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HDC1080: 温度和湿度显示异常

Part Number: HDC1080

1、关闭了加热模式;PCB特意此特定区域隔开,

2、刚开机,10秒左右,读取的数值相对准确

3、工作30秒之后,相对于真实值(30.5℃,85%),温度会上升约3摄氏度,湿度下降10~15%,检测的值为(33.5℃,73%),检测错误也稳定

4、将芯片加一个小风扇,吹;采集数据正常。

5、请问这个现象是什么原因导致?