Msp430 Microcontroller-based Portable Holter Monitor Developed

Cardiovascular disease is one of main diseases that threat human health, and the early diagnosis and treatment are effective ways that prevent heart disease. ECG monitor is playing the very important role in among. Base on the dynamic ECG monitor basic function and feature, this paper has designed a portable dynamic ECG monitor based on MSP430F149 microcontroller.In the hardware part, taking a dual 8-channel multiplexers MAX397 as the foundation, the author has designed the heart leads selecting circuit could switch among the three standard-leads, three augmented-leads, one chest-lead and 1mV calibration circuit; Using instrumentation amplifier AD620, the author has designed preamplifier circuit and driven-rignt-leg circuit; Behind them, using operational amplifier, the author has designed a 0.05-100Hz band-pass filter circuit, 50Hz notch filter circuit and main amplifier circuit; finally the author has taken MSP430F149 microcontroller as the digital circuit core, and it takes charge for the control and communication of its peripheral circuit; Using LCD controller S1D13700 and LCD G320240E with resolution 320*240, the author has realized dynamic real-time display of ECG signal and direct-viewing menu setting interface, and working with the 6-key keyboard, the manipulation is simple; The author has used 2GB SD card to record real-time data continuously, and the data recording time could reach 1 month; Using USB interface controller CH372, the system could transmit the date in storage device to upper computer conveniently. In the software part, using structuring program design method, the author has completed the initialization of various modules in the digital circuit part and made them work normally, and the author has optimized the algorithm of LCD module display, and got the good effect.After making printed circuit board and debugging, the software and hardware has realized the anticipated function, and the system is stable and well-performing, and satisfies the request of portable ECG monitor system.The overall system is small, light and convenient to carry, and is suitable to use in families.