📄 ds18b20shuziwenduji.htm
字号:
auto;line-height:150%'><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>地信号</span></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;line-height:150%'><span lang=EN-US>2</span></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;line-height:150%'><span lang=EN-US>DQ</span></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;line-height:150%'><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>数据输入</span><span lang=EN-US>/</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>输出引脚。开漏单总线接口引脚。当被用着在寄生电源下，也可以向器件提供电源。</span></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;line-height:150%'><span lang=EN-US>3</span></p>
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height:20.55pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;line-height:150%'><span lang=EN-US>VDD</span></p>
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<td width=477 valign=top style='width:357.7pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
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mso-border-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt;
height:20.55pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;line-height:150%'><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>可选择的</span><span lang=EN-US>VDD</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>引脚。当工作于寄生电源时，此引脚必须接地。</span></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:39.0pt;text-indent:-39.0pt;tab-stops:list 39.0pt left 54.0pt;
word-break:break-all'><b style='mso-bidi-font-weight:normal'><i
style='mso-bidi-font-style:normal'><span lang=EN-US style='font-family:幼圆'>3</span></i></b><b
style='mso-bidi-font-weight:normal'><i style='mso-bidi-font-style:normal'><span
style='font-family:幼圆'>．</span></i></b><b style='mso-bidi-font-weight:normal'><i
style='mso-bidi-font-style:normal'><span lang=EN-US style='font-size:7.0pt;
font-family:"Times New Roman";mso-fareast-font-family:幼圆'>
</span></i></b><b style='mso-bidi-font-weight:normal'><i style='mso-bidi-font-style:
normal'><span lang=EN-US style='font-family:幼圆'>DS18B20</span></i></b><b
style='mso-bidi-font-weight:normal'><i style='mso-bidi-font-style:normal'><span
style='font-family:幼圆'>的使用方法<u1:P> </u1:P></span></i></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
text-indent:21.0pt;tab-stops:54.0pt;word-break:break-all'><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>由于</span><span
lang=EN-US>DS18B20</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>采用的是</span><span lang=EN-US>1</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>－</span><span
lang=EN-US>Wire</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>总线协议方式，即在一根数据线实现数据的双向传输，而对</span><span
lang=EN-US>AT89S51</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>单片机来说，硬件上并不支持单总线协议，因此，我们必须采用软件的方法来模拟单总线的协议时序来完成对</span><span
lang=EN-US>DS18B20</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>芯片的访问。</span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
text-indent:21.0pt;tab-stops:54.0pt;word-break:break-all'><span
style='mso-bidi-font-size:10.5pt;font-family:幼圆'>由于<span lang=EN-US>DS18B20</span>是在一根<span
lang=EN-US>I/O</span>线上读写数据，因此，对读写的数据位有着严格的时序要求。<span lang=EN-US>DS18B20</span>有严格的通信协议来保证各位数据传输的正确性和完整性。该协议定义了几种信号的时序：初始化时序、读时序、写时序。所有时序都是将主机作为主设备，单总线器件作为从设备。而每一次命令和数据的传输都是从主机主动启动写时序开始，如果要求单总线器件回送数据，在进行写命令后，主机需启动读时序完成数据接收。数据和命令的传输都是低位在先。</span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
text-indent:21.0pt;tab-stops:54.0pt;word-break:break-all'><span lang=EN-US
style='mso-bidi-font-size:10.5pt;font-family:幼圆'>DS18B20</span><span
style='mso-bidi-font-size:10.5pt;font-family:幼圆'>的复位时序<u1:P> </u1:P></span><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
tab-stops:54.0pt;word-break:break-all'><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><u2:SHAPE id="_x0000_i1025" style="WIDTH: 408pt; HEIGHT: 106.5pt" type="#_x0000_t75"><u2:IMAGEDATA u3:title="A16" src="file:///C:/DOCUME~1/sxj1/LOCALS~1/Temp/msoclip1/01/clip_image003.png"></u2:IMAGEDATA></u2:SHAPE><img
border=0 width=544 height=142 id="_x0000_i1034"
src="http://www.runmcu.com/Article/UploadFiles/200509/20050902113347280.gif"
u6:shapes="_x0000_i1025"></span><span lang=EN-US><u1:P></u1:P></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
word-break:break-all'><span lang=EN-US>DS18B20</span><span style='mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>的读时序</span><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
text-indent:24.0pt;mso-char-indent-count:2.0;tab-stops:54.0pt;word-break:
break-all;mso-char-indent-size:10.5pt'><span style='mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>对于</span><span
lang=EN-US>DS18B20</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>的读时序分为读</span><span lang=EN-US>0</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>时序和读</span><span
lang=EN-US>1</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>时序两个过程。</span><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
text-indent:24.0pt;mso-char-indent-count:2.0;tab-stops:54.0pt;word-break:
break-all;mso-char-indent-size:10.5pt'><span style='mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>对于</span><span
lang=EN-US>DS18B20</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>的读时隙是从主机把单总线拉低之后，在</span><span
lang=EN-US>15</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>秒之内就得释放单总线，以让</span><span
lang=EN-US>DS18B20</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>把数据传输到单总线上。</span><span lang=EN-US>DS18B20</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>在完成一个读时序过程，至少需要</span><span
lang=EN-US>60us</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>才能完成。</span><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
tab-stops:54.0pt;word-break:break-all'><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><u2:SHAPE id="_x0000_i1026" style="WIDTH: 408pt; HEIGHT: 114pt" type="#_x0000_t75"><u2:IMAGEDATA u3:title="A17" src="file:///C:/DOCUME~1/sxj1/LOCALS~1/Temp/msoclip1/01/clip_image005.png"><img
border=0 width=544 height=152 id="_x0000_i1035"
src="http://www.runmcu.com/Article/UploadFiles/200509/20050902113347583.gif"
u6:shapes="_x0000_i1026"></span><span lang=EN-US></u2:IMAGEDATA></u2:SHAPE><u1:P></u1:P></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
tab-stops:54.0pt;word-break:break-all'><span lang=EN-US>DS18B20</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>的写时序</span><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
text-indent:24.0pt;mso-char-indent-count:2.0;tab-stops:54.0pt;word-break:
break-all;mso-char-indent-size:10.5pt'><span style='mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>对于</span><span
lang=EN-US>DS18B20</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>的写时序仍然分为写</span><span lang=EN-US>0</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>时序和写</span><span
lang=EN-US>1</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>时序两个过程。</span><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
text-indent:24.0pt;mso-char-indent-count:2.0;tab-stops:54.0pt;word-break:
break-all;mso-char-indent-size:10.5pt'><span style='mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>对于</span><span
lang=EN-US>DS18B20</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>写</span><span lang=EN-US>0</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>时序和写</span><span
lang=EN-US>1</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>时序的要求不同，当要写</span><span lang=EN-US>0</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>时序时，单总线要被拉低至少</span><span
lang=EN-US>60us</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>，保证</span><span lang=EN-US>DS18B20</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>能够在</span><span
lang=EN-US>15us</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>到</span><span lang=EN-US>45us</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>之间能够正确地采样</span><span
lang=EN-US>IO</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>总线上的“</span><span lang=EN-US>0</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>”电平，当要写</span><span
lang=EN-US>1</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>时序时，单总线被拉低之后，在</span><span
lang=EN-US>15us</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>之内就得释放单总线。</span><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
tab-stops:54.0pt;word-break:break-all'><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><u2:SHAPE id="_x0000_i1027" style="WIDTH: 408pt; HEIGHT: 126pt" type="#_x0000_t75"><u2:IMAGEDATA u3:title="A18" src="file:///C:/DOCUME~1/sxj1/LOCALS~1/Temp/msoclip1/01/clip_image007.png"><img
border=0 width=544 height=168 id="_x0000_i1036"
src="http://www.runmcu.com/Article/UploadFiles/200509/20050902113347482.gif"
u6:shapes="_x0000_i1027"></span><span lang=EN-US></u2:IMAGEDATA></u2:SHAPE><u1:P></u1:P></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
tab-stops:54.0pt;word-break:break-all'><span lang=EN-US style='mso-bidi-font-size:
10.5pt'> <u1:P> </u1:P></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:39.0pt;text-indent:-39.0pt;tab-stops:list 39.0pt left 54.0pt;
word-break:break-all'><b style='mso-bidi-font-weight:normal'><i
style='mso-bidi-font-style:normal'><span lang=EN-US style='font-family:幼圆'>4</span></i></b><b
style='mso-bidi-font-weight:normal'><i style='mso-bidi-font-style:normal'><span
style='font-family:幼圆'>．</span></i></b><b style='mso-bidi-font-weight:normal'><i
style='mso-bidi-font-style:normal'><span lang=EN-US style='font-size:7.0pt;
font-family:"Times New Roman";mso-fareast-font-family:幼圆'>
</span></i></b><b style='mso-bidi-font-weight:normal'><i style='mso-bidi-font-style:
normal'><span style='font-family:幼圆'>实验任务<u1:P> </span></i></b><span
lang=EN-US></u1:P></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
text-indent:21.0pt;tab-stops:54.0pt;word-break:break-all'><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>用一片</span><span
lang=EN-US>DS18B20</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>构成测温系统，测量的温度精度达到</span><span
lang=EN-US>0.1</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>度，测量的温度的范围在－</span><span lang=EN-US>20</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>度到＋</span><span
lang=EN-US>100</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>度之间，用</span><span lang=EN-US>8</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>位数码管显示出来。</span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:36.0pt;text-indent:-36.0pt;tab-stops:list 36.0pt left 54.0pt;
word-break:break-all'><b style='mso-bidi-font-weight:normal'><i
style='mso-bidi-font-style:normal'><span lang=EN-US style='mso-fareast-font-family:
幼圆'>5</span></i></b><b style='mso-bidi-font-weight:normal'><i
style='mso-bidi-font-style:normal'><span style='font-family:幼圆;mso-ascii-font-family:
宋体'>．</span></i></b><b style='mso-bidi-font-weight:normal'><i
style='mso-bidi-font-style:normal'><span lang=EN-US style='font-size:7.0pt;
font-family:"Times New Roman";mso-fareast-font-family:幼圆'>
</span></i></b><b style='mso-bidi-font-weight:normal'><i style='mso-bidi-font-style:
normal'><span style='font-family:幼圆'>电路原理图<u1:P> </span></i></b><span
lang=EN-US></u1:P><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
tab-stops:54.0pt;word-break:break-all'><span lang=EN-US><u2:SHAPE id="_x0000_i1028" style="WIDTH: 408pt; HEIGHT: 423pt" type="#_x0000_t75"><u2:IMAGEDATA u3:title="A19" src="cc435.30.gif"><img
border=0 width=544 height=564 id="_x0000_i1037"
src="http://www.runmcu.com/Article/UploadFiles/200509/20050902113348557.gif"
u6:shapes="_x0000_i1028"></span></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
tab-stops:54.0pt;word-break:break-all'><span lang=EN-US> <u1:P> </u1:P></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:36.0pt;text-indent:-36.0pt;tab-stops:list 36.0pt left 54.0pt;
word-break:break-all'><b style='mso-bidi-font-weight:normal'><i
style='mso-bidi-font-style:normal'><span lang=EN-US style='mso-fareast-font-family:
幼圆'>6</span></i></b><b style='mso-bidi-font-weight:normal'><i
style='mso-bidi-font-style:normal'><span style='font-family:幼圆;mso-ascii-font-family:
宋体'>．</span></i></b><b style='mso-bidi-font-weight:normal'><i
style='mso-bidi-font-style:normal'><span lang=EN-US style='font-size:7.0pt;
font-family:"Times New Roman";mso-fareast-font-family:幼圆'>
</span></i></b><b style='mso-bidi-font-weight:normal'><i style='mso-bidi-font-style:
normal'><span style='font-family:幼圆'>系统板上硬件连线<u1:P> </span></i></b><span
lang=EN-US></u1:P></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:70.3pt;text-indent:-49.3pt;tab-stops:list 0cm left 54.0pt;
word-break:break-all'><span style='mso-bidi-font-size:10.5pt;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:"Times New Roman";
mso-bidi-font-family:宋体'>1</span><span style='mso-bidi-font-size:10.5pt;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>）．</span><span
lang=EN-US style='font-size:7.0pt;font-family:"Times New Roman"'>
</span><span style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>把“单片机系统”区域中的</span><span lang=EN-US>P0.0</span><span
style='mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>－</span><span
lang=EN-US>P0.7</span><span style='mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>用</span><span lang=EN-US>8</span><span
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