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,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
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
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
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