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STK672-120-E データシート(PDF) 5 Page - Sanyo Semicon Device

部品番号 STK672-120-E
部品情報  Thick-Film Hybrid IC Unipolar Fixed-Current Chopper (Self-Excited PWM) Scheme and Built-in Phase Signal Distribution IC Two-Phase Stepping Motor Driver (Square Wave Drive) Output Current 2.4A
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メーカー  SANYO [Sanyo Semicon Device]
ホームページ  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

STK672-120-E データシート(HTML) 5 Page - Sanyo Semicon Device

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STK672-120-E
No.6042-5/9
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
6
System reset and A, AB, B, and BB outputs cutoff.
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 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 CO4 and check circuit operation again.
• See the timing chart for the concrete details on circuit operation.
Usage Notes
• 5V system input pins
[RESETB and CLOCK (Input signal timing when power is first applied)]
As shown in the timing chart, a RESETB signal input is required by the driver to operate with the timing in which the
F1 gate is turned on first. The RESETB signal timing must be set up to have a width of at least 20
μs, as shown below.
The capacitor CO4 and the resistor RO3 in the application circuit form simple reset circuit that uses the RC time
constant rising time. However, when designing the RESETB input based on CMOS levels, the application must have
the timing shown in figure 1.
Figure 1 RESETB and CLOCK Signals Input Timing
See the timing chart for details on the CLOCK, MODE, CWB, and other input pins.
[Vref <Motor current peak value setting>]
In the sample application circuit, the peak value of the motor current (IOH) is set by RO1, RO2, and VDD (5V) as
described by the formula below.
Figure 2 Motor Current IO Flowing into the Driver IC
IOH = Vref ÷ Rs Here, Rs is hybrid IC internal current detection resistor
Vref = (R02
÷ (R01 + R02)) × 5V
STK672-120-E: Rs = 0.165
Ω
At least 20
μs
At least 10
μs
Rise of the 5V supply voltage
RESETB signal input
CLOCK signal
IOH
0


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