CS-8442N8 [ETC]
Stepper Motor Controller/Driver ; 步进电机控制器/驱动器\n
| 型号： | CS-8442N8 |
| 厂家： | 
ETC |
| 描述： | Stepper Motor Controller/Driver
|
| 文件： | 总4页 (文件大小：79K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CS8442
Stepper Motor Driver
with Buffered Speed Signal Output
Features
Description
The CS8442 is a stepper motor
transistors from excessive fly back
ꢀ Buffered Speed Sensor
driver that implements an H-
bridge design to drive two coils in
an eight step sequence each revo-
lution. Each H-bridge is capable of
delivering 85mA to the load.
voltages.
Output
The CS8442 is fault protected
against reverse battery, short cir-
cuit, and over voltage conditions.
If a fault is detected, the IC shuts
down.
The buffered speed signal output
(SENSOR OUT) is an open collec-
tor NPN capable of driving a
4.7kΩ load connected to a 5V sup-
ply. The signal is a buffered,
inverted version of the speed sen-
sor input voltage (SENSOR IN).
The input voltage can be either a
sine or square wave form.
ꢀ No Cross-conduction in
either H-bridge
ꢀ Guaranteed Monotonic
On Chip Flyback Diodes
ꢀ
The sequencer function insures
that the odometer is monotonic
and that cross-conduction of each
H bridges does not occur. Before
the beginning of each sequence,
both bridges are turned off. This
“dead zone” minimizes the fly
back energy generated in the
inductive loads. In addition, on
board clamp diodes across each
output protect the output drive
ꢀ Fault Protection
Overvoltage
Short Circuit Protection
Load Dump Protection
to 60V
Absolute Maximum Ratings
Supply Voltage (VCC) (continuous) -40˚C to +105˚C ..................–0.5 to 24V
(100ms pulse transient) -40˚C to +105˚C ......................–0.5 to 60V
Input Voltage (VIN) ..............................................................–0.3 to VCC +0.3V
Storage Temperature Range (TSTG)......................................–65°C to +150°C
Junction Temperature.............................................................–40°C to +150°C
Speed Sensor Output .....................................................................................7V
ESD (Human Body Model) .........................................................................2kV
Lead Temperature Soldering
Package Options
8 Lead PDIP
Wave Solder (through hole styles only)........10 sec. max, 260°C peak
1
Gnd
VCC
Block Diagram
COILA+
COILA–
COILB+
COILB–
SENSOR
IN
SENSOR
OUT
Coil
Driver
A
Input
Comp.
COILA+
COILA-
SENSOR
IN
Overvoltage
and Short
Circuit
Sequencer
Protection
SENSOR
OUT
Coil
Driver
B
COILB
+
COILB-
ON Semiconductor
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885–3600 Fax: (401)885–5786
N. American Technical Support: 800-282-9855
Web Site: www.cherry–semi.com
Rev. 3/23/00
1
Electrical Characteristics: Unless otherwise stated, these specifications apply for -40˚C to +105˚C, VCC = 6.5 to 15.5 VDC. All
voltage shall be referenced to Gnd unless otherwise noted. Overvoltage shutdown of coils occurs when VCC > 16V.
PARAMETER
ꢀ Supply
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Supply Voltage Range
TA = -40°C to +105°C
TA = -40°C to +25°C
6.5
6.5
15.5
24.0
35
α
α
mA
Supply Current
V
CC = 15.5 VDC
Outputs not loaded
Overvoltage Shutdown
16
23
V
ꢀ Speed Sensor
Input Frequency Range
Switching Threshold
Hysteresis
0
1.6
300
400
3.0
Hz
VDC
mV
Input Bias Current
Input Voltage Range
Operating Input Voltage
VIN = 0.8VDC to VCC
10K Ohm Resistor in Series
ICC = 1.3mA
±1
8
µA
VDC
VDC
0
-15
to VCC
Output Saturation Voltage
0.4
V
Output Leakage
VCC = 5.5V
10
µA
Input Clamp Current
I Clamp at VIN = 0 VDC
-0.4
210
-5.0
mA
ꢀ Coil Output Drivers
Coil Load
+25°C
198
222
80
0.39
Ω
mH
%/°C
Coil Inductance
Coil Resistance Temperature Coefficient
* Energized Coil Voltage
(Both Polarities) A and B VCC = 6.5 VDC
VCC - 1.50
VCC - 1.60
VDC
VDC
VDC
VDC
V
CC = 10.0 VDC
VCC = 15.5 VDC, T = -20°C to +105°C VCC - 1.75
VCC = 15.5 VDC, TAA= -40°C to -20°C VCC - 2.00
De-Energized Coil Leakage
Current
±100
400
µA
ꢀ Short Circuit Protection
Short Circuit Threshold
Coil A + Coil B
Short Circuit Turn Off Delay
275
5
mA
µs
* Voltage across the coils shall be measured at the specific voltages, but shall also be within linearly interpolated limits.
2
Package Pin Description
PIN SYMBOL
PACKAGE PIN #
FUNCTION
8L PDIP
1
Gnd
Ground connection.
2
3
4
5
6
7
8
COILA+
COILA-
SENSOR IN
SENSOR OUT
COILB-
COILB+
VCC
Output stage, when active, supplies current to COIL A.
Output stage, when active, supplies current to COIL A.
Input signal from wheel speed or engine rpm.
Buffered and inverted output of SENSOR IN signal.
Output stage, when active, supplies current to COIL B.
Output stage, when active, supplies current to COIL B.
Supply Voltage.
Application Information
Table 1: Transition States
Output State Table
Speed Sensor
SENSOR IN is a PNP comparator input that accepts a sine or
square wave input. Signals in excess of VCC or Ground will not
damage the input as long as the input current is limited to
1.5mA. An active clamp at 0V prevents negative input voltages
from disrupting normal operation. The input can withstand 150
VDC as long as the input current does not exceed 1.5mA. This is
possible if a 100kΩ resistor is placed in series with the SENSOR
IN.
State
Coil A
Coil B
0
1
2
3
4
5
6
7
+
+
OFF
+
-
+
-
-
OFF
-
OFF
+
-
-
+
OFF
SENSOR OUT is an open collector NPN transistor that produces
a buffered and inverted version of the SENSOR IN signal. It is
capable of driving a 4.7kΩ load connected to a 5V supply.
The polarity definition for the coil driver outputs is as follows:
Connect
Coil +
VCC
Connect
Coil -
Gnd
Polarity
Positive (+)
Negative (-)
Gnd
VCC
Sequencer
H Bridge Outputs A and B
The eight step sequencer moves the two H bridge output drivers
through 8 sequential states (Table 1, Figure 1). In State 0, current
flows from COILA+ out through COIL A and back in through
COILA-. The same polarity also holds for COIL B. In State 1,
COIL A outputs turn off while COIL B outputs continue con-
ducting with the same polarity. In State 2, current flows from
COIL A- out through the coil and back in COIL A+. COIL B out-
puts continue with their original polarity. COIL A outputs
maintain this polarity through States 3 and 4 during which
COIL B outputs are first turned off and then reversed. COIL B’s
reversed polarity continues in Stages 5 and 6. COIL A’s outputs
are turned off in Stage 5 and then turned back on (positive
polarity) in Stage 6. In Stage 7, COIL B is off and COILA outputs
continue with a positive polarity.
Each H-bridge output stage consists of 4 power NPN transistors
with fly back diodes (Figure 2). Each half bridge has a composite
saturation voltage of 1.5V at VCC=15.5V and IOUT = 85mA.
The output stage is designed to prevent cross conduction: i.e., at
no time can Q1 and Q2 or Q3 and Q4 conduct. This dead zone
time minimizes fly back energy and helps protect the output
stages from damage.
Protection Circuitry
The CS8442 is protected from short circuit, over voltage and
thermal runaway conditions. When any of these faults is detect-
ed, an internal flip-flop is set and both H bridges are disabled.
When the fault condition is removed, the Flip-Flop is reset after
the first positive going edge from the speed sensor input.
0
1
2
3
4
5
6
7
0
STATE
#
Short
Circuit
VCC
+
Sense
Resistor
Q1
Q2
Q3
Q4
COIL A
COIL B
Overvoltage
and
–
+
–
Short
Coil
Circuit
Protection
Short
Circuit
Gnd
Sense
Resistor
Figure 1: State Diagram for Coil Outputs
Figure 2: Coil Driver Output
3
Application Diagram
C1 - 10µF
C2 - 0.1µF
C3 - 0.01µF
COILA+ COILA–
COILB+ COILB–
SENSOR IN
R1 - 3.9Ω 0.5W
R2 - 100kΩ
R3 - 15kΩ
D1 - 1A 600PIV
Z1 - 50V 0.5W
COIL A - 210±12Ω, 80mH
COIL B - 210±12Ω, 80mH
CS8442
V
CC
SENSOR OUT
Gnd
D1
R1
IGN
C2
C1
Z1
R3
Buffered Speed Signal
(Open Collector Drive)
R2
C3
Package Specification
PACKAGE DIMENSIONS IN mm (INCHES)
PACKAGE THERMAL DATA
8L PDIP
D
Thermal Data
Lead Count
Metric
English
RΘJC
RΘJA
typ
typ
52
100
˚C/W
˚C/W
Max
10.16
Min
9.02
Max
.400
Min
.355
8L PDIP
Plastic DIP (N); 300 mil wide
7.11 (.280)
6.10 (.240)
1.77 (.070)
1.14 (.045)
8.26 (.325)
7.62 (.300)
2.54 (.100) BSC
3.68 (.145)
2.92 (.115)
0.39 (.015)
MIN.
.356 (.014)
.203 (.008)
.558 (.022)
.356 (.014)
Some 8 and 16 lead
packages may have
1/2 lead at the end
of the package.
REF: JEDEC MS-001
D
All specs are the same.
ON Semiconductor and the ON Logo are trademarks of
Semiconductor Components Industries, LLC (SCILLC). ON
Semiconductor reserves the right to make changes without
further notice to any products herein. For additional infor-
mation and the latest available information, please contact
your local ON Semiconductor representative.
Ordering Information
Part Number
Description
8L PDIP
CS8442XN8
Rev. 3/23/00
4
© Semiconductor Components Industries, LLC, 2000
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