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STK672-610 Scheda tecnica(PDF) 6 Page - ON Semiconductor

Il numero della parte STK672-610
Spiegazioni elettronici  2-phase Stepping Motor Driver
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STK672-610
No. A0756-6/19
• Motor current peak value IOH setting
• When R02 is open
IOH= [Vref×1k/1k+3.9k)] ÷Rs= (Vref÷4.9) ÷Rs
The values 1k and 3.9k represent internal driver resistance values, while Rs represents the internal driver current
detection resistance.
Vref= (4.9k
÷ (4.9k+R01)) ×5V (or 3.3V) =IOH×4.9×Rs
The value 4.9k represents the series resistance value of the internal driver values of 1k and 3.9k.
• If R02 is connected
IOH= [Vref×1k/ (1k+3.9k)] ÷Rs= (Vref÷4.9) ÷Rs
The values 1k and 3.9k represent the internal driver resistance values, while Rs represents the internal driver current
detection resistance.
Vref= (R0x
÷ (R01+R0x)) ×5V (or 3.3V) =IOH×4.9×Rs
= [(4.9k
×R02) ÷ ((4.9k×R02) +R01× (4.9k+R02))] ×5V(or 3.3V)
R0x= (4.9k
×R02) ÷ (4.9k+R02)
Rs represents the current detection resistance inside the HIC, while the value 4.9k in the formula above represents the
internal resistance value of the Vref pin.
Rs=0.141
Ω when using the STK672-600
Rs=0.089
Ω when using the STK672-610
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
Low: 2-phase excitation
High: 1-2 phase excitation
MODE2
17
Excitation mode selection
High: Rising edge
Low: Rising and falling edge
CWB
13
Motor direction switching
Low: CW (forward)
High: CCW (reverse)
RESETB
14
System reset and A, AB, B, and BB outputs cutoff.
Applications must apply a reset signal for at least 10
μs when
VDD is first applied.
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.
(1) A simple reset function is formed from D1, CO4, RO3, and RO4 in this application circuit. With the CLOCK input
held low, when the 5V supply voltage is brought up a reset is applied if the motor output phases A and BB are
driven. If the 5V supply voltage rise time is slow (over 50ms), the motor output phases A and BB may not be driven.
Increase the value of the capacitor CO2 and check circuit operation again.
(2) See the timing chart for the concrete details on circuit operation.
5V
R01
R02
R3
5V
R01
R02
R3
Vref
Vref
IOH
0


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