1

Features

COILB-

SENSOR

SELECT

Coil

Driver

B

Coil

Driver

A

Overvoltage

and Short

Circuit

Protection

Sequencer

COILA-

COILA+

Input

Comp.

¸ 1

¸ 2

Gnd

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

85mA Dual H-Bridge Odometer Driver

with Divide by Select

1

Gnd

COILA+

COILAÐ

SENSOR

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 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 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 func-

tionÓ. 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

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

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: (401)885-3600 Fax: (401)885-5786

Email: info@cherry-semi.com

Web Site: www.cherry-semi.com

A

Company

¨

Rev. 9/2/92