An ic detection circuit for mobile phone touch screen drive

Abstract

The invention discloses an IC (Integrated Circuit) detecting circuit for driving a touch screen of a mobile phone. The circuit comprises a central processing unit (CPU), a constant current module, a constant voltage module and a switching module, wherein the CPU is used for sending out a first switching signal, a second switching signal and a current control signal; the constant current module is used for generating constant current corresponding to the current control signal based on the current control signal; the constant voltage module is used for generating low ripple voltage based on the first switching signal and the constant current; and the switching module is used for outputting the low ripple voltage to external detection equipment based on the second switching signal. By adopting a closed-loop control mode in the technical solution, five kinds of low ripples required by an IC are realized, and continuous and variable driving voltage of 1mV precision can be realized; and by adopting the solution, the 1uA consumed current and the change of the IC can be detected, and the problem about compatibility between continuous and variable voltage and low ripple output can be solved.

Description

technical field [0001] The invention relates to a detection circuit, in particular to an IC detection circuit for driving a touch screen of a mobile phone. Background technique [0002] The touch screen driver IC is responsible for processing the touch screen signal of the mobile phone inside the mobile phone, and is the first bridge for man-machine exchange. The superior performance of the IC directly affects the sensitivity of the mobile phone touch screen and the user experience, so the detection of the IC is very important in the mobile phone manufacturing process. The detection of this IC requires a little external voltage to pass the test before entering the next process and assembling it on the flexible circuit board. [0003] The existing mobile phone touch screen has the characteristics of high sensitivity, high precision and high reliability. These characteristics are inseparable from its high-performance control IC, which also puts forward extremely high require...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an IC detection circuit for mobile phone touch screen drive to solve the problems of low output voltage accuracy, inaccurate timing control and high detection cost in the prior art

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