智能电表单相防窃电FA-238V的3225爱♂普生无源晶振 Q22FA23V0053900

电表电源从电力线获得但安全隔离栅会产生两个电源域.PS1与相电源↘是同一电源域ㄨ,可以直接使用而无需隔离AFE.然而,安全隔离栅1或2则需要「使用隔离电源PS2来为MCU和通信模块隔离1提供电源,或者仅为通信々模块隔离2供电.总而言之单相防窃电电表中有多个点需要隔离.

单相防窃电智能电表↑设计兼容直流的电流互感器一直用于检测智能电表中的交流电流,但它有一◢些缺点而且很昂贵.对于某些应用,分流电阻是更好的电流传感器选择,因为』它价格低廉、具有高线性度并且抗磁场干扰.遗憾的是分流电阻ㄨ不具有电流互感器所固有的电≡气隔离特性.在要求隔离的智能电表等应用中,采用隔离电源技术的数字隔↘离器与分流电阻结合可提供一种良好∏的解决方案.

爱普『生无源晶振Q22FA23V0053900,智能电表FA-238V的3225晶振

爱普生晶振编㊣　码	长x宽x高	型号	石英晶振频率	负载	频率25°C	频率公差	工作温度范围	ESR最大
Q22FA23V0050500	3.2x2.5x0.7mm	FA-238V	12.288000MHz	8pF	+/-20ppm	+/-20ppm	-20to+70°C	≤100Ω
Q22FA23V0051300	3.2x2.5x0.7mm	FA-238V	15.980000MHz	8pF	+/-15ppm	+/-15ppm	-20to+70°C	≤80Ω
Q22FA23V0051900	3.2x2.5x0.7mm	FA-238V	12.000000MHz	22pF	+/-20ppm	+/-20ppm	-30to+85°C	≤100Ω
Q22FA23V0052100	3.2x2.5x0.7mm	FA-238V	12.000000MHz	20pF	+/-20ppm	+/-30ppm	-20to+70°C	≤100Ω
Q22FA23V0052700	3.2x2.5x0.7mm	FA-238V	12.288000MHz	9pF	+/-20ppm	+/-20ppm	-20to+70°C	≤100Ω
Q22FA23V0052900	3.2x2.5x0.7mm	FA-238V	12.000000MHz	12pF	+/-20ppm	+/-20ppm	-40to+85°C	≤100Ω
Q22FA23V0053300	3.2x2.5x0.7mm	FA-238V	15.000000MHz	20pF	+/-18ppm	+/-22ppm	-40to+85°C	≤80Ω
Q22FA23V0053400	3.2x2.5x0.7mm	FA-238V	12.000000MHz	20pF	+/-20ppm	+/-30ppm	-40to+85°C	≤100Ω
Q22FA23V0053600	3.2x2.5x0.7mm	FA-238V	13.107200MHz	12.5pF	+/-10ppm	+/-10ppm	-20to+60°C	≤80Ω
Q22FA23V0053900	3.2x2.5x0.7mm	FA-238V	12.800000MHz	12pF	+/-50ppm	+/-30ppm	-20to+70°C	≤100Ω
Q22FA23V0054800	3.2x2.5x0.7mm	FA-238V	12.000000MHz	20pF	+/-25ppm	+/-30ppm	-40to+85°C	≤100Ω
Q22FA23V0055300	3.2x2.5x0.7mm	FA-238V	12.288000MHz	12pF	+/-20ppm	+/-30ppm	-40to+85°C	≤100Ω
Q22FA23V0056400	3.2x2.5x0.7mm	FA-238V	14.318000MHz	10pF	+/-15ppm	+/-30ppm	-20to+70°C	≤80Ω
Q22FA23V0056500	3.2x2.5x0.7mm	FA-238V	14.745600MHz	10pF	+/-15ppm	+/-30ppm	-20to+70°C	≤80Ω
Q22FA23V0056700	3.2x2.5x0.7mm	FA-238V	12.000000MHz	8pF	+/-50ppm	+/-30ppm	-40to+85°C	≤100Ω
Q22FA23V0057200	3.2x2.5x0.7mm	FA-238V	15.750000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C	≤80Ω
Q22FA23V0057300	3.2x2.5x0.7mm	FA-238V	13.507600MHz	18pF	+/-15ppm	+/-30ppm	-20to+70°C	≤80Ω
Q22FA23V0057500	3.2x2.5x0.7mm	FA-238V	12.500000MHz	7pF	+/-15ppm	+/-30ppm	-20to+70°C	≤100Ω
Q22FA23V0057600	3.2x2.5x0.7mm	FA-238V	13.521270MHz	10pF	+/-20ppm	+/-22ppm	-40to+85°C	≤80Ω
Q22FA23V0057700	3.2x2.5x0.7mm	FA-238V	12.288000MHz	12pF	+/-20ppm	+/-23ppm	-40to+85°C	≤100Ω
Q22FA23V0057800	3.2x2.5x0.7mm	FA-238V	13.824000MHz	18pF	+/-10ppm	+/-10ppm	-20to+70°C	≤80Ω
Q22FA23V0058200	3.2x2.5x0.7mm	FA-238V	12.000000MHz	16pF	+/-20ppm	+/-30ppm	-40to+85°C	≤100Ω
Q22FA23V0058300	3.2x2.5x0.7mm	FA-238V	13.824000MHz	9pF	+/-10ppm	+/-30ppm	-20to+70°C	≤80Ω
Q22FA23V0058400	3.2x2.5x0.7mm	FA-238V	12.000000MHz	15pF	+/-30ppm	+/-30ppm	-20to+70°C	≤100Ω
Q22FA23V0058500	3.2x2.5x0.7mm	FA-238V	13.824000MHz	15pF	+/-10ppm	+/-16ppm	-30to+85°C	≤80Ω
Q22FA23V0058600	3.2x2.5x0.7mm	FA-238V	12.000000MHz	15pF	+/-20ppm	+/-20ppm	-20to+70°C	≤100Ω
Q22FA23V0058900	3.2x2.5x0.7mm	FA-238V	15.974400MHz	7pF	+/-50ppm	+/-50ppm	-30to+85°C	≤80Ω

考虑单相防窃电智能电表模】拟前端(AFE)IC利用分流电阻测量相位电流,并利用一个简单的分压器测量相位电压,从而计算电能并监控负载的质量.在这种应用中,电ζ　力线相位电压用作AFE的接地参考.零线电流测量必须隔离,从而保护AFE免□受高压影响.AFE利用标准SPI或I2C通信将计算得到的电气量传输给微控制器(MCU).然后,MCU将数据发送到通信模块,通常使用UART接口,必∮须确保安全隔离并避免接地环路.因此MCU必须与AFE隔离,与通信模块共地隔离1,或者与通信模块隔离,与AFE共地隔离2爱普生无源晶振Q22FA23V0053900,智能电表FA-238V的3225晶振