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STK672-120-E データシート(PDF) 5 Page - Sanyo Semicon Device |
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STK672-120-E データシート(HTML) 5 Page - Sanyo Semicon Device |
5 / 9 page 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 |
同様の部品番号 - STK672-120-E |
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同様の説明 - STK672-120-E |
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