huangxz 发表于 2013-5-17 14:36 
这么严重么,参考手册上面有没有写准确度啊
上两个图吧，斜率误差在3%，说明书说可能要校准吧
Tousethe on-chiptemperature sensor,the userselectsthe analoginput channelINCHx =1010.Any
otherconfigurationis doneasif anexternalchannelwasselected,including referenceselection,
conversion-memoryselection,etc.
Thetypical temperature sensortransfer function is shownin Figure23-10. Whenusingthe temperature sensor,the sampleperiodmustbegreaterthan 30µs.The temperature sensor offset error can be large,and may need to be calibrated for most applications.See device-specific datasheet for parameters.
Selectingthe temperature sensorautomaticallyturns onthe on-chipreferencegeneratorasavoltage
sourcefor the temperature sensor.However,it doesnotenablethe V
REF+
outputoraffectthe reference
selectionsfor the conversion.Thereferencechoicesfor convertingthe temperature sensorarethe same
aswithanyotherchannel.
我用的是1.5v参考电压，分辨率4095 1号设备AD值 2911 <-> 1066mv <-> 22.5度
2号设备AD值2960 <-> 1084mv <-> 27.6度
采样保持8个时钟，时间为 8/32768s 连续采40次，去掉第一次和最后一次值，再求平均
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