Application of Mixed-Signal Micro-Controller for Portable and Multi-functional Physiology Instrument Development

• Main Authors: Chen , Jun-Da, 陳俊達
• Other Authors: Hung , Kuo-Yung
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/19888468331182479453

碩士 === 明志科技大學 === 機電工程研究所 === 98 === The purpose of this thesis is to design a multi-functional physiology instrument which combines the Electrocardiography(ECG) detection circuit, blood glucose detection circuit, electrically erasable programmable read-only memory (EEPROM), transmit interface of universal serial bus(USB), interface of SPI for Wireless transmission technologies (UZ 2400), 64 x 128 STN matrix LCD panel and mixed signal processor MSP430FG439 ( Texas Instrument Inc.). The portable physiology instrument possess the function of measured electrocardiogram, heart rate, blood glucose, data storage, wire/wireless data transmission and real-time display. The design of the portable physiology instrument is including hardware circuit and firmware. The part of hardware circuits including: ECG sampling circuit, 60 Hz notch filter circuit, 2 Hz high pass filter, 40 Hz low pass filter, integration of wireless transmission module and micro current detection circuit. Another part of firmware circuits including: heart rate analyze, wireless transmission, real time waveform displayer use matrix LCD panel, and micro current (10~50 uA)/ blood glucose values (40~300 mg/dL) computes. Besides, for resolving the measure accuracy problem of ST-segment, the thesis use inflection point function method to calculate the joint before the QRS waves, R wave, and a J-point at 40ms before the ST-segment. In this thesis, we use a 12bits high resolution A/D Converter and operation amplifier of embedded in MSP430, for reducing noise in A/D converting process. This amplifier not only can be use programming logical control to change the gain of voltage signal(16 V/V max), but also can change operation function, for example like: inverting , non-inverting, voltage follower or voltage compare, we can also ignore the load effects of impedance, make the ratio of signal input to output be similar to 1. If this multi-functional portable physiology instrument could be development successfully, it would be a new technologies platform for medical industry, and also to Improve the concepts of disease prevention.