STK672-740B-E

No. A1932-6/23

• Motor current peak value IOH setting

IOH=(Vref÷4.9) ÷Rs

The value of 4.9 in Equation above represents the Vref voltage as divided by a circuit inside the control IC.

Vref=(R02

÷ (R01+R02)) ×5V(or 3.3V)

Rs is an internal current detection resistor value of the hybrid IC.

Rs=0.089

Ω when using the STK672-740B-E

Input Pin Functions

Pin Name

Pin No.

Function

Input Conditions When Operating

φA

13

Pin 5, phase A output

φAB

17

Pin 7, phase AB output

φB

12

Pin 3, phase B output

φBB

10

Pin 1, phase BB output

Low active (with a function to prevent simultaneous

ON of

φA and φAB, or φB and φBB)

RESETB

14

System reset

A reset is applied by a low level

ENABLE

15

A, AB, B, and, BB outputs cut off

A, AB, B, and BB outputs are cut off by a low level

Output Pin Functions

Pin Name

Pin No.

Function

Input Conditions When Operating

FAULT1

16

Monitor pin when any of motor terminal open, overcurrent,

or overheat is detected.

Low level is output when detected.

FAULT2

8

Monitor pin used when over-current detection or overheat

detection function is activated.

3 levels output

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

IOH

0