Research On Design And Test Of Intelligent Distributed Controller Key Modules For Automotive Electronics

With the rapid development of modern society,the future automotive electronic technology usher in unprecedented opportunities,especially with the rapid development of intelligent driving technology,people have higher and higher requirements of comfortable driving experience,which requires automotive semiconductor chips with high performance,high integration and high reliability.Therefore,it is very important to study the functional design and test verification of various kinds of vehicle semiconductor chips and ensure the safe and reliable application,which has become one of the important areas of competition in the industry.Among them,Intelligent Distributed Controller(IDC)chip is the core part of intelligent control of the vehicle body and plays an important role in safe and comfortable driving applications.In this thesis,the key modules of IDC chip are designed,tested and analyzed.Based on the research status of automotive electronics chip at home and abroad,through the analysis of the circuit design and test data of IDC chip key module,this thesis focuses on the measure accuracy problem of the temperature detection module;the output accuracy problem of Analog to Digital Convertor(ADC)module;and the overvoltage protection function failure in the regulator module.A two-channel measurement method is proposed to improve the stability of temperature measurement;Real time to digital calibration design is adopted to improve the output accuracy of ADC;the control circuit of the overvoltage protection module is optimized and designed to control the temperature drift.Finally,the stability and reliability of IDC chip are improved.The main innovation works of this thesis include:1.In this thesis,a two-channel compensation test scheme is proposed to realize the measurement method of high precision and small voltage module.In the practical application,this method can observably improve the fitting degree of the measurement results of junction temperature and the temperature detection module,improve the monitoring accuracy of automotive electronic terminal customers on the inside and outside environment temperature.2.A real-time digital calibration algorithm is proposed to calibrate the nonlinear error caused by amplifier limited gain and capacitance mismatch with the cyclic ADC.This method satisfies the high precision output characteristic of ADC in IDC chip,with smaller area and lower power consumption.The results show that the signal-to-noise distortion ratio is increased from 64 dB to 85 dB under the condition of 0.3% capacitance mismatch.3.The overvoltage protection function of traditional voltage regulator always have parameter drift failure which due to different temperature environment.In this thesis,the method of optimizing and designing the feedback comparison circuit is presented,and the reverse threshold voltage of the overvoltage protection circuit is fine tuned to suppress the parameter drift which caused by temperature change.Base on the simulation result and the production lot's verification measurements,the proposed scheme can improve the yield rate of the overvoltage protection parameters by an average of 2.03%.