STK672-640C-E View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

STK672-640C-E

2-phase Stepping Motor Driver

ON Semiconductor 

Precautions

STK672-640C-E

[GND wiring]

• To reduce noise on the 5V system, be sure to place the GND of C01 in the circuit given above as close as possible to

Pin 2 and Pin 6 of the hybrid IC. Also, to achieve accurate current settings, be sure to connect Vref GND to the point

where P.G1 and P.G2 share a connection.

[Input pins]

• If VDD is being applied, use care that each input pin does not apply a negative voltage less than -0.3V to PG and DO

not apply a voltage greater than or equal to VDD voltage.

• Do not wire by connecting the circuit pattern on the P.C.B side to N.C Pins. shown in the internal block diagram.

• Apply 2.5V high level input to pins 10, 12, 13, 14, 15, and 17.

• Since the input pins do not have built-in pull-up resistors, when the open-collector type pins 10, 12, 13, 14, 15, and 17

are used as inputs, a 1 to 20kΩ pull-up resistor (to VDD) must be used.

At this time, use a device for the open collector driver that has output current specifications that pull the voltage down

to less than 0.8V at Low level (less than 0.8V at Low level when IOL=5mA).

[Current setting Vref]

If the motor current is temporarily reduced, the circuit given below (STK672-640C-E : IOH>0.3A) is recommended.

5V

R01

Vref

R3

R02

5V

R01

Vref

R3

R02

• Motor current peak value IOH setting

IOH

0

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=0.089Ω when using the STK672-640C-E

No. A2116-6/27

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