📄 ds1621高精度温度测量模拟.htm
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<DIV style="PADDING-TOP: 4px">发表于 2006-12-8 13:28 <A
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<DIV class="right smalltxt">2006-12-8
13:28</DIV></DIV><BR>整体的原理图包括128*64LCD的驱动，ADC0831和DS1621,并使用I2C
DEBUGGER监听I2C总线<BR>在datasheet中提供了一种高精度测量的公式:<BR>T=TR-0.25+(count_remain+count_per_C)/count_per_c<BR><BR><IMG
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<DIV class="right smalltxt">2006-12-8
13:28</DIV></DIV><BR>但是在使用过程中，我发现了一些问题<BR>就是公式的应用
上<BR>按照公式计算出来的数值要比实际给定的温度值 大0.5<BR>成线形偏差
所以在原公式基础上改为<BR>T=TR-0.25+(ount_per_c+count_remain)/count_per_c-0.5即<BR>T=TR-0.75+(ount_per_c+count_remain)/count_per_c<BR>得到结果只有在温度值在-0.03——-0.01之间存在错码<BR>温度值在0.01——0.03之间有0.01的下差<BR><BR>[<I>
本帖最后由 jjj 于 2006-12-8 13:32 编辑 </I>]</DIV><BR
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