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<?xml-stylesheet type="text/xsl" href="https://community.arm.com/utility/feedstylesheets/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>LPC900 series A/D</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/21663/lpc900-series-a-d</link><description> 
I notice that the EPM900 is supposed to emulate virtually all of
the LPC9xx devices. Does this include the A/D converter on the
89LPC925? Is there any sample code that uses the A/D converter and
the Real Time Clock? What is the analog input voltage</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: LPC900 series A/D</title><link>https://community.arm.com/thread/75073?ContentTypeID=1</link><pubDate>Fri, 04 May 2007 13:12:17 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:7b2fc05a-1683-4d3e-b54f-d049c023b8e6</guid><dc:creator>Julian Cox</dc:creator><description>&lt;p&gt;&lt;p&gt;
The first reference is for a data logger that records the status
of ports 1 and 2 and has nothing to with the A/D converter.&lt;br /&gt;
The second reference is an application note on using the on-chip
comparators for sigma-delta and dual slope A/D conversion.&lt;br /&gt;
The third reference is to the users manual (not the data sheet) and
has no information about the electrical parameters.&lt;br /&gt;
I doubt the parameters in the data sheet because this sounds more
like &amp;quot;Absolute Limit Values&amp;quot; and maybe the upper one is a mis-print
and should be &amp;quot;Vdd+0.2V&amp;quot;. Since it is unlikely that an on-board A/D
that doesn&amp;#39;t have a negative power supply or an external reference
voltage can process negative voltages, this would mean a dynamic
range of 0.2V. I have my doubts. If you examine the schematic of the
Keil MCB900 board it includes a potentiometer that can feed an analog
voltage of up to 3.3V into the Micro.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC900 series A/D</title><link>https://community.arm.com/thread/50703?ContentTypeID=1</link><pubDate>Fri, 04 May 2007 07:16:48 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:51195dae-ee95-47ac-8765-1af8e576e9f9</guid><dc:creator>Andy Neil</dc:creator><description>&lt;p&gt;&lt;p&gt;
&lt;i&gt;&amp;quot;Is there any sample code that uses the A/D
converter...&amp;quot;&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
How about:&lt;/p&gt;

&lt;p&gt;
&lt;a href="http://www.keil.com/download/docs/207.asp"&gt;http://www.keil.com/download/docs/207.asp&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;
&lt;a href="http://www.nxp.com/acrobat/applicationnotes/AN10187_1.pdf"&gt;www.nxp.com/.../AN10187_1.pdf&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;

&lt;a href="http://www.standardics.nxp.com/support/documents/microcontrollers/pdf/user.manual.p89lpc924.p89lpc925.pdf"&gt;www.standardics.nxp.com/.../user.manual.p89lpc924.p89lpc925.pdf&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;
&lt;i&gt;&amp;quot;The data sheet shows this as Vss-0.2V to Vss+0.2V. Surely this
cannot be right.&amp;quot;&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
Why do you doubt it?&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>