The main control circuit of this system is shown in Figure 2, which is mainly composed of MSP430F449 chip, JTAG interface circuit, clock generation circuit, clock output circuit, reset circuit, PWM wave output circuit, power supply circuit, etc. Among them, JTAG is used to download and debug programs, and the PWM wave output circuit is used to control the air pump. When measuring blood pressure, first inflate to 200mmHg high, and then slowly deflate at a rate of about 5mmHg per second. Realize automatic blood pressure measurement.
Figure 2 Electronic sphygmomanometer main control circuit
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