STK672-610 データシートの表示（PDF） - SANYO -> Panasonic

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STK672-610

2-phase Stepping Motor Driver

SANYO -> Panasonic 

STK672-610

5V

R01

Vref

R3

R02

5V

R01

Vref

R3

R02

• Motor current peak value IOH setting

IOH

0

• When R02 is open

IOH= [Vref×1k/1k+3.9k)] ÷Rs= (Vref÷4.9) ÷Rs

The values 1k and 3.9k represent internal driver resistance values, while Rs represents the internal driver current

detection resistance.

Vref= (4.9k÷ (4.9k+R01)) ×5V (or 3.3V) =IOH×4.9×Rs

The value 4.9k represents the series resistance value of the internal driver values of 1k and 3.9k.

• If R02 is connected

IOH= [Vref×1k/ (1k+3.9k)] ÷Rs= (Vref÷4.9) ÷Rs

The values 1k and 3.9k represent the internal driver resistance values, while Rs represents the internal driver current

detection resistance.

Vref= (R0x÷ (R01+R0x)) ×5V (or 3.3V) =IOH×4.9×Rs

= [(4.9k×R02) ÷ ((4.9k×R02) +R01× (4.9k+R02))] ×5V(or 3.3V)

R0x= (4.9k×R02) ÷ (4.9k+R02)

Rs represents the current detection resistance inside the HIC, while the value 4.9k in the formula above represents the

internal resistance value of the Vref pin.

Rs=0.141Ω when using the STK672-600

Rs=0.089Ω when using the STK672-610

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

Excitation mode selection

Low: 2-phase excitation

High: 1-2 phase excitation

MODE2

17

High: Rising edge

Low: Rising and falling edge

CWB

13

Motor direction switching

Low: CW (forward)

High: CCW (reverse)

RESETB

14

System reset and A, AB, B, and BB outputs cutoff.

A reset is applied by a low level

Applications must apply a reset signal for at least 10μs when

ENABLE

VDD is first applied.

15

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

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

operation is restored by returning the ENABLE pin to the high level input.

level, operation continues with the same excitation timing as

before the low-level input.

(1) A simple reset function is formed from D1, CO4, RO3, and RO4 in this application circuit. With the CLOCK input

held low, when the 5V supply voltage is brought up a reset is applied if the motor output phases A and BB are

driven. If the 5V supply voltage rise time is slow (over 50ms), the motor output phases A and BB may not be driven.

Increase the value of the capacitor CO2 and check circuit operation again.

(2) See the timing chart for the concrete details on circuit operation.

No. A0756-6/19

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