带有存储器功能的数字温度计－ds1624技术应用.htm

数字温度计和存储器ds1624以及其驱动程序代码

<P>＋0℃</P></TD>
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<P>0000，0000，0000，0000</P></TD>
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<P>0000H</P></TD></TR>
<TR>
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<P>-0.5℃</P></TD>
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<P>1111，1111，1000，0000</P></TD>
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<P>FF80H</P></TD></TR>
<TR>
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<P>-25.0625℃</P></TD>
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<P>1110，0110，1111，0000</P></TD>
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<P>E6F0H</P></TD></TR>
<TR>
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<P>-55℃</P></TD>
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<P>1100，1001，0000，0000</P></TD>
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<P>C900H</P></TD></TR></TBODY></TABLE>
<P style="TEXT-INDENT: 21pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt">由于数据在总线上传输时MSB在前，所以DS1624读出的数据可以是一个字节(分辨率为1℃)，也可以是两个字节，第二个字节包含的最低位为0.03125℃。 
<P>表2是13位温度寄存器中存储温度值的数据格式 
<P style="TEXT-INDENT: 40pt; mso-char-indent-count: 4.0; mso-char-indent-size: 10.0pt"><IMG height=14 src="upload/2006_07/0607081512130912.gif" width=147 v:shapes="_x0000_s1034"> <IMG height=14 src="upload/2006_07/0607081512130911.gif" width=51 v:shapes="_x0000_s1033"> <IMG height=14 src="upload/2006_07/060708151213098.gif" width=87 v:shapes="_x0000_s1032"> <IMG height=14 src="upload/2006_07/060708151213099.gif" width=75 v:shapes="_x0000_s1031"> <IMG height=24 src="upload/2006_07/060708151213092.gif" width=3 v:shapes="_x0000_s1030"> <IMG height=24 src="upload/2006_07/060708151213094.gif" width=3 v:shapes="_x0000_s1029"> <IMG height=24 src="upload/2006_07/060708151213093.gif" width=3 v:shapes="_x0000_s1028"> <IMG height=24 src="upload/2006_07/060708151213096.gif" width=3 v:shapes="_x0000_s1027">高八位字节　　　　　　　　　　　　　　　　　　　低八位字节 
<TABLE style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt" cellSpacing=0 cellPadding=0 border=1>
<TBODY>
<TR>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid" vAlign=top width=33>
<P>S</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B14</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B13</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B12</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B11</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B10</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B9</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B8</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>　</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B7</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B6</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B5</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B4</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>B3</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>0</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>0</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 25.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=33>
<P>0</P></TD></TR></TBODY></TABLE>
<P>　　　　　　　　　表3　温度值的数据存储格式 
<P>其中 S－为符号位，当S＝0时，表示当前的测量的温度为正的温度；当S＝1时，表示当前的测量的温度为负的温度。B14－B3为当前测量的温度值。最低三位被设置为0。 
<P>DS1624工作方式 
<P style="TEXT-INDENT: 21pt">DS1621的工作方式是由片上的配置/状态寄存器来决定的，如表4，该寄存器的定义如下： 
<P style="TEXT-INDENT: 21pt">　　　　　　　　表4　配置/状态寄存器格式 
<TABLE style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt" cellSpacing=0 cellPadding=0 border=1>
<TBODY>
<TR>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 53.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid" vAlign=top width=71>
<P>DONE</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 53.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=71>
<P>1</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 53.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=71>
<P>0</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 53.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=71>
<P>0</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 53.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=71>
<P>1</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 53.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=71>
<P>0</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 53.3pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=71>
<P>1</P></TD>
<TD style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 53.3pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=71>
<P>1SHOT</P></TD></TR></TBODY></TABLE>
<P>其中DONE为转换完成位，温度转换结束时置1，正在进行转换时为0；1SHOT为温度转换模式选择。1SHOT为1时为单次转换模式，DS1624在收到启动温度转换命令EEH后进行一次温度转换。1SHOT为0时为连续转换模式，此时DS1624将连续进行温度转换，并将最近一次的结果保存在温度寄存器中。该位为非易失性的。 
<P>片内256字节存储器操作 
<P style="TEXT-INDENT: 21pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt">控制器对DS1624的存储器编程有两种模式：一种是字节编程模式，另一种是页编程模式。 
<P style="TEXT-INDENT: 21pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt">在字节编程模式中，主控制器发送地址和一个字节的数据到DS1624。 
<P style="TEXT-INDENT: 21pt">在主器件发出开始（START）信号以后，主器件发送写控制字节即1001A2A1A00（其中R/W控制位为低电平“0”）。指示从接收器被寻址，DS1624接收后应答，再由主器件发送访问存储器指令（17H）后，DS1624接收后应答，接着由主器件发送的下一个字节字地址将被写入到DS1624的地址指针。主器件接收到来自DS1624的另一个确认信号以后，发送数据字节，并写入到寻址的存储地址。DS1624再次发出确认信号，同时主器件产生停止条件STOP，启动内部写周期。在内部写周期DS1624将不产生确认信号。 
<P style="TEXT-INDENT: 21pt">在页编程模式中，如同字节写方式，先将控制字节、访问存储器指令（17H）、字地址发送到DS1624，接着发N个数据字节，其中以8个字节为一个页面。主器件发送不多于一个页面字节的数据字节到DS1624，这些数据字节暂存在片内页面缓存器中，在主器件发送停止信号以后写入到存储器。接收每一个字节以后，低位顺序地址指针在内部加1。高位顺序字地址保持为常数。如果主器件在产生停止条件以前要发送多于一页字的数据，地址计数器将会循环，并且先接收到的数据将被覆盖。像字节写操作一样，一旦停止条件被接收到，则内部写周期将开始。 
<P style="MARGIN-LEFT: 21pt">存储器的读操作 
<P>　　在这种模式下，主器件可以从DS1624的EEPROM中读取数据。主器件在发送开始信号之后，主器件首先发送写控制字节1001A2A1A00，主器件接收到DS1624应答之后，发送访问存储器的指令（17H），收到DS1624的应答之后，接着发送字地址将被被写入到DS1624的地址指针。这时DS1624发送应答信号之后，主器件并没有发送停止信号，而是重新发送START开始信号，接着又发送读控制字节1001A2A1A01，主器件接收到DS1624应答之后，开始接收DS1624送出来的数据，主器件每接收完一个字节的数据之后，都要发送一个应答信号给DS1624，直到主器件发送一个非应答信号或停止条件来结束DS1624的数据发送过程。 
<P>DS1624的指令集