . . . . +265oC
Operating Temperature Range . . . . . . . . . . . . . . . . -40oC to +85oC
ON. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ms
OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ms
Internal Oscillator Frequency, F
. . . . . . . . . . . . . . . . . . . 10kHz
OSC
(Based on 0.001µF at Pin 5)
System Performance F
Speed Sensor Input Frequency Range, fS at Pin 8 . .62Hz to 222Hz
Speed Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.45 mph
= 50kHz, fS/Speed Ratio = 2.22Hz/mph
OSC
Maximum Stored Speed . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mph
Redundant Brake Speed. . . . . . . . . . . . . . . . . . . . . . . . . . . 11 mph
Minimum Operating Speed. . . . . . . . . . . . . . . . . . . . . . . . . . 25 mph
Electrical Specifications T
= +25oC, VCC = 8.20V, Unless Otherwise Specified (Refer to Figures 2 and 3)
A
PARAMETERS SYMBOLS TEST PIN TEST CONDITIONS MIN MAX UNITS
Operating Voltage V
CC
13 7.40 9.00 V
Speed Sensor Input Voltage Amplitude T.P.B. 62Hz ≤ fS≤ 222Hz 3.50 15.0 Vpp
VCC Supply Current I
Current Sense Voltage V
Align Voltage V
Command Idle Voltage V
CC
7
17
3IDLE
13 7.50 30.0 mA
7 43kΩ to Ground 4.85 5.95 V
17 41kΩ to Ground 4.00 4.20 V
3 S1, S2, S3, S4, S5
7.6 7.9 V
Open
RESUME Command Voltage V
ACCEL Command Voltage V
COAST Command Voltage V
OFF Voltage V
3RES
3ACCEL
3COAST
3OFF
3 S2 Closed 5.95 6.56 V
3 S3 Closed 3.95 4.91 V
3 S4 Closed 1.22 2.23 V
3 S5 Closed 0 0.77 V
ON Voltage V
Brake Input Voltage V
OUTPUT VOTLAGE
Gate V
VAC V
VENT V
3ON
BRAKE
OL
V
OH
OL
V
OH
OL
V
OH
T.P.A. S1 Closed 9.2 28 V
12 S6 Closed 5.4 28 V
23 4.7kΩ to V
CC
- 300 mV
8-V
22 1.2kΩ to V
CC
- 400 mV
8-V
21 1.2kΩ to V
CC
- 400 mV
8-V
10-32
Specifications CA3228
Electrical Specifications T
= +25oC, VCC = 8.20V, Unless Otherwise Specified (Refer to Figures 2 and 3) (Continued)
A
PARAMETERS SYMBOLS TEST PIN TEST CONDITIONS MIN MAX UNITS
Memory Set Error V6 - V
Deadband Range (VAC and VENT Outputs
Off)
Control Amplifier Gain A
D/A Voltage Range V
Functional Block Diagram
V
CC
DRIVER COMMAND
COMMAND DELAY
OSCILLATOR
BRAKE INPUT
SPEED
SENSOR INPUT
F/V OUT
F/V FILTER
V
V MEMORY
CURRENT
SENSE
3
3
4
5
12
8
9
10
11
S
6
7
V
CC
COMMAND
DECODER
AND
DELAY
OSC.
BRAKE
SENSOR
F/V
CONVERTER
V
S
V
M
CURRENT
SENSE
RESUME
ACCEL
COAST
ON
TOGL
OFF
OVER SPEED
DETECTOR
V
S
10
V
DB
CNTL
M
MINIMUM
SPEED
SENSOR
ANALOG TO
DIGITAL TO
ANALOG
CONVERTER
6, 10 -77 67 mV
21, 22 Sweep Pin 19,
0.96 1.43 V
Voltage at 1V/sec
16, 19 A
= V19/V16 74 - Ratio
CNTL
6 Set Mode 6 7.50 V
GROUND
CONTROL
LOGIC
2
I
L
241
RESUME
DETECTOR
REDUNDANT
BRAKE
“C”
V
M
“B”
“A”
MODE
ALIGN
SW
“D”
GATE
VENT
VAC
+
CONTROL AMP.
_
ERROR AMP.
0.45V
“E”
ACCEL.
RATE AMP
OUTPUT
23
GATE
VENT
21
CONTROL
VACUUM
22
CONTROL
CONTROL AMP.
19
OUTPUT
20
CONTROL AMP. (+)
18
CONTROL AMP. (-)
16
V ERROR
ACCELERATE
14
RESISTOR
ACCELERATE
15
CAPACITOR
ALIGN
17
10-33
Loading...