Datasheet CS8441XN8 Datasheet (Cherry Semiconductor)

1

Features

■ No Cross-conduction in

either H-bridge

■ Divide by 1 and Divide

by 2 Mode

■ Guaranteed Monotonic

■ On Chip Flyback Diodes

■ 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+

COILAÐ

SENSOR

V

CC

COILB+

COILBÐ

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 revolu­tion in the divide by 1 mode; 16 step
sequence in the divide by 2 mode.
The H-Bridge is capable of deliver­ing 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 out­put 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 pro­vided by two functions. The first
being Òshort circuit protectionÓ.
This function will protect the part in
the case of a shorted or partially
shorted load. The second protection
function is the Òovervoltage func­tionÓ. This function monitors the
level of the supply voltage. In tran­sient conditions such as load dump,
the part will shut down, protecting
itself.

Block Diagram

Absolute Maximum Ratings

Supply Voltage (VCC) (continuous) -40ûC to +105ûC ......................Ð0.5 to 24V

(100ms pulse transient) -40ûC to +105ûC ..........................Ð0.5 to 60V

Input Voltage (VIN)..................................................................Ð0.3 to VCC+0.3V

Storage Temperature Range (T

STG

).............................................-65¡C to 150¡C

Junction Temperature Range.......................................................Ð40¡C to 150¡C

ESD (Human Body Model) .............................................................................2kV

Lead Temperature Soldering

Wave Solder(through hole styles only).............10 sec. max, 260¡C peak

Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: [phone] Fax: [phone]

Email: [e-mail]

Web Site: www.cherry-semi.com

A Company

¨

Rev. 9/2/92

V

SENSOR

SELECT

Gnd

¸ 1
¸ 2

Sequencer

Coil

Driver

A

Overvoltage

and Short

Circuit

Protection

Coil

Driver

B

COILA+

COILA-

COILB

+

COILB-

CC

Input

Comp.

2

Electrical Characteristics: Unless otherwise stated, these specifications apply for Ð40¡C²TA²105¡C,6.5V²VCC²15.5V. 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.

■ Supply, V

CC

Supply Voltage Range -40¡C ²TA²105¡C 6.5 15.5 VDC

-40¡C²TA²25¡C 6.5 24.0 VDC
Transient Pulse, 100ms 35.0 VDC

Supply Current VCC= 15.5 VDC 24 35 mA

Outputs not loaded

Overvoltage Shutdown 16 23 V

■ 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 0.8VDC²VIN²V

CC

0.1 ±1.0 µA

Input Voltage Range 0 V

CC

VDC

Operating Input Voltage 10k½ Resistor in Series -15 VDC

to V

CC

Input Clamp Current I Clamp at VIN= 0 VDC -0.4 -5.0 mA

■ Divider Select Input, SELECT

Logic 0 Input Voltage 100 mVDC
Logic 1 Input Voltage 3.0 VDC
Logic 0 Input Current 0V²VIN²100mV -1 -100 µA
Logic 1 Input Current 3V²VIN²15.5 VDC 0.75 2.00 mA

■ Coil Output Drivers

Coil Load +25¡C 198 210 222 ½
Coil Inductance 80 mH
Coil Resistance Temperature Coefficient 0.35 %/¡C
* Energized Coil Voltage

(Both Polarities) A and B VCC= 6.5 VDC VCC-1.5V VCC-0.9V VDC

VCC= 10.0 VDC VCC-1.6V VCC-1.0V VDC
VCC= 15.5 VDC-20¡C²TA²105¡C VCC-1.75V VCC-1.1V VDC
VCC= 15.5 VDC,Ð40¡C²TA²Ð20¡C VCC-2.0V VCC-1.2V VDC

De-Energized Coil Leakage ±100 µA

Current

■ Short Circuit Protection

Short Circuit Threshold 275 400 mA

I Coil A + I Coil B

Short Circuit Turn-Off Delay 5 µs

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 excur­sions above V

CC

as well as any below ground, as long as the cur­rent is limited to 1.5mA. It has an active clamp set to zero volts to
prevent negative input voltages from disrupting normal opera­tion. The sensor input can withstand 150V

DC

as long as the input

current is limited to 1.5mA max using a series resistor of 100k½.

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

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.

8V

CC

Supply Voltage.

Q1

Q2

Short

Circuit

Sense

Resistor

Circuit

Sense

Resistor

Q3

Q4

Short

Coil

Gnd

V

CC

Overvoltage

and

Short

Circuit

Protection

4

Thermal Data 8 Lead

PDIP

R

QJC

typ 52 ûC/W

R

QJA

typ 100 ûC/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+ COILAÐ COILB+ COILBÐ

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 - 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

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.