1
Features
COILB-
SENSOR
SELECT
Coil
Driver
B
Coil
Driver
A
Overvoltage
and Short
Circuit
Protection
Sequencer
COILB
+
COILA-
COILA+
Input
Comp.
1
2
Gnd
V
CC
s
No Cross-conduction in
either H-bridge
s
Divide by 1 and Divide
by 2 Mode
s
Guaranteed Monotonic
s
On Chip Flyback Diodes
s
Fault Protection
Overvoltage
Load Dump Protection
to 60V
Package Options
8 Lead PDIP
CS8441
85mA Dual H-Bridge Odometer Driver
with Divide by Select
1
Gnd
COILA+
COILA
SENSOR
V
CC
COILB+
COILB
SELECT
CS8441
Description
The CS8441 is a Stepper Motor
Driver that implements an H-Bridge
design in order to drive two coils in
an eight step sequence per revolu-
tion in the divide by 1 mode; 16 step
sequence in the divide by 2 mode.
The H-Bridge is capable of deliver-
ing 85mA to the load.
The sequencer insures that the
odometer is monotonic. This
sequencer is configured such that
simultaneous conduction does not
occur. Before each successive out-
put sequence the part is taken
through a state where both outputs
are turned off individually. This
tends to minimize the inductive
kick back energy that the part must
absorb. On chip clamp diodes are
across each output to protect the
part from the kick back energy that
it must absorb.
Additional part protection is pro-
vided by two functions. The first
being short circuit protection.
This function will protect the part in
the case of a shorted or partially
shorted load. The second protection
function is the overvoltage func-
tion. This function monitors the
level of the supply voltage. In tran-
sient conditions such as load dump,
the part will shut down, protecting
itself.
Block Diagram
Absolute Maximum Ratings
Supply Voltage (V
CC
) (continuous) -40C to +105C ......................0.5 to 24V
(100ms pulse transient) -40C to +105C ..........................0.5 to 60V
Input Voltage (V
IN
) ..................................................................0.3 to V
CC
+0.3V
Storage Temperature Range (T
STG
).............................................-65C to 150C
Junction Temperature Range.......................................................40C to 150C
ESD (Human Body Model) .............................................................................2kV
Lead Temperature Soldering
Wave Solder(through hole styles only).............10 sec. max, 260C peak
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
A Company
Rev. 9/2/92
2
Electrical Characteristics: Unless otherwise stated, these specifications apply for 40CT
A
105C,6.5VV
CC
15.5V. All voltage
shall be referenced to Gnd unless otherwise noted. Overvoltage shutdown of coils occurs when V
CC
> 16V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CS8441
* Voltage across the coils shall be measured at the specific voltages, but shall also be within linearly interpolated limits.
s Supply, V
CC
Supply Voltage Range
-40C T
A
105C
6.5
15.5
VDC
-40CT
A
25C
6.5
24.0
VDC
Transient Pulse, 100ms
35.0
VDC
Supply Current
V
CC
= 15.5 VDC
24
35
mA
Outputs not loaded
Overvoltage Shutdown
16
23
V
s Speed Sensor Input, SENSOR
Input Frequency Range
0.2
1.0
kHz
Switching Threshold
1.2
2.4
VDC
Hysteresis
300
500
mVDC
Input Bias Current
0.8VDCV
IN
V
CC
0.1
1.0
A
Input Voltage Range
0
V
CC
VDC
Operating Input Voltage
10k Resistor in Series
-15
VDC
to V
CC
Input Clamp Current
I Clamp at V
IN
= 0 VDC
-0.4
-5.0
mA
s Divider Select Input, SELECT
Logic 0 Input Voltage
100
mVDC
Logic 1 Input Voltage
3.0
VDC
Logic 0 Input Current
0VV
IN
100mV
-1
-100
A
Logic 1 Input Current
3VV
IN
15.5 VDC
0.75
2.00
mA
s Coil Output Drivers
Coil Load
+25C
198
210
222
Coil Inductance
80
mH
Coil Resistance Temperature
Coefficient
0.35
%/C
* Energized Coil Voltage
(Both Polarities) A and B
V
CC
= 6.5 VDC V
CC
-1.5V
V
CC
-0.9V
VDC
V
CC
= 10.0 VDC V
CC
-1.6V
V
CC
-1.0V
VDC
V
CC
= 15.5 VDC-20CT
A
105C V
CC
-1.75V
V
CC
-1.1V
VDC
V
CC
= 15.5 VDC,40CT
A
20C V
CC
-2.0V
V
CC
-1.2V
VDC
De-Energized Coil Leakage
100
A
Current
s Short Circuit Protection
Short Circuit Threshold
275
400
mA
I Coil A + I Coil B
Short Circuit Turn-Off Delay
5
s
3
Figure 2: Divide by 1 SELECT Mode
CS8441
SENSOR is a PNP comparator input which accepts a sine wave
input or a square wave input. This input is protected from excur-
sions above V
CC
as well as any below ground, as long as the cur-
rent is limited to 1.5mA. It has an active clamp set to zero volts to
prevent negative input voltages from disrupting normal opera-
tion. The sensor input can withstand 150V
DC
as long as the input
current is limited to 1.5mA max using a series resistor of 100k.
Simultaneously energizing the source and sink on either leg is
not permitted. i.e. Q1 & Q2 or Q3 & Q4 cannot be energized
simultaneously.
Circuit function is not affected by inductive transients due to coil
loads as specified in Transition States section.
The transition states occur as indicated in Table 1 without any
intermediate states permitted.
Table 1: Transition States
The polarity definition for the coil driver outputs is as follows:
Connect
Connect
Polarity
Coil +
Coil -
Positive (+)
V
CC
Gnd
Negative (-)
Gnd
V
CC
The speed sensor input frequency is divided by one or divided
by two by connecting the divider select input, (Pin 5) as follows:
Logic 0 = divide by 2
Logic 1 = divide by 1
Circuit Operation
Speed Sensor Input
Coil Driver Outputs
Divider Select Input
Short
Circuit
V
CC
Sense
Resistor
Coil
Short
Circuit
Sense
Resistor
Gnd
Q3
Q4
Q1
Q2
Overvoltage
and
Short
Circuit
Protection
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
Figure 1: Coil Driver Output
Figure 3: Divide by 2 SELECT Mode
Output State Table
State
Coil A
Coil B
0
+
+
1
OFF
+
2
-
+
3
-
OFF
4
-
-
5
OFF
-
6
+
-
7
+
OFF
DIVIDE BY ONE MODE SELECT = V
CC
DIVIDE BY TWO MODE SELECT = Gnd
8L PDIP
1
Gnd
Ground connection.
2
COILA+
Output stage, when active, this pin supplies current to COIL A.
3
COILA-
Output stage, when active, this pin supplies current to COIL A.
4
SENSOR
Input signal from wheel speed or engine rpm.
5
SELECT
Selects divide by 1 or divide by 2 mode.
6
COILB-
Output stage, when active, this pin supplies current to COIL B.
7
COILB+
Output stage, when active, this pin supplies current to COIL B.
8
V
CC
Supply Voltage.
4
Thermal Data
8 Lead
PDIP
R
QJC
typ
52
C/W
R
QJA
typ
100
C/W
D
Lead Count
Metric
English
Max
Min
Max
Min
8L PDIP
10.16
9.02
.400
.355
Package Specification
PACKAGE DIMENSIONS IN mm (INCHES)
Ordering Information
PACKAGE THERMAL DATA
Rev. 9/2/92
CS8441
Part Number
Description
CS8441XN8
8 Lead PDIP
COILA+
COILA
COILB+
COILB
V
CC
SELECT
Gnd
SENSOR
CS8441
IGN
D1
R1
R3
Z1
C1
C2
R2
C3
Buffered Speed Signal
(Open Collector Drive)
COIL A
COIL B
Odometer Application Diagram
C1 - 10F
C2 - 0.1F
C3 - 0.01F
R1 - 3.9, 500mW
R2 - 100k
R3 - 15k
D1 - 1A, 600PIV
Z1 - 50V, 500mW
COIL A - 21012, 80mH
COIL B - 21012, 80mH
0.39 (.015)
MIN.
2.54 (.100) BSC
1.77 (.070)
1.14 (.045)
D
Some 8 and 16 lead
packages may have
1/2 lead at the end
of the package.
All specs are the same.
.203 (.008)
.356 (.014)
REF: JEDEC MS-001
3.68 (.145)
2.92 (.115)
8.26 (.325)
7.62 (.300)
7.11 (.280)
6.10 (.240)
.356 (.014)
.558 (.022)
Plastic DIP (N); 300 mil wide
1999 Cherry Semiconductor Corporation
Cherry Semiconductor Corporation reserves the
right to make changes to the specifications without
notice. Please contact Cherry Semiconductor
Corporation for the latest available information.
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