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(huì)產(chǎn)生兩個(gè)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(gè)點(diǎn)需要隔離.
單相防竊電智能電表設(shè)計(jì)兼容直流的電流互感器一直用于檢測(cè)智能電表中的交流電流,但它有一些缺點(diǎn)而且很昂貴.對(duì)于某些應(yīng)用,分流電阻是更好的電流傳感器選擇,因?yàn)樗鼉r(jià)格低廉、具有高線性度并且抗磁場(chǎng)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(yīng)用中,采用隔離電源技術(shù)的數(shù)字隔離器與分流電阻結(jié)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(cè)量相位電流,并利用一個(gè)簡(jiǎn)單的分壓器測(cè)量相位電壓,從而計(jì)算電能并監(jiān)控負(fù)載的質(zhì)量.在這種應(yīng)用中,電力線相位電壓用作AFE的接地參考.零線電流測(cè)量必須隔離,從而保護(hù)AFE免受高壓影響.AFE利用標(biāo)準(zhǔn)SPI或I2C通信將計(jì)算得到的電氣量傳輸給微控制器(MCU).然后,MCU將數(shù)據(jù)發(fā)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(huán)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(zhǎng)x寬x高
型號(hào)
石英晶振頻率
負(fù)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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