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见ADS1251 datasheet第九页对于启动时序的要求：Power-Up Sequence： Prior to power-up, all digital and analog input pins must be LOW. At the time of power-up, these signal inputs can be biased to a voltage other than 0V; however, they should never exceed +VDD. Once the ADS1251 powers up, the DOUT/DRDY line will pulse LOW on the first conversion for which the data is valid from the analog input signal.
