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LV8740V Datasheet(PDF) 10 Page - Sanyo Semicon Device |
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LV8740V Datasheet(HTML) 10 Page - Sanyo Semicon Device |
10 / 23 page LV8740V No.A1864-10/23 Input Pin Function (1) Chip enable function This IC is switched between standby and operating mode by setting the ST pin. In standby mode, the IC is set to power-save mode and all logic is reset. In addition, the internal regulator circuit and charge pump circuit do not operate in standby mode. ST Mode Internal regulator Charge pump Low or Open Standby mode Standby Standby High Operating mode Operating Operating (2) Drive mode switching pin function The IC drive mode is switched by setting the DM pin. In STM mode, stepping motor channel 1 can be controlled by the CLK-IN input. In DCM mode, DC motor channel 2 or stepping motor channel 1 can be controlled by parallel input. Stepping motor control using parallel input is 2-phase or 1-2 phase full torque. DM Drive mode Application Low or Open STM mode Stepping motor channel 1 (CLK-IN) High DCM mode DC motor channel 2 or stepping motor channel 1 (parallel) STM mode (DM = Low or Open) (1) STEP pin function The excitation step progresses by inputting the step signal to the STP pin. Input ST STP Operating mode Low * Standby mode High Excitation step proceeds High Excitation step is kept (2) Excitation mode setting function The excitation mode of the stepping motor can be set as follows by setting the MD1 pin and the MD2 pin. Initial position MD1 MD2 Excitation mode Channel 1 Channel 2 Low Low 2 phase excitation 100% -100% High Low 1-2 phase excitation (full torque) 100% 0% Low High 1-2 phase excitation 100% 0% High High W1-2 phase excitation 100% 0% This is the initial position of each excitation mode in the initial state after power-on and when the counter is reset. (3) Positional detection monitor function Positional detection monitor MONI pin is an open drain output. When the excitation position is an initial position, the MONI output becomes ON. Please refer to (example of current wave type in each excitation mode). (4)Constant-current control reference voltage setting function This IC does the PWM fixed current chopping control of the current of the motor by the automatic operation in setting the output current. The output current in which a fixed current is controlled by the following calculation type is set by the resistance connected between the voltage and RF-GND being input to the VREF pin. IOUT=(VREF/5)/RF resistance *The above-mentioned, set value is an output current of each excitation mode at 100% time. VREF input voltage attenuation function ATT1 ATT2 Current setting reference voltage attenuation ratio Low Low 100% High Low 66.7% Low High 50% High High 33.3% |
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