Intelligent mobile phone shooting module shape memory alloy driving control integrated circuit

Abstract

The invention discloses an intelligent mobile phone shooting module shape memory alloy driving control integrated circuit, and mainly solves the technical problems that the process of a conventional voice coil motor is complex, the miniaturization is difficult, the stroke of a micro-electric motor is short, and the falling resistance is poor. A driving control chip comprises a logic controller U1, a digital-to-analog converter U2, an analog-to-digital converter U3, a front end amplifier U4, a power supply manager U9, an oscillator U7, a front end drift eliminator U8, a current source U10 and an I2C communication interface. An input end of U1 is connected with U3. An output end of U1 is connected with U2. An output end of U2 is connected with U10. An input end of U3 is directly connected to an output end of U4. U8 is connected with an input cathode of an operational amplifier. U10 is connected with an input anode of the operational amplifier. An output end of the operational amplifier is connected with U4. U10 is connected with one end of a memory alloy, and the other end of the memory alloy is connected with U9. The loop of U10 is further connected with U5. U7 and an integrated circuit chip are connected with the external parts respectively through the I2C communication interface. According to the invention, high-precision large-current driving of the shape memory alloy is realized, the impedance change of the shape memory alloy is monitored in real time, and lens position information is accurately fed back so as to realize optical focusing and optical anti-vibration functions.

Description

technical field [0001] The present invention relates to the design field of an integrated circuit (Integrated Circuit) for driving and controlling shape memory alloys to perform prescribed actions, and in particular to a driving control integrated circuit for shape memory alloys applied to optical focusing and anti-shake technologies of smartphone camera modules. Background technique [0002] Smartphones are the fastest growing consumer electronics product and will continue this growth trend for some time. From the user's point of view, they hope that the picture quality of mobile phones can be comparable to that of digital cameras; however, the high-definition technology of digital cameras has not been transferred to smartphones immediately. The main reasons for this are technical constraints and user expectations. The product definitions of the two are different. The main function of a digital camera is the camera function, that is, "high-quality photos"; while the main f...

AI Technical Summary

Problems solved by technology

It mainly solves the technical problems of complex process and difficult miniaturization of traditional voice coil motors and the technical problems of short travel and poor drop resistance of micro electric motors

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