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

Part Name

Description

Manufacturer

STK672-640C-E

2-phase Stepping Motor Driver

ON Semiconductor 

STK672-640C-E

<FAULT1, FAULT2 output>

FAULT1 Output

FAULT1 is an open drain output. Low is output if either overcurrent or overheating is detected.

FAULT2 output

Output is resistance divided (3 levels) and the type of abnormality detected is converted to the corresponding output

voltage.

• Opened motor pin: 10mV (typ)

• Overcurrent: 2.5V (typ)

• Overheat: 3.3V (typ)

Abnormality detection can be released by a RESETB operation or turning VDD voltage on/off.

<VrefOP output pin configuration>

180kΩ

Output pin

Pin 7

5V

1.3V

17kΩ

-

1kΩ

+

To opened motor pin

detection circuit

VSS

<VrefOP output>

To set the motor current detection circuit operates when pin is open, to monitor the reference voltage VrefOP

terminal. It is also possible to set any detectable current by connecting an external pull-up resistor to 5V supply.

<IOHd by setting pull-up resistor current sensing pin 7 open>

When 7 pins open, VrefOP (typ) is 98mV. In this case, detection current IOHd is expressed as follows.

VefOP = IOHd × Rs (Rs: Current detection resistor)

Detection current is 1.1A.

Now, detection current greater than 0.25A is IOHdX. Reference voltage VrefOPX is calculated as above.

Pull-up resistor Rdx by pin 7 is calculated as follows.

RdX = (180 × RTX) ÷ (180 - RTX)

RTX = (5.0V - VrefOPX) ÷ ((1.0588 × VrefOPX) - 0.0765) (RdX and RTX unit is kΩ)

*To disable pin open detection, please connect a 5V pull-up resistor of 10k to 15kΩ.

No. A2116-14/27

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