智能電表單相防竊電FA-238V的3225愛普生無源晶振 Q22FA23V0053900
電表電源從電力線獲得但安全隔離柵會產生兩個電源域.PS1與相電源是同一電源域,可以直接使用而無需隔離AFE.然而,安全隔離柵1或2則需要使用隔離電源PS2來為MCU和通信模塊隔離1提供電源,或者僅為通信模塊隔離2供電.總而言之單相防竊電電表中有多個點需要隔離.
單相防竊電智能電表設計兼容直流的電流互感器一直用于檢測智能電表中的交流電流,但它有一些缺點而且很昂貴.對于某些應用,分流電阻是更好的電流傳感器選擇,因為它價格低廉、具有高線性度并且抗磁場干擾.遺憾的是分流電阻不具有電流互感器所固有的電氣隔離特性.在要求隔離的智能電表等應用中,采用隔離電源技術的數字隔離器與分流電阻結合可提供一種良好的解決方案.
愛普生無源晶振Q22FA23V0053900,智能電表FA-238V的3225晶振
考慮單相防竊電智能電表模擬前端(AFE)IC利用分流電阻測量相位電流,并利用一個簡單的分壓器測量相位電壓,從而計算電能并監控負載的質量.在這種應用中,電力線相位電壓用作AFE的接地參考.零線電流測量必須隔離,從而保護AFE免受高壓影響.AFE利用標準SPI或I2C通信將計算得到的電氣量傳輸給微控制器(MCU).然后,MCU將數據發送到通信模塊,通常使用UART接口,必須確保安全隔離并避免接地環路.因此MCU必須與AFE隔離,與通信模塊共地隔離1,或者與通信模塊隔離,與AFE共地隔離2愛普生無源晶振Q22FA23V0053900,智能電表FA-238V的3225晶振
愛普生晶振編碼
長x寬x高
型號
石英晶振頻率
負載
頻率25°C
頻率公差
工作溫度范圍
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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