【选型】可用于PLC、HVAC等产品中的模拟电压输出温度传感器,灵敏度为-8.2Mv/℃
在一些产品中,MCU本身自带AD功能,那么可以考虑一下ROHM的BD1020HFV-TR,这是一款模拟电压输出的温度传感器。通过一个AD口即可采集数据得到温度,相比IIC接口的数字温度传感器,可为MCU节省1根口线,同时省去了通讯协议部分,在应用上更为简单。在PLC、HVAC等产品中需要简单、准确、可靠的温度解决方案,可通过此传感器来简化电路,从而增加设计的可靠性。
如下图所示的基本应用电路,BD1020HFV-TR的输出连接到MCU的AD口,在3V供电的情况下,-40℃~+100℃所对应的温度输出电压范围大约为1.9V~0.75V,且成线性,在程序中就省去了查表,根据AD值用一元一次方程即可计算出对应的温度数据。
BD1020HFV-TR典型的灵敏度为-8.2mV/℃,工作温度范围为:-30℃到100℃。在30℃时最大误差±1.5℃,全工作温度范围的最大误差为±2.5℃。在功耗方面,3V供电时的典型消耗电流为仅为4μA。采用的HVSOF5小封装,尺寸为1.6mm*1.6mm,高度为0.6mm,仅占用极少PCB面积。
图1.封装尺寸
推荐理由如下:
1、模拟电压输出,MCU通过一个AD口采样即可,减少IO口占用;
2、宽工作温度范围:-30℃到100℃;
3、低耗电:3V供电时消耗电流典型值为4μA;
4、尺寸小:HVSOF5小封装,尺寸为1.6mm*1.6mm,高度为0.6mm,占用PCB面积小。
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现货: 5
现货市场
服务
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