【应用】常开开关MDCG-4-Q2016-4用于智能家居门磁传感器，器件一致性好
LITTELFUSE的常开开关MDCG-4最大切换电压和电流分别为200Vdc和0.5A，可供选择的灵敏度范围为12-38AT，密封开关触点不受外界环境影响，也不会影响外界环境，触点的闭合不需要工作电流，非常适合用于切换微控制逻辑电平负载。本文主要讲MDCG-4-Q2016-4在智能家居门磁传感器上的应用。
MDCG-4-Q2016-4 ，灵敏度最大为22AT，最大切换电压和电流分别为200Vdc、0.5A，尺寸大小为15.24mm x 2.28mm，如图1所示；工作温度范围-40°C~+125°C。配合磁铁使用，靠磁铁吸合。当Reed Switch 闭合时，接触电阻小于0.1Ω；当Reed switch打开时，最低有10000MΩ的高绝缘电阻。
图1 Reed Switch 尺寸
该产品使用一节3V CR123A电池供电，为了节省功耗，采用3.3MΩ的电阻进行上拉，常态时Reed Switch 处于闭合状态，平均电流约为0.9uA。在布防状态，MCU当检测到Reed Switch打开时，会通过ZigBee将报警信号传到报警中心，门磁传感器设计框图如图2所示，原理图设计如图3所示：
图2 门磁传感器设计框图
图3 Reed Switch 原理图设计
PCB设计时，将Reed Switch 靠近PCB板边放置，由于PCB板到结构壳体有一定的间隙，结构壳体有一定的厚度，因此磁铁的选型需要把这个间隙和厚度考虑进去。PCB设计如图4所示。
图4 Reed Switch PCB 设计
考虑客户的安装方式不同，需要对金属板和木板两种安装方式对门磁传感器进行X/Y/Z方向的make/break距离进行测试，如图5所示。经过测试5个样品，产品一致性良好，金属板和木板测试结果均满足产品设计需求。
图5 门磁传感器方向测试示意图
MDCG-4-Q2016-4已过ETL标准，且大量供货，是经过市场验证的优质产品，性能不受腐蚀影响，器件一致性较好，可靠性高，是磁簧继电器、安保、计量、限位传感、电信和办公设备应用的理想之选。
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