晶振知识 多多学习。。。慢慢积累
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<P style="TEXT-JUSTIFY: distribute-all-lines; TEXT-ALIGN: justify; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">晶片进料检查</SPAN><SPAN style="mso-bidi-font-size: 10.5pt" lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P></DIV></TD></TR></TBODY></TABLE></v:textbox></v:rect><v:rect style="POSITION: absolute; WIDTH: 1620px; HEIGHT: 468px; TOP: 2712px; LEFT: 6660px" id=_x0000_s1028><v:textbox style="mso-next-textbox: #_x0000_s1028">
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<P style="TEXT-JUSTIFY: distribute-all-lines; TEXT-ALIGN: justify; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">硬化</SPAN><SPAN style="mso-bidi-font-size: 10.5pt" lang=EN-US><o:p></o:p></SPAN></P></DIV></TD></TR></TBODY></TABLE></v:textbox></v:rect><v:rect style="POSITION: absolute; WIDTH: 1620px; HEIGHT: 468px; TOP: 6651px; LEFT: 6660px" id=_x0000_s1032><v:textbox style="mso-next-textbox: #_x0000_s1032">
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<P style="TEXT-JUSTIFY: distribute-all-lines; TEXT-ALIGN: justify; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">熔接</SPAN><SPAN style="mso-bidi-font-size: 10.5pt" lang=EN-US><o:p></o:p></SPAN></P></DIV></TD></TR></TBODY></TABLE></v:textbox></v:rect><v:rect style="POSITION: absolute; WIDTH: 1620px; HEIGHT: 468px; TOP: 9785px; LEFT: 6698px" id=_x0000_s1042><v:textbox style="mso-next-textbox: #_x0000_s1042">
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<P style="TEXT-JUSTIFY: distribute-all-lines; TEXT-ALIGN: justify; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">检漏</SPAN><SPAN style="mso-bidi-font-size: 10.5pt" lang=EN-US><o:p></o:p></SPAN></P></DIV></TD></TR></TBODY></TABLE></v:textbox></v:rect><v:rect style="POSITION: absolute; WIDTH: 1620px; HEIGHT: 468px; TOP: 10835px; LEFT: 6660px" id=_x0000_s1043><v:textbox style="mso-next-textbox: #_x0000_s1043">
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<P style="TEXT-JUSTIFY: distribute-all-lines; TEXT-ALIGN: justify; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">老化</SPAN><SPAN style="mso-bidi-font-size: 10.5pt" lang=EN-US><o:p></o:p></SPAN></P></DIV></TD></TR></TBODY></TABLE></v:textbox></v:rect><v:shape style="POSITION: absolute; WIDTH: 360px; HEIGHT: 468px; TOP: 9279px; LEFT: 7361px" id=_x0000_s1044 type="#_x0000_t67"><v:textbox style="LAYOUT-FLOW: vertical-ideographic"><FONT size=3></FONT></v:textbox></v:shape><v:shape style="POSITION: absolute; WIDTH: 360px; HEIGHT: 468px; TOP: 10329px; LEFT: 7361px" id=_x0000_s1045 type="#_x0000_t67"><v:textbox style="LAYOUT-FLOW: vertical-ideographic"><FONT size=3></FONT></v:textbox></v:shape><v:shape style="POSITION: absolute; WIDTH: 360px; HEIGHT: 468px; TOP: 11341px; LEFT: 7342px" id=_x0000_s1046 type="#_x0000_t67"><v:textbox style="LAYOUT-FLOW: vertical-ideographic"><FONT size=3></FONT></v:textbox></v:shape><v:rect style="POSITION: absolute; WIDTH: 1620px; HEIGHT: 468px; TOP: 11855px; LEFT: 6660px" id=_x0000_s1047><v:textbox style="mso-next-textbox: #_x0000_s1047">
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<P style="TEXT-JUSTIFY: distribute-all-lines; TEXT-ALIGN: justify; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">全检</SPAN><SPAN style="mso-bidi-font-size: 10.5pt" lang=EN-US><o:p></o:p></SPAN></P>
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<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">包装</SPAN><SPAN style="mso-bidi-font-size: 10.5pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-JUSTIFY: distribute-all-lines; TEXT-ALIGN: justify; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="mso-bidi-font-size: 10.5pt" lang=EN-US><o:p><FONT face="Times New Roman"> </FONT></o:p></SPAN></P></DIV></TD></TR></TBODY></TABLE></v:textbox></v:rect><v:shape style="POSITION: absolute; WIDTH: 360px; HEIGHT: 468px; TOP: 14445px; LEFT: 7380px" id=_x0000_s1051 type="#_x0000_t67"><v:textbox style="LAYOUT-FLOW: vertical-ideographic"><FONT size=3 face="Times New Roman"></FONT></v:textbox></v:shape><v:rect style="POSITION: absolute; WIDTH: 1620px; HEIGHT: 468px; TOP: 13895px; LEFT: 6683px" id=_x0000_s1052><v:textbox style="mso-next-textbox: #_x0000_s1052">
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<P style="TEXT-JUSTIFY: distribute-all-lines; TEXT-ALIGN: justify; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">外观检查</SPAN><SPAN style="mso-bidi-font-size: 10.5pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman"> </FONT></o:p></SPAN></P></DIV></TD></TR></TBODY></TABLE></v:textbox></v:rect><v:shape style="POSITION: absolute; WIDTH: 360px; HEIGHT: 468px; TOP: 13434px; LEFT: 7394px" id=_x0000_s1053 type="#_x0000_t67"><v:textbox style="LAYOUT-FLOW: vertical-ideographic"><FONT size=3 face="Times New Roman"></FONT></v:textbox></v:shape></v:group><SPAN lang=EN-US><o:p><FONT face="Times New Roman"> </FONT></o:p></SPAN><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 16pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">晶振作用：</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-SIZE: 16pt" lang=EN-US><o:p></o:p></SPAN></B></P><PRE style="LINE-HEIGHT: 23pt; mso-line-height-rule: exactly"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">给单片机正常工作提供稳定的时钟信号。原理：在石英晶体的两个极板上加一个电场，晶片会产生机械变形，对极板施加机械力使其变形，又会在极板上产生相应的电荷，这叫压电效应。如果在两个极板上加上交变的电压，晶片便会产生机械变形震荡，同时这种机械震荡还会产生交变的电场（比较的微小），但是当外加交变的电压的频率与晶片固有的频率（由其形状和尺寸决定）相等时，机械振动的幅度会加剧，产生交变电场也增大。叫做压电谐波。即使去掉晶振，电路照样的能振荡，并且如果把那两个电容改成可调电容的话也能得到想要的某个频率，那还要晶振干什么：晶振、陶瓷谐振槽路、</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><FONT face=Arial>RC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">振荡器以及硅振荡器是适用于微控制器的四种时钟源。针对具体应用优化时钟源设计依赖于以下因素：成本、精度和环境参数。</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><FONT face=Arial>RC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">振荡器能够快速启动，成本也比较低，但通常在整个温度和工作电源电压范围内精度较差，会在标称输出频率的</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><FONT face=Arial>5%</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">至</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><FONT face=Arial>50%</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">范围内变化；但相对</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><FONT face=Arial>RC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">振荡器而言，基于晶振与陶瓷谐振槽路的振荡器通常能提供非常高的初始精度和较低的温度系数。</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><o:p></o:p></SPAN></PRE>
<P style="LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 15pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振基本参数简介：</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 15pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></B></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; TEXT-INDENT: 28pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-char-indent-count: 2.0" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>1.<B style="mso-bidi-font-weight: normal">CL</B>:</SPAN><SPAN style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang=EN-US> </SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">指与晶体元件一起决定负载谐振频率（</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>FL</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">）的有效外接电容，</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>CL</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">是一个测试条件也是一个使用条件，这个值可在用户具体使用时根据情况作适当调整，来微调</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>FL</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">的实际工作频率（也即晶体的制造公差可调整）。但它有一个合适值，否则会给振荡电路带来恶化，其值通常采用</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>6pF</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">、</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>10pF</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">、</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>15pF </SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">、</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>20pF</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">、</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>30pF</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">、</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">∝</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">等，其中当</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>CL</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">标为</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">∝</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">时表示其应用在串联谐振型电路中，不要再加负载电容，并且工作频率就是晶体的（串联）谐振频率</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>Fr</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">。用户应当注意，对于某些晶体（包括不封装的振子应用），在某一生产规范既定的负载电容下（特别是小负载电容时），</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>±0.5pF</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">的电路实际电容的偏差就能产生</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>±10×10-6</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">的频率误差。因此，负载电容是一个非常重要的订货规范指标。</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-char-indent-count: 1.5" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>2.</SPAN><SPAN style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang=EN-US> </SPAN><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>F0</SPAN></B><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">：指晶体元件规范中所指定的频率，也即用户在电路设计和元件选购时所希望的理想工作频率；</SPAN><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>Fr</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">：</SPAN></B><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">指在规定条件下，晶体元件电气阻抗为电阻性的两个频率中较低的一个频率；</SPAN><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>FL</SPAN></B><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">：指在规定条件下，晶体元件与一负载电容串联或并联，其组合阻抗呈现为电阻性时两个频率中的一个频率。</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 12pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 12pt; mso-font-kerning: 0pt" lang=EN-US>3.</SPAN><SPAN style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang=EN-US> </SPAN><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>Rr</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">：</SPAN></B><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">指晶体元件在谐振频率处的等效电阻</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 16.5pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang=EN-US><o:p> </o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 16.5pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang=EN-US><o:p> </o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 16.5pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang=EN-US><o:p> </o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 16.5pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 15pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">如何判断晶振是否起振</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 16pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">：</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 16pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></B></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; TEXT-INDENT: -18pt; MARGIN: 0cm 0cm 0pt 18pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: list 18.0pt left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-list: l1 level1 lfo1" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-fareast-font-family: Arial; mso-font-kerning: 0pt" lang=EN-US><SPAN style="mso-list: Ignore">1.<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">示波器检测。这个会用示波器的就应该都知道了</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>…….</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">就不详说了。（之前也有碰到说示波器检测不真，但单体晶振测试就起振的。这样的情况是可能晶振电阻比较大，或者是晶振负载与两端的电容值不匹配。）</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; TEXT-INDENT: -18pt; MARGIN: 0cm 0cm 0pt 18pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: list 18.0pt left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-list: l1 level1 lfo1" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-fareast-font-family: Arial; mso-font-kerning: 0pt" lang=EN-US><SPAN style="mso-list: Ignore">2.<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">万用表检测。可以使用万用表检测晶振两端的电压是否是芯片工作电压的一半。如果是一半那就表示起振了。另外用镊子碰晶振的另一只脚，电压有明显变化也表示晶振是起振的。</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-line-height-rule: exactly" class=MsoNormal><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 16pt; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">晶振电路中两端的电阻电容的作用：<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></B></P>
<P style="LINE-HEIGHT: 23pt; TEXT-INDENT: -28pt; MARGIN: 0cm 0cm 0pt 30.2pt; mso-line-height-rule: exactly; mso-char-indent-count: -2.0; mso-para-margin-left: .21gd" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">并联电阻的四大作用：</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><BR><FONT face="Times New Roman">1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、配合</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><FONT face="Times New Roman">IC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">内部电路组成负反馈、移相，使放大器工作在线性区；</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><BR><FONT face="Times New Roman">2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、限流防止谐振器被过驱；</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><FONT face="Times New Roman"> <BR>3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、并联降低谐振阻抗，使谐振器易启动；</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><BR></SPAN><SPAN style="FONT-SIZE: 15pt" lang=EN-US><FONT face="Times New Roman">4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 15pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、电阻取值影响波形的脉宽。</SPAN><SPAN style="FONT-SIZE: 15pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-line-height-rule: exactly" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">两端电容的作用：</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="LINE-HEIGHT: 23pt; TEXT-INDENT: 28pt; MARGIN: 0cm 0cm 0pt; mso-line-height-rule: exactly; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这个是晶体的匹配电容，只有在外部所接电容为匹配电容的情况下，振荡频率才能保证在标称频率附近的误差范围内。最好按照所提供的数据来，如果没有，一般是</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><FONT face="Times New Roman">30pF</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">左右。太小了不容易起振。在某些情况下，也可以通过调整这两个电容的大小来微调振荡频率，当然可调范围一般在</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><FONT face="Times New Roman">10ppm</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">量级。</SPAN><SPAN style="FONT-SIZE: 14pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 16pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">常见晶振异常：</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-SIZE: 16pt" lang=EN-US><o:p></o:p></SPAN></B></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; TEXT-INDENT: -18pt; MARGIN: 0cm 0cm 0pt 18pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: list 18.0pt left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-list: l0 level1 lfo2" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-fareast-font-family: Arial; mso-font-kerning: 0pt" lang=EN-US><SPAN style="mso-list: Ignore">1.<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振时振时不振</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>------a:</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振负载与两端电容不匹配造成频率偏差太大；</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>b:</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振本身有问题，寄生</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>&</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">阻抗值波动大</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>&</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">内部焊点不牢等。</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; TEXT-INDENT: -18pt; MARGIN: 0cm 0cm 0pt 18pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: list 18.0pt left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-list: l0 level1 lfo2" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-fareast-font-family: Arial; mso-font-kerning: 0pt" lang=EN-US><SPAN style="mso-list: Ignore">2.<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振装板上不行，用电热风催一下或者拆下来重新装上去又可以了</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>------</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">主要是晶振负载与两端电容不匹配造成频率偏差太大。电热风催实际是相当于改变了线路的杂散电容。</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; TEXT-INDENT: -18pt; MARGIN: 0cm 0cm 0pt 18pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: list 18.0pt left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-list: l0 level1 lfo2" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-fareast-font-family: Arial; mso-font-kerning: 0pt" lang=EN-US><SPAN style="mso-list: Ignore">3.<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振负载与晶振两端的电容的匹配</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>-------<o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; TEXT-INDENT: 112pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-char-indent-count: 8.0" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>CL=(C1*C2)/(C1+C2)+C”<SPAN style="mso-spacerun: yes"> </SPAN><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-char-indent-count: 1.5" class=MsoNormal align=left><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">其中</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>CL:</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振的负载电容值；</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US> C<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue="1" UnitName="C">1 C</st1:chmetcnv>2</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">：晶振两端的电容值；</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>C”</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">：线路杂散电容</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-char-indent-count: 1.5" class=MsoNormal align=left><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振的匹配电容的主要作用是匹配晶振和振荡电路，使电路易于启振并处于合理的激励态下，对频率也有一定的“微调”作用。对</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt" lang=EN-US>MCU</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">，正确选择晶振的匹配电容，关键是微调晶体的激励状态，避免过激励或欠激励，前者使晶体容易老化影响使用寿命并导致振荡电路</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt" lang=EN-US>EMC</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">特性变劣，而后者则不易启振，工作亦不稳定，所以正确地选择晶体匹配电容是很重要的</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt" lang=EN-US><o:p> </o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>4.32768HZ</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振出现时间偏差：时间存在偏差主要是频率有偏差，</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>1PPM</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">的频率偏差换算成天时间误差就是</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>0.0864S</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">。那么如果需要时间误差要做到准确就最好晶振两端的电容要按正常配比焊接，同时要晶振供应商帮忙通过</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>QWA</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">检测找最好的</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>0</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">误差</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>PPM</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">值，按</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>0</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">误差的标准来指定供货的频率范围。</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>5,32768HZ</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振的的焊接：</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">）</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>.</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">碰到有将</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>32768HZ</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振的外壳焊在板上来实现信号屏蔽防干扰。这样的结果会导致因焊接时间太长将晶振内部的焊点融化，内部结构晶片倾斜碰壳而短路。最好的方法是</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>PCB</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">板上设有两个针孔使用铜线捆绑晶振。或者使用橡胶粘结剂进行。</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>2).</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振弯脚时随意弯曲。最佳的弯曲是用手指捏住圆柱晶体的外壳</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>;</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">用镊子夹住离晶体基座底部</SPAN><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="3" UnitName="mm"><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>3mm</SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">以上的引线处，用镊子夹住弯曲引线成</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>90</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">°，不要用力拉引线。用力拉引线可能造成引线根部的玻璃子破裂，而产生漏气导致电气性能损坏。如果漏气了晶振也就基本上是不能用了。</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>6.</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">因为焊接时有阻焊剂等脏污就选择使用超声波清洗</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>PCBA</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">板：经超声波清洗或超声波焊接会影响和损坏石英晶体的内部结构甚至晶片破损。</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>7.</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">晶振起振时间长，开机不振关机再开机就起振，耗电量大成品电池不耐用：</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">这主要是晶振的电阻太大造成的，低电压下晶振就无法起振了。</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p> </o:p></SPAN></P>
<P style="TEXT-ALIGN: left; LINE-HEIGHT: 23pt; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-line-height-rule: exactly; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>------------待</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-font-kerning: 0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">续</SPAN><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US><o:p></o:p></SPAN></P></DIV>
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