Focus controller is able to lower power budget

22 July 2014

ON Semiconductor has introduced the integrated  LC898214XC auto focus controller for camera modules in smartphones.

It features digital loop filter and is claimed to provide 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, says the company.

It integrates all functions for the closed auto focus driver, including digital logic as a closed auto focus control, Hall device as a positioning sensor, EEPROM for the storage of filter parameters and compensation data, and a constant current driver as an actuator driver.  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 co-efficients are adjustable via an I²C interface, allowing the device to be programmed for optimal convergence time when paired with various different actuators. These integrated features support a closed auto focus system, and can provide higher auto focus performance from one IC.

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