DA9012.001
25 August 2004
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.
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MAS [ MICRO ANALOG SYSTEMS ]
