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STK672-640AN-E 데이터시트(PDF) 7 Page - ON Semiconductor

부품명 STK672-640AN-E
상세설명  2-phase Stepper Motor Driver
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

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STK672-640AN-E
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[Setting the motor current]
The motor current, IOH, is set using the Pin 19 voltage, Vref, of the hybrid IC.
Equations related to IOH and Vref are given below.
Vref
 (RO2  (RO2+RO1))VDD(5V) ··········································· (1)
IOH  (Vref  4.9)  Rs ······························································· (2)
The value of 4.9 in Equation (2) above represents the Vref voltage as divided by a circuit inside the control IC.
Rs : 0.089
 (Current detection resistor inside the hybrid IC)
IOH
0
[Smoke Emission Precuations]
If Pin 18 (S.G terminal) is attached to the board without using solder, overcurrent may flow into the MOSFET at VCCON
(24V ON), causing the STK672-640AN-E to emit smoke because 5V circuits cannot be controlled.
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
Initial state of A and BB phase excitation in the timing charts
is set by switching from low to high.
A reset is applied by a low level
ENABLE
15
The A, AB, B, and BB outputs are turned off, and after
operation is restored by returning the ENABLE pin to the
high level, operation continues with the same excitation
timing as before the low-level input.
The A, AB, B, and BB outputs are turned off by a
low-level input.
Output Pin Functions
Pin Name
Pin No.
Function
Input Conditions When Operating
FAULT
16
Monitor pin used when over-current detection or overheat
detection function is activated.
Low level is output when detected.
Note : See the timing chart for the concrete details on circuit operation.


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