STK672-080 datasheet(6/17 Pages) SANYO

6 / 17 page

No. 6507-6/17

STK672-080

Two-phase stepping motor

VCC2=5V

Vref

Ro1

Ro2

VCC2=5V

CLK

ENABLE

CBW

≈ 0.3V

RESET

MoI

VCC1=10V to 45V

STK672-080

A13261

RoX

Ioave

IOL IOH

Motor current waveform

A13262

Simplified power-on reset circuit

(This circuit cannot be used to detect

drops in the power-supply voltage.)

A value of about 100

Ω is recommended for

RO2 to minimize the influence of the Vref

pin internal impedance, which is 6 k

Ω.

ROX: The input impedance is 6 kΩ ±30%.

Power-on reset

The application must perform a power-on reset operation when VCC2 power is first applied to this hybrid IC.

Application circuit that used 2W1-2 phase excitation (microstepping operation) mode.

Setting the Motor Current

The motor current IOH is set by the Vref voltage on the hybrid IC pin 7. The following formula gives the relationship

between IOH and Vref.

ROX = (RO2 × 6 kΩ) ÷ (RO2 + 6 kΩ) ·············(1)

Vref = VCC2 × ROX ÷ (RO1 + ROX) ··············(2)

Vref

IOH = — × —— ·············································(3)

K: 4.7 (Voltage division ratio), Rs: 0.15

Ω (The hybrid IC’s internal current detection resistor (precision: ±3%)

Applications can use motor currents from the current (0.05 to 0.1 A) set by the duty of the frequency set by the oscillator

up to the limit of the allowable operating range, IOH = 2.8 A

Function Table

Phase switching clock edge timing

2 phase excitation

1-2 phase excitation

W1-2 phase excitation

2W1-2 phase excitation

Rising edge only

1-2 phase excitation

W1-2 phase excitation

2W1-2 phase excitation 4W1-2 phase excitation

Rising and falling edges

Forward

Reverse

CWB

ENABLE

Motor current is cut off when low

RESET

Active low

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