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STK672-640AN-E Arkusz danych(PDF) 7 Page - ON Semiconductor |
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STK672-640AN-E Arkusz danych(HTML) 7 Page - ON Semiconductor |
7 / 28 page STK672-640AN-E No.A2276-7/28 [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. |
Podobny numer części - STK672-640AN-E |
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Podobny opis - STK672-640AN-E |
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