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ADS1255 读取数据 较实际值偏高

Other Parts Discussed in Thread: ADS1255

ADS1255  读取的数据值比实际输入的电压值偏高。  四位半万用表测量电压值是2.2001V,adc后读取的值换算电压后却是2.7V 。 VREF =2.498V。 测量电压范围是0-5V。  请教一下各位高手。