STK672-110 데이터 시트보기 (PDF) - SANYO -> Panasonic

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STK672-110

Two-Phase Stepping Motor Driver (Square Wave Drive) Output Current: 1.8 A

SANYO -> Panasonic 

Sample Application Circuit

STK672-110

Two-phase stepping motor

At least 100 µF

• To minimize noise in the 5-V system, locate the ground side of capacitor CO2 in the above circuit as close as possible

to pin 1 of the IC.

• Insert resistor RO3 (47 to 100 Ω) so that the discharge energy from capacitor CO4 is not directly applied to the CMOS IC

in this hybrid device. If the diode D1 has Vf characteristics with Vf less than or equal to 0.6 V (when If = 0.1 A), this will

be smaller than the CMOS IC input pin diode Vf. If this is the case RO3 may be replaced with a short without problem.

• Standard or HC type input levels are used for the pin 7, 8, and 9 inputs.

• If open-collector type circuits are used for the pin 7, 8, and 9 inputs, these circuit will be in the high-impedance state

for high level inputs. As a result, chopping circuit noise may cause the input circuits to operate incorrectly. To prevent

incorrect operation due to such noise, capacitors with values between 470 and 1000 pF must be connected between pins

7 and 11, 8 and 11, and 9 and 11. (A capacitor with a value between 470 and 1000 pF must be connected between pins

6 and 11 as well if an open-collector output IC is used for the RESETB pin (pin 6) input.)

• Taking the input bias current (IIB) characteristics into account, the resistor RO1 must not exceed 100 kΩ.

• The following circuit (for a lowered current of over 0.2 A) is recommended if the application needs to temporarily

lower the motor current. Here, a value of close to 100 kΩ must be used for resistor RO1 to make the transistor output

saturation voltage as low as possible.

Input Pin Functions (CMOS input levels)

Pin

Pin No.

Function

Input conditions when operating

CLOCK

9 Reference clock for motor phase current switching

Operates on the rising edge of the signal

MODE

8 Excitation mode selection

Low: 2-phase excitation

High: 1-2 phase excitation

CWB

7 Motor direction switching

Low: CW (forward)

High: CCW (reverse)

RESETB

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

6

Applications must apply a reset signal for at least 20 µs when power is first applied. A reset is applied by a low level

• A simple reset function is formed from D1, CO4, and RO3 in this application circuit. With the CLOCK input held low,

when the 5-V supply voltage is brought up a reset is applied if the motor output phases A and BB are driven. If the 5-V

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

of the capacitor CO4 and check circuit operation again.

• See the timing chart for the concrete details on circuit operation.

No. 6041-4/9

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