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”).

• 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.
• Built-in 3ch stepping motor control circuits (2ch are equipped with “ECO(GREEN)-driver” circuits)
• SPI bus interface
• PI control circuit
• - 30mA Sink output terminal
• - Built-in PI detecting function (A/D method)
• A/D converter
• - 12bit (6ch)
• : Iris, Focus, ECO, PI detection
• D/A converter
• - 8bit (5ch)
• : Hall offset, Constant current bias, MR Sensor offset, ECO offset
• Operation Amplifier
• - 4ch (ECO x1, Iris control x1, Focus control x2)
• 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)
• Motor Driver
• - ch1 to ch6 : Io max=200mA
• - ch7 : Io max=300mA
• - Built-in thermal protection circuit
• - Built-in low-voltage malfunction prevention circuit
• OSC (Type. 48MHz)
• Power supply voltage
• - Logic unit : 2.7V to 3.6V (IO, Internal core)
• - Driver unit : 2.7V to 5.5V (Motor drive)