STK672-050

No. 5228—4/11

Motor Current Calculation

Vref is given by the following equation.

where Rs is the built-in current detection resistance (0.2

Ω

± 3%).

The motor current ranges from the current due to the fre-

quency duty set by the oscillator (0.05 to 0.1A) to the

Function Tables

I

OH

---

Vref Rs

⁄

×

=

Motor current waveform

M1

M2

M3

Excitation

Phase switching CLK edge timing

0

0

0

Phase 1-2

Rising and falling edge

0

1

0

Phase 2W1-2

1

0

0

Phase W1-2

1

1

0

Phase 4W1-2

0

0

1

Phase 2

Rising edge only

0

1

1

Phase W1-2

1

0

1

Phase 1-2

1

1

1

Phase 2W1-2

CWB

Direction

0

Forward

1

Reverse

Input

Active level

ENABLE

Low

RESET

Low

Mo1

Mo2

Output

00

A

01

B

10

A

11

B