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ADS1248读出的AD值转换

Other Parts Discussed in Thread: ADS1248

感测器使用PT100。ADS1248读出的3byte AD值先将之显示为DEC格式,例如170,24,230,170为最先收到的第一笔资料,其正负号的判断为?

请问如何将此AD值转为阻值再去查PT100温度表得到温度?或是该如何转成电压值,转成电压后又如何变成电阻值?


烦请赐教 谢谢