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<head><title>Pin Descriptions</title>
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<div class="MCBreadcrumbsBox_0"><span class="MCBreadcrumbsPrefix">You are here: </span><a class="MCBreadcrumbsLink" href="BS_Chart.htm">BASIC Stamp Hardware</a><span class="MCBreadcrumbsDivider"> &gt; </span><span class="MCBreadcrumbs">Pin Descriptions</span>
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<h1>Pin Descriptions</h1>
<div class="ImagePlusCaption">
<div class="Col2">
<p>
<img src="../graphics/pgm_icon1.gif" border="0" alt="BS1 icon" title="BS1 icon" />
<img src="../graphics/pgm_icon2.gif" border="0" alt="BS2 icon" title="BS2 icon" />
<img src="../graphics/pgm_icon2e.gif" border="0" alt="BS2e icon" title="BS2e icon" />
<img src="../graphics/pgm_icon2sx.gif" border="0" alt="BS2sx icon" title="BS2sx icon" />
<img src="../graphics/pgm_icon2p.gif" border="0" alt="BS2p icon" title="BS2p icon" />
<img src="../graphics/pgm_icon2pe.gif" border="0" alt="BS2pe icon" title="BS2pe icon" />
<img src="../graphics/pgm_icon2px.gif" border="0" alt="BS2px icon" title="BS2px icon" />
</p>
</div>
<p style="text-align: right;">&#160;</p>
<p>&#160;</p>
</div>
<p class="clear">&#160;</p>
<p class="PlainText">&#160;</p>
<h2>BASIC Stamp 1</h2>
<table width="100%" cellpadding="4" cellspacing="0" border="1">
<col />
<col />
<col />
<col />
<tr bgcolor="CFCFCF">
<td rowspan="8" style="background-color: #ffffff;">
<img src="../Resources/Images/BS1pinout.png" />
</td>
<td width="15%">Pin
</td>
<td width="15%">Name
</td>
<td width="70%">Description
</td>
</tr>
<tr>
<td>
<p>1</p>
</td>
<td>
<p>VIN</p>
</td>
<td>
<p>Unregulated power in: accepts 5.5 - 15 VDC (6-40 VDC on BS1&#8209;IC rev. b), which is then internally regulated to 5 volts. May be left unconnected if 5 volts is applied to the VDD (+5V) pin.</p>
</td>
</tr>
<tr>
<td>
<p>2</p>
</td>
<td>
<p>VSS</p>
</td>
<td>
<p>System ground: connects to BS1 Serial Adapter ground for programming.</p>
</td>
</tr>
<tr>
<td>
<p>3</p>
</td>
<td>
<p>PCO</p>
</td>
<td>
<p>PC Out: 4800 baud serial output (TTL level) to PC.</p>
</td>
</tr>
<tr>
<td>
<p>4</p>
</td>
<td>
<p>PCI</p>
</td>
<td>
<p>PC In:&#160; 4800 baud serial input (TTL level) from PC.</p>
</td>
</tr>
<tr>
<td>
<p>5</p>
</td>
<td>
<p>VDD</p>
</td>
<td>
<p>5-volt DC input/output: (Also called +5V) if an unregulated voltage is applied to the VIN pin, then this pin will output 5 volts.&#160; If no voltage is applied to the VIN pin, then a regulated voltage between 4.5V and 5.5V should be applied to this pin.</p>
</td>
</tr>
<tr>
<td>
<p>6</p>
</td>
<td>
<p>RES</p>
</td>
<td>
<p>Reset input/output: goes low when power supply is less than approximately 4.2 volts, causing the BASIC Stamp to reset.&#160; Can be driven low to force a reset.&#160; This pin is internally pulled high and may be left disconnected if not needed.&#160; Do not drive high.</p>
</td>
</tr>
<tr>
<td>
<p>7-14</p>
</td>
<td>
<p>P0-P7</p>
</td>
<td>
<p>General-purpose I/O pins: each can sink 25 mA and source 20 mA. However, the total of all pins should not exceed 50 mA (sink) and 40 mA (source).</p>
</td>
</tr>
</table>
<h2>BASIC Stamp 2</h2>
<table width="100%" cellpadding="4" cellspacing="0" border="1">
<col />
<col />
<col />
<col />
<tr bgcolor="CFCFCF">
<td rowspan="10" style="background-color: #ffffff;">
<img src="../Resources/Images/BS24_dimensions.png" />
</td>
<td width="15%">Pin
</td>
<td width="15%">Name
</td>
<td width="70%">Description
</td>
</tr>
<tr>
<td>1
</td>
<td>SOUT
</td>
<td>Serial Out: connects to PC serial port RX pin (DB9 pin 2 / DB25 pin 3) for programming.
</td>
</tr>
<tr>
<td>2
</td>
<td>SIN
</td>
<td>Serial In: connects to PC serial port TX pin (DB9 pin 3 / DB25 pin 2) for programming.
</td>
</tr>
<tr>
<td>3
</td>
<td>ATN
</td>
<td>Attention: connects to PC serial port DTR pin (DB9 pin 4 / DB25 pin 20) for programming.
</td>
</tr>
<tr>
<td>4
</td>
<td>VSS
</td>
<td>System ground: (same as pin 23) connects to PC serial port GND pin (DB9 pin 5 / DB25 pin 7) for programming.
</td>
</tr>
<tr>
<td>5-20
</td>
<td>P0-P15
</td>
<td>General-purpose I/O pins: each can sink 25 mA and source 20 mA. However, the total of all pins should not exceed 50 mA (sink) and 40 mA (source) if using the internal 5-volt regulator.&#160; The total per 8-pin groups (P0 P7 or P8 15) should not exceed 50 mA (sink) and 40 mA (source) if using an external 5-volt regulator.
</td>
</tr>
<tr>
<td>21
</td>
<td>VDD
</td>
<td>5-volt DC input/output: if an unregulated voltage is applied to the VIN pin, then this pin will output 5 volts.&#160; If no voltage is applied to the VIN pin, then a regulated voltage between 4.5V and 5.5V should be applied to this pin.
</td>
</tr>
<tr>
<td>22
</td>
<td>RES
</td>
<td>Reset input/output: goes low when power supply is less than approximately 4.2 volts, causing the BASIC Stamp to reset.&#160; Can be driven low to force a reset.&#160; This pin is internally pulled high and may be left disconnected if not needed.&#160; Do not drive high.
</td>
</tr>
<tr>
<td>23
</td>
<td>VSS
</td>
<td>System ground: (same as pin 4) connects to power supplys ground (GND) terminal.
</td>
</tr>
<tr>
<td>24
</td>
<td>VIN
</td>
<td>Unregulated power in: accepts 5.5 - 15 VDC (6-40 VDC on BS2-IC Rev. e, f, and g), which is then internally regulated to 5 volts. Must be left unconnected if 5 volts is applied to the VDD (+5V) pin.
</td>
</tr>
</table>
<h2>BASIC Stamp 2e, 2sx, 2p, 2pe, 2px</h2>
<table width="100%" cellpadding="4" cellspacing="0" border="1">
<col />
<col />
<col />
<col />
<tr bgcolor="CFCFCF">
<td rowspan="10" style="background-color: #ffffff;">
<img src="../Resources/Images/BS24_dimensions.png" />
</td>
<td width="15%">Pin
</td>
<td width="15%">Name
</td>
<td width="70%">Description
</td>
</tr>
<tr>
<td>
<p>1</p>
</td>
<td>
<p>SOUT</p>
</td>
<td>
<p>Serial Out: connects to PC serial port RX pin (DB9 pin 2 / DB25 pin 3) for programming.</p>
</td>
</tr>
<tr>
<td>
<p>2</p>
</td>
<td>
<p>SIN</p>
</td>
<td>
<p>Serial In: connects to PC serial port TX pin (DB9 pin 3 / DB25 pin 2) for programming.</p>
</td>
</tr>
<tr>
<td>
<p>3</p>
</td>
<td>
<p>ATN</p>
</td>
<td>
<p>Attention: connects to PC serial port DTR pin (DB9 pin 4 / DB25 pin 20) for programming.</p>
</td>
</tr>
<tr>
<td>
<p>4</p>
</td>
<td>
<p>VSS</p>
</td>
<td>
<p>System ground: (same as pin 23), connects to PC serial port GND pin (DB9 pin 5 / DB25 pin 7) for programming.</p>
</td>
</tr>
<tr>
<td>
<p>5-20</p>
</td>
<td>
<p>P0-P15</p>
</td>
<td>
<p>General-purpose I/O pins: each can source and sink 30 mA. However, the total of all pins should not exceed 75 mA (source or sink) if using the internal 5-volt regulator.&#160; The total per 8-pin groups P0 P7 or P8 15 should not exceed 60 mA (source or sink) if using an external 5-volt regulator.</p>
</td>
</tr>
<tr>
<td>
<p>21</p>
</td>
<td>
<p>VDD</p>
</td>
<td>
<p>5-volt DC input/output: if an unregulated voltage is applied to the VIN pin, then this pin will output 5 volts.&#160; If no voltage is applied to the VIN pin, then a regulated voltage between 4.5V and 5.5V should be applied to this pin.</p>
</td>
</tr>
<tr>
<td>
<p>22 </p>
</td>
<td>
<p>RES</p>
</td>
<td>
<p>Reset input/output: goes low when power supply is less than approximately 4.2 volts, causing the BASIC Stamp to reset.&#160; Can be driven low to force a reset.&#160; This pin is internally pulled high and may be left disconnected if not needed.&#160; Do not drive high.</p>
</td>
</tr>
<tr>
<td>
<p>23 </p>
</td>
<td>
<p>VSS</p>
</td>
<td>
<p>System ground: (same as pin 4) connects to power supplys ground (GND) terminal.</p>
</td>
</tr>
<tr>
<td>
<p>24 </p>
</td>
<td>
<p>VIN</p>
</td>
<td>
<p>Unregulated power in: accepts 5.5 - 12 VDC (7.5 recommended), which is then internally regulated to 5 volts. Must be left unconnected if 5 volts is applied to the VDD (+5V) pin.</p>
</td>
</tr>
</table>
<h2>BASIC Stamp 2p40</h2>
<table width="100%" cellpadding="4" cellspacing="0" border="1">
<col />
<col />
<col />
<col />
<tr bgcolor="CFCFCF">
<td rowspan="11" style="background-color: #ffffff;">
<img src="../Resources/Images/BS40_dimensions.png" />
</td>
<td width="15%">Pin
</td>
<td width="15%">Name
</td>
<td width="70%">Description
</td>
</tr>
<tr>
<td>
<p>1</p>
</td>
<td>
<p>SOUT</p>
</td>
<td>
<p>Serial Out: connects to PC serial port RX pin (DB9 pin 2 / DB25 pin 3) for programming.</p>
</td>
</tr>
<tr>
<td>
<p>2</p>
</td>
<td>
<p>SIN</p>
</td>
<td>
<p>Serial In: connects to PC serial port TX pin (DB9 pin 3 / DB25 pin 2) for programming.</p>
</td>
</tr>
<tr>
<td>
<p>3</p>
</td>
<td>
<p>ATN</p>
</td>
<td>
<p>Attention: connects to PC serial port DTR pin (DB9 pin 4 / DB25 pin 20) for programming.</p>
</td>
</tr>
<tr>
<td>
<p>4</p>
</td>
<td>
<p>VSS</p>
</td>
<td>
<p>System ground: (same as pin 39) connects to PC serial port GND pin (DB9 pin 5 / DB25 pin 7) for programming.</p>
</td>
</tr>
<tr>
<td>
<p>5-20</p>
</td>
<td>
<p>P0-P15</p>
</td>
<td>
<p>General-purpose I/O pins: each can source and sink 30 mA. However, the total of all pins (including X0-X15) should not exceed 75 mA (source or sink) if using the internal 5-volt regulator.&#160; The total per 8-pin groups (P0 P7, P8 15, X0 X7 or X8 X15)&#160; should not exceed 100 mA (source or sink) if using an external 5-volt regulator.</p>
</td>
</tr>
<tr>
<td>
<p>21-36</p>
</td>
<td>
<p>X0-X15</p>
</td>
<td>
<p>Auxiliary Bank of General-purpose I/O pins: each can source and sink 30 mA. However, the total of all pins (including P0 P15) should not exceed 75 mA (source or sink) if using the internal 5-volt regulator.&#160; The total per 8-pin groups (P0 P7, P8 15, X0 X7 or X8 X15) should not exceed 60 mA (source or sink) if using an external 5-volt regulator.</p>
</td>
</tr>
<tr>
<td>
<p>37</p>
</td>
<td>
<p>VDD</p>
</td>
<td>
<p>5-volt DC input/output: if an unregulated voltage is applied to the VIN pin, then this pin will output 5 volts.&#160; If no voltage is applied to the VIN pin, then a regulated voltage between 4.5V and 5.5V should be applied to this pin.</p>
</td>
</tr>
<tr>
<td>
<p>38</p>
</td>
<td>
<p>RES</p>
</td>
<td>
<p>Reset input/output: goes low when power supply is less than approximately 4.2 volts, causing the BASIC Stamp to reset.&#160; Can be driven low to force a reset.&#160; This pin is internally pulled high and may be left disconnected if not needed.&#160; Do not drive high.</p>
</td>
</tr>
<tr>
<td>
<p>39</p>
</td>
<td>
<p>VSS</p>
</td>
<td>
<p>System ground: (same as pin 4) connects to power supplys ground (GND) terminal.</p>
</td>
</tr>
<tr>
<td>
<p>40</p>
</td>
<td>
<p>VIN</p>
</td>
<td>
<p>Unregulated power in: accepts 5.5 - 12 VDC (7.5 recommended), which is then internally regulated to 5 volts. Must be left unconnected if 5 volts is applied to the VDD (+5V) pin.</p>
</td>
</tr>
</table>
<p>&#160;</p>
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<p MadCap:conditions="BSEconditions.BSEWebHelp (Primary)-INCLUDE"><a href="../HomeTopics/HomePage.htm">Go to Welcome page</a>
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<p style="text-align: right;"><span class="ContactInfoProjectName">BASIC Stamp Help</span> <![CDATA[ ]]><span class="ContactInfoVersion#">Version 2.5.4</span> <![CDATA[ ]]></p>
<p style="text-align: right;">Copyright ©&#160;<span class="ContactInfoCompanyName">Parallax Inc.</span></p>
<p style="text-align: right;"><span class="SystemShortDate">8/8/2012</span>
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