2-PHASE STEPPER MOTOR DRIVER

M54670P

MITSUBISHI <CONTROL / DRIVER IC>

32

29

30

31

28

27

24

23

22

21

20

19

26

25

18

17

1

4

3

2

5

6

9

10

11

12

13

14

7

8

15

16

DESCRIPTION

The M54670P is a semiconductor IC to drive a bipolar stepper

motor directly by controlling the coil current with the constant

current method.

FEATURES

q Wide operating voltage range (10 – 35V)

q Wide output current control range (20 – 800mA)

q Bipolar and constant current drive

q Built in flywheel

q Current level can be changed by steps or continuously.

q Built in a thermal shutdown circuit

APPLICATION

Office automation equipment such as printer, FDD, HDD, and FAX

FUNCTION

The M54670P can drive a stepper motor by the 2-phase bipolar

method and also control the coil current. Furthermore, it controls

the direction of the coil current with Ph input pins (pins 3 and 30).

The coil current value can be selected among four levels (0 to

max.) by selecting the combination of three internal comparators by

logic input (pins 14, 15, 18 and 19). It also can be continuously

among pins 14, 15, 18 or 19, the operation timing, 2-phase

excitation, 1-2-phase excitation or microstep, can be selected.

Because two control circuits are built in this IC, a stepper motor can

be driven with a single IC by the 2-phase bipolar method.

BLOCK DIAGRAM

2

32

3

4

5

12

13

29

28

21

20

30

31

17

C(B)

22

E(B)

11

E(A)

1

CT

16

C(A)

14

15

10

00

10

01

11

11

01

10

00

6

GND

Comparator input(A)

Triangular wave

Current sensor(A)

Current sensor(B)

Comparator input(B)

Power supply sensor

Triangular

wave

GND

23

Output current value

I0(A)

I1(A)

19

18

setting(B)

I0(B)

TSD

Power supply sensor

setting(A)

Output current value

setting(A)

Output current value

setting(B)

I1(B)

Output current value

Outline 32P4B

CT

Ph(A)

O1(A)

GND

E(A)

O2(A)

I0(A)

I1(A)

C(A)

Ph(B)

O1(B)

GND

E(B)

O2(B)

I0(B)

I1(B)

C(B)

Triangular wave

Comparator

reference input(A)

Output current

direction switching(A)

Output power

supply(A)

Output(A)

Current sensor(A)

Output(A)

Output power

supply(A)

Output current

value setting(A)

Output current

value setting(A)

Comparator

input(A)

Circuit power supply

Comparator

reference input(B)

Output current

direction switching(B)

Output power

supply(B)

Output(B)

Current sensor(B)

Output(B)

Output power

supply(B)

Output current

value setting(B)

Output current

value setting(B)

Comparator

input(B)

PIN CONFIGURATION (TOP VIEW)

27