STK672-622A-E

No. A1995-6/23

[Smoke Emission Precuations]

If Pin 18 (S.G terminal) is attached to the PCB without using solder, overcurrent may flow into the MOSFET at

VCCON (24V ON), causing the STK672-622A-E to emit smoke because 5V circuits cannot be controlled.

Input Pin Functions

Pin Name

Pin No.

Function

Input Conditions When Operating

CLOCK

12

Reference clock for motor phase current switching

Operates on the rising edge of the signal (MODE2=H)

MODE1

10

Low: 2-phase excitation

High: 1-2 phase excitation

MODE2

17

Excitation mode selection

High: Rising edge

Low: Rising and falling edge

CWB

13

Motor direction switching

Low: CW (forward)

High: CCW (reverse)

RESETB

14

System reset

Initial state of A and BB phase excitation in the timing

charts is set by switching from low to high.

A reset is applied by a low level

ENABLE

15

The A, AB, B, and BB outputs are turned off, and after

operation is restored by returning the ENABLE pin to the

high level, operation continues with the same excitation

timing as before the low-level input.

The A, AB, B, and BB outputs are turned off by a low-

level input.

Output Pin Functions

Pin Name

Pin No.

Function

Input Conditions When Operating

FAULT1

16

Monitor pin used when over-current detection or overheat

detection function is activated.

Low level is output when detected.

FAULT2

8

The output voltage of this pin differs according to the

detected abnormality.

2 levels output

Note: See the timing chart for the concrete details on circuit operation.