© Semiconductor Components Industries, LLC, 2001

February, 2001 – Rev. 3

1

Publication Order Number:

CS8441/D

CS8441

Stepper Motor Driver

with Divide by Select

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 85 mA 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 “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 function.” This function monitors the

level of the supply voltage. In transient conditions such as load dump,

the part will shut down, protecting itself.

Features

SENSOR

Input

Comp.

Sequencer

Overvoltage

and

Short Circuit

Protection

GND

SELECT

COILA+

COILA–

COILB+

COILB–

Coil

Driver

A

Coil

Driver

B

B 1

B 2

Figure 1. Block Diagram

http://onsemi.com

A

= Assembly Location

WL, L

= Wafer Lot

YY, Y

= Year

WW, W = Work Week

PIN CONNECTIONS AND

MARKING DIAGRAM

DIP–8

N SUFFIX

CASE 626

1

8

COILB+

COILB–

SELECT

GND

COILA+

COILA–

SENSOR

1

8

Device

Package

Shipping

ORDERING INFORMATION

CS8441YN8

DIP–8

50 Units/Rail