Cherry Semiconductor CS8441XN8 Datasheet

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