The Cambridge Mechatronics CM824 device is a high performance, low cost, and low power controller chip for driving SMA actuators for use in smartphone cameras and other high precision actuator applications.
When used in smartphone cameras, CM824 can be configured for single or multiple SMA actuators in auto-focus (AF) and optical image stabilisation (OIS) applications having up to 8 SMA actuation wires. CM824 has been designed using a rich patent portfolio of IC and firmware features resulting in ultimate SMA actuator system performance, resulting in faster focussing and better image quality under camera shake conditions.
The CM824 chip controls a wide range of SMA actuator configurations for closed loop OIS and AF including CML’s 8W (All-in-one OIS and AF) , Module Tilt and other alternative single and dual actuator configurations:
The handset processor communicates with CM824 over an industry standard I2C bus whilst the internal CPU operates servo loops and algorithms for the AF position and OIS motion processing functions. CM824 can also be used in Split Architecture arrangements where the OIS motion processing function resides on another device. CM824 also includes onboard EEPROM storage for image sensor calibration data.
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