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CS4161
85mA Dual H-Bridge Odometer Driver
with Divide by Select and UVLO
Description
Features
The CS4161 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.
The CS4161 includes overvoltage
and short circuit protection circuit-
ry. It is lead for lead compatible
with the CS-8441. The CS4161
includes an additional undervoltage
lockout (UVLO) function which dis-
ables the output stage until the sup-
ply voltage rises above 5.6V, typi-
cally. The UVLO has hysteresis to
prevent any power up glitching.
s Undervoltage Lockout
s Cross-conduction
Prevention Logic
s Divide by 1 and Divide
by 2 Modes
s Guaranteed Monotonic
s On Chip Flyback Diodes
s Fault Protection
Overvoltage
Load Dump Protection
to 60V
Absolute Maximum Ratings
Supply Voltage (VCC) (continuous) -40ûC to +105ûC .......................-0.5 to 24V
(100ms pulse transient) -40ûC to +105ûC...........................-0.5 to 60V
Input Voltage (VIN) ...................................................................-0.3 to VCC +0.3V
Operating Temperature Range ....................................................-40¡C to 105¡C
Storage Temperature Range (TSTG) ...........................................-65¡C to 150¡C
Junction Temperature Range .......................................................-40¡C to 150¡C
ESD (Human Body Model) .............................................................................2kV
Lead Temperature Soldering
Wave Solder (through hole styles only)............10 sec. max, 260¡C peak
Package Option
8 Lead PDIP
VCC
SENSOR
Input
Comp.
Block Diagram
Coil
Driver
A
COILA+
COILA-
Gnd 1
COILA+
COILAÐ
SENSOR
VCC
COILB+
COILBÐ
SELECT
SELECT
Gnd
¸1
¸2
Rev. 1/28/97
Sequencer
Overvoltage
and Short
Circuit
Protection
Coil
Driver
B
COILB+
COILB-
1
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

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Electrical Characteristics: Unless otherwise stated, these specifications apply for -40¡C ² TA ² 105¡C, 6.5V ² VCC ² 15.5V.
All voltage shall be referenced to Gnd unless otherwise noted. Overvoltage shutdown of coils occurs when VCC > 16V.
PARAMETER
s Supply, VCC
Supply Voltage Range
Supply Current
Overvoltage Shutdown
Undervoltage Lockout Voltage
TEST CONDITIONS
-40¡C ² TA ² 105¡C
-40¡C ² TA ² 25¡C
Transient Pulse, 100ms
VCC = 15.5 VDC, Outputs not loaded
VCC Initial Power up
UVLO Hysteresis
MIN
6.5
6.5
16
5.1
200
TYP
24
5.6
600
MAX
15.5
24.0
35.0
35
23
6.1
1000
UNIT
VDC
VDC
VDC
mA
V
V
mV
s Speed Sensor Input, SENSOR
Input Frequency Range
Switching Threshold
Hysteresis
Input Bias Current
Input Voltage Range
Operating Input Voltage
Input Clamp Current
0.8VDC ² VIN ² VCC
10k½ Resistor in Series
I Clamp at VIN = 0VDC
0.2 1.0 kHz
1.2 2.6 VDC
300 500
mVDC
0.1 ±1.0 µA
0
VCC
VDC
-15 to VCC VDC
-0.4 -5.0 mA
s Divider Select Input, SELECT
Logic 0 Input Voltage
Logic 1 Input Voltage
Logic 0 Input Current
Logic 1 Input Current
0V ² VIN ² 100mV
3V ² VIN ² 15.5 VDC
100 mVDC
3.0 VDC
-1 -100 µA
0.75 2.00 mA
s Coil Output Drivers
Coil Load
+25¡C
Coil Inductance
Coil Resistance Temperature
Coefficient
* Energized Coil Voltage
VCC = 6.5 VDC
(Both Polarities) A and B
VCC = 10.0 VDC
VCC = 15.5 VDC, -20¡C ² TA ² 105¡C
VCC = 15.5 VDC, -40¡C ² TA ² -20¡C
De-energized Coil Leakage Current
198 210
80
VCC - 1.5V VCC - 0.9V
VCC - 1.6V VCC - 1.0V
VCC - 1.75V VCC - 1.1V
VCC - 2.0V VCC - 1.2V
±100
222
0.35
µA
½
mH
%/¡C
VDC
VDC
VDC
VDC
s Short Circuit Protection
Short Circuit Threshold
I Coil A + I Coil B
Short Circuit Turn-Off Delay
275 400 mA
5 µs
* Voltage across the coils shall be measured at the specific voltages, but shall also be within linearly interpolated limits.
Package Lead Description
PACKAGE LEAD #
8L PDIP
1
2
3
4
5
6
7
8
LEAD SYMBOL
FUNCTION
Gnd
COILA+
COILA-
SENSOR
SELECT
COILB-
COILB+
VCC
Ground connection.
Output stage, when active, this lead supplies current to COIL A.
Output stage, when active, this lead supplies current to COIL A.
Input signal from wheel speed or engine rpm.
Selects divide by 1 or divide by 2 mode.
Output stage, when active, this lead supplies current to COIL B.
Output stage, when active, this lead supplies current to COIL B.
Supply Voltage.
2

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Circuit Operation
Speed Sensor Input
SENSOR is a PNP comparator input which accepts either a sine
wave or a square wave input. This input is protected from excur-
sions above VCC 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 150VDC as long as the input
current is limited to 1.5mA max. using a series resistor of 100k½.
Coil Driver Outputs
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 the Transition States section.
The transition states occur as indicated in Table 1 without any
intermediate states permitted.
Table 1: Transition States
State
0
1
2
3
4
5
6
7
Output State Table
Coil A
+
OFF
-
-
-
OFF
+
+
Coil B
+
+
+
OFF
-
-
-
OFF
The polarity definition for the coil driver outputs is as follows:
Polarity
Positive (+)
Negative (-)
Connect
Coil +
VCC
Gnd
Connect
Coil -
Gnd
VCC
Divider Select Input
The speed sensor input frequency is either divided by one or divid-
ed by two depending on the state of the SELECT input as follows:
Logic 0 = divide by 2
Logic 1 = divide by 1
Short
Circuit
VCC
Sense
Q1 Q3 Resistor
Overvoltage
and
Short
Circuit
Coil Protection
Q2 Q4 Short
Circuit
Gnd
Sense
Resistor
Figure 1: Coil Driver Output
Figure 2: Divide by 1 SELECT Mode
DIVIDE BY TWO MODE SELECT = Gnd
Figure 3: Divide by 2 SELECT Mode
Odometer Application Diagram
COIL A
COIL B
C1 - 10µF
C2 - 0.1µF
C3 - 0.01µF
R1 - 3.9½, 500mW
R2 - 100k½
R3 - 15k½
D1 - 1A, 600PIV
Z1 - 50V, 500mW
COIL A - 210 ±12½, 80mH
COIL B - 210 ±12½, 80mH
IGN
D1 R1
Buffered Speed Signal
(Open Collector Drive)
Z1
R3
R2
COILA+ COILAÐ COILB+ COILBÐ
CS4161
SENSOR
VCC SELECT
Gnd
C1 C2
C3
3

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Package Specification
PACKAGE DIMENSIONS IN mm (INCHES)
PACKAGE THERMAL DATA
Lead Count
8L PDIP
Metric
Max Min
10.16 9.02
D
English
Max Min
.400 .355
Thermal Data
RQJC
typ
RQJA
typ
8L PDIP
52
100
ûC/W
ûC/W
Plastic DIP (N); 300 mil wide
7.11 (.280)
6.10 (.240)
3.68 (.145)
2.92 (.115)
8.26 (.325)
7.62 (.300)
1.77 (.070)
1.14 (.045)
2.54 (.100) BSC
.356 (.014)
.203 (.008)
REF: JEDEC MS-001
0.39 (.015)
MIN.
.558 (.022)
.356 (.014)
D
Some 8 and 16 lead
packages may have
1/2 lead at the end
of the package.
All specs are the same.
Ordering Information
Part Number
CS4161XN8
Description
8L PDIP
Rev. 1/28/97
Cherry Semiconductor Corporation reserves the
right to make changes to the specifications without
notice. Please contact Cherry Semiconductor
Corporation for the latest available information.
4 © 1999 Cherry Semiconductor Corporation