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ON Semi designs auto focus driver for small camera modules

18 Jul 2014

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ON Semiconductor has unveiled an all-in-one type auto-focus driver that integrates current driver, control logic, Hall-sensor, and EEPROM, designed for small camera modules.

The LC898214XC features digital loop filter and provides fast, accurate auto focus convergence with temperature compensation, while consuming minimal power. The integrated constant current driver provides lower electro interference noise than competing solutions. In addition, the space-saving design enables thinner and lighter smartphones.

"There is a strong and growing demand for improved smartphone camera features – specifically for fast, accurate, power-friendly auto-focus," said Ikuya Kawasaki, GM of the Intelligent Power Solution division at ON Semi. "We developed this highly integrated, all-in-one auto focus controller for the specific demands of smartphone applications."

The closed auto focus system provides for more accurate auto focus control, while also lowering power consumption compared with open loop systems. The loop filter coefficients are adjustable via an I2C interface, allowing the device to be programmed for optimal convergence time when paired with various different actuators. All these features support a closed auto focus system, and can provide higher auto focus performance from one integrated circuit.

The driver is housed in a lead-free, Halide-free WLCSP-8 package and is priced at $0.88 in 4,000-unit quantities.

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LC898214XC block diagram. Source: ON Semi

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