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电路架构：msp430G2553+ADS1248（内部参考源、内部晶振、激励电流1.5mA、PT100三线制接法）
430与ADS1248采用虚拟spi通信
我遇到过，时序不够严格，低温影响数字器件的响应了，需要严格按照手册上时序间隔采样
