Описание продукта
LC898201 is the appropriate motor control LSI for the surveillance camera usage, and it can drive iris, focus, zoom and Day/Night switching simultaneously. It incorporates two feedback circuits for iris and focus control, and two stepper motor control circuits for zoom and Day/Night switching. Moreover, the feedback control applies iris control, and stepper motor controls apply focus, zoom and Day/Night switching at the mode selection. Stepper motor control circuits can drive the stepping motor efficiently(It is called “ECO(GREEN)-driver”).
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Отличительные черты |
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Built-in equalizer circuit by digital operation
- Iris control equalizer circuit - Focus control equalizer circuit (MR sensor can be connected.) - Coefficients can be set arbitrarily through the SPI interface. - Computed values in the equalizer can be monitored.
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Built-in 3ch stepping motor control circuits (2ch are equipped with “ECO(GREEN)-driver” circuits)
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PI control circuit
- 30mA Sink output terminal - Built-in PI detecting function (A/D method)
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A/D converter
- 12bit (6ch) : Iris, Focus, ECO, PI detection
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D/A converter
- 8bit (5ch) : Hall offset, Constant current bias, MR Sensor offset, ECO offset
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Operation Amplifier
- 4ch (ECO x1, Iris control x1, Focus control x2)
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PWM pulse generator
- PWM Pulse generator for feedback control (Up to 12bit accuracy) - PWM pulse generator for stepper motor control (Up to 1024 micro steps) - PWM pulse generator for general-purpose H-Bridge (128 voltage levels)
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Motor Driver
- ch1 to ch6 : Io max=200mA - ch7 : Io max=300mA - Built-in thermal protection circuit - Built-in low-voltage malfunction prevention circuit
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Power supply voltage
- Logic unit : 2.7V to 3.6V (IO, Internal core) - Driver unit : 2.7V to 5.5V (Motor drive)
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