DA9012.001

25 August 2004

3 (12)

OPERATION DESCRIPTION

MAS9012 is a stepper motor driver IC specifically

designed to drive bipolar stepper motors of pointers

in a car and motorcycle dashboard and in the other

similar applications. It has four different device

versions: A1, A2, A3 and A4 with single, dual, triple

and quad stepper motor driver outputs respectively

(see block diagrams on page 2).

The IC is operated from single 5V supply. Each

stepper motor output is controlled by two digital

control signal inputs, FSCX and CW. Each rising

edge of FSCX stepping clock input causes stepper

motor to step one microstep (1/12 degree) ahead.

Rotation direction is determined by CW rotation

direction selection signal. High CW selects

clockwise

direction

and

low

CW

selects

counterclockwise direction. Each stepper motor has

its own FSCX and CW signal inputs.

The device has common XRESET master reset

control input for resetting stepper motor outputs to

initial state. XRESET is active low. Each digital

input has a glitch filter for eliminating effects of

electrical disturbances at the control inputs.

It is recommended to keep XRESET signal low

(active) during power up until the supply voltage

VDD has risen up.