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”).
Features
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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.
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)
