DA6012.000

30 June 2008

OPERATION DESCRIPTION

MAS6012 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.

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 (15 degree angular

rotation of rotor) ahead. Rotation direction is

determined by CW rotation direction selection

signal. High CW selects clockwise direction and low

CW selects counterclockwise direction. Each of the

four stepper motor drivers (A, B, C, D) have their

own FSCX and CW control inputs.

For each of the motors there are four outputs.

Outputs OUTx1 and OUTx2 are for driving first

motor coil and outputs OUTx3 and OUTx4 are for

driving second motor coil where x is one of the four

motor drivers A, B, C or D. The output signal

waveforms consist of digitized sine waves which

have 60° phase shift (see figure 2).

The device has common XRESET master reset

control input for resetting stepper motor outputs to

initial state. The initial state corresponds to step

number 1 state (see figure 2). 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.

MAS6012 Microstepping Output Waveform

-5

-4

-3

-2

-1

0

1

2

3

4

5

0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12.5 13.5 14.5 15.5 16.5 17.5 18.5 19.5 20.5 21.5 22.5 23.5 24.5

Step [No]

OUTx1-OUTx2

OUTx4-OUTx3

Phase shift 60°°°°

(4 steps)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

Figure 2. MAS6012 Microstepping Output Waveform (x=A, B, C or D)