Smartphone camera module shape memory alloy drive control integrated circuit

Abstract

The invention discloses a smart phone camera module shape memory alloy drive control integrated circuit solution, which mainly solves the technical problems of traditional voice coil motors, such as complicated process, difficult miniaturization, short stroke and poor drop resistance of micro electric motors. The drive control chip of the present invention includes: logic controller U1, digital-to-analog converter U2, analog-to-digital converter U3, front-end amplifier U4, power manager U9, oscillator U7, front-end drift eliminator U8, current source U10, I 2 C communication interface; the input terminal of U1 is connected to U3, the output terminal of U1 is connected to U2, the output terminal of U2 is connected to U10, the input terminal of U3 is directly connected to the output terminal of U4, U8 is connected to the negative pole of the operational amplifier input, U10 is connected to the positive pole of the operational amplifier input, and the operational amplifier The output terminal is connected to U4, U10 is connected to one end of the memory alloy, the other end of the memory alloy is connected to U9, U5, U7 and the integrated circuit chip are connected to the outside world using I 2 C communication interface. The invention realizes high-precision high-current driving of the shape memory alloy, real-time monitoring of the impedance change of the shape memory alloy, and accurate feedback of lens position information to assist in realizing optical focusing and optical anti-shake 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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