SMBus Specifications

<body>  <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td valign="top"> <div align="left"> <table border="0" cellpadding="0" cellspacing="0" width="600"> <tr> <td> <h2><font face="Comic Sans MS"><a name="Top">SMBus</a> Specifications</font></h2> <p><font face="Arial" size="2">This page contains the released specifications, newly published updates and new specifications for review. Use these browser buttons to find the specifications easily. </font></p> <h4><font face="Comic Sans MS"><a HREF="spec_content.htm#Updates"><img SRC="../images/Pencil_paper.gif" BORDER="0" WIDTH="20" HEIGHT="18"></a> </font><a href="spec_content.htm#New" target="main"><font face="Comic Sans MS">Public Review DRAFT Specifications</font></a></h4> <h4><font face="Comic Sans MS"><a HREF="spec_content.htm#Updates"><img SRC="../images/Pencil_paper.gif" BORDER="0" WIDTH="20" HEIGHT="18"></a> <a HREF="spec_content.htm#Updates">Current Specifications</a></font></h4> <h4><font face="Comic Sans MS"><a HREF="spec_content.htm#Existing"><img SRC="../images/Pencil_paper.gif" BORDER="0" WIDTH="20" HEIGHT="18"></a> </font><a HREF="spec_content.htm#Existing"><font face="Comic Sans MS">Past Release of Specification</font></a></h4> <p><img SRC="/images/line_col.gif" WIDTH="585" HEIGHT="1"></p> <h4><a name="New"></a><font face="Comic Sans MS">Public Review of a DRAFT Specifications<br> </font><font face="Arial" color="#FF0000" size="2">There are no public reviews on-going at this time.<br> </font><a href="spec_content.htm#Top"><font face="Comic Sans MS">Top of Page</font></a><font face="Comic Sans MS"><br> </font><img SRC="/images/line_col.gif" WIDTH="585" HEIGHT="1"> <br> <font face="Comic Sans MS"><a NAME="Updates"></a>Current Release of the SMBus Specifications</font> </h4> <p><font face="Arial" size="2">Technical questions about specifications should be sent to <a href="mailto:techquestions@smiforum.org">techquestions@smiforum.org</a>.</font></p> <ul> <li><font face="Arial" size="2"><a href="SMBus_3_3_1_20241020.pdf"><cite>System Management Bus (SMBus) Specification</cite>, version 3.3.1.</a> <i>20-Oct-2024</i>.<br><br> </font></li> </ul> <h5><a href="spec_content.htm#Top"><font face="Comic Sans MS">Top of Page</font></a><font face="Comic Sans MS"><br> </font><img SRC="/images/line_col.gif" WIDTH="585" HEIGHT="1"> </h5> <h4><font face="Comic Sans MS"><a NAME="Existing"></a>Past Releases of the SMBus Specifications </font></h4> <ul> <li><font face="Arial" size="2"><a href="SMBus_3_3_20240512.pdf"><cite>System Management Bus (SMBus) Specification</cite>, version 3.3.</a> <i>12-May-2024</i>.<br><br> </font></li> <li><font face="Arial" size="2"><a href="SMBus_3_3_20240512.pdf"><cite>System Management Bus (SMBus) Specification</cite>, version 3.3.</a> <i>12-May-2024</i>.<br><br> </font></li> <li><font face="Arial" size="2"><a href="SMBus_3_2_20220112.pdf"><cite>System Management Bus (SMBus) Specification</cite>, version 3.2.</a> <i>12-Jan-2022</i>.<br><br> </font></li> <li><font face="Arial" size="2"><a href="SMBus_3_1_20180319.pdf"><cite>System Management Bus (SMBus) Specification</cite>, version 3.1.</a> <i>19-Mar-2018</i>.<br><br> </font></li> <li><font face="Arial" size="2"><a href="SMBus_3_0_20141220.pdf"><cite>System Management Bus (SMBus) Specification</cite>, version 3.0.</a> <i>Posted: 16-Jan-2015</i>.<br><br> </font></li> <li><font face="Arial" size="2"><a href="smbus20.pdf"><cite>System Management Bus (SMBus) Specification</cite>, version 2.0.</a> <i>Posted: 03-Aug-2000</i>.<br><br> </font></li> <li><font face="Arial" size="2"> <a href="smbus_cmi10.pdf"><cite>SMBus Control Method Interface Specification</cite>, version 1.0.</a> This specification defines a System Management Bus (SMBus) interface for Advanced Configuration and Power Interface (ACPI). This interface, referred to as the SMBus Control Method Interface (CMI), allows the capabilities of an SMBus segment to be easily utilized regardless of hardware origin or implementation. <i>Posted: </i> <em>10-Dec-1999</em><br> <br> </font></li> <li><font size="2"><a href="smbus_driver_ext_arch10.pdf"><font face="Arial"><cite>SMBus Device Driver External Architecture Specification</cite>, version 1.0</font></a><font face="Arial">. This document defines the exposed external interfaces of the SMBus device driver. The SMBus device driver is intended to operate on both Windows 98 and Windows 2000. The device driver conforms to the Windows Driver Model (WDM) as set forth by Microsoft. The device driver uses ACPI SMBus control  methods to communicate with SMBus hardware as defined in the SMBus Control Method Interface Specification. <em>Posted: 10-Dec-1999.</em></font></font></li> <li><small><a href="smbus110.pdf"><font face="Arial" size="2"><cite>System Management Bus (SMBus) Specification</cite>, version 1.1</font></a><font face="Arial" size="2">. <br> <br> </font></small></li> <li><font size="3" face="Arial"><small><a HREF="smb10.pdf"><cite>System Management Bus Specification</cite>, version 1.0</a>: Defines a 2-wire interface through which the battery can communicate with the charger, a system host or other power-related components. View a <a href="smbdef.htm">short description </a>of SMBus commands.<br> <br> </small></font></li> <li><font face="Arial" size="3"><small><a href="smbb10.pdf"><cite>System Management Bus BIOS Specification (SMBus BIOS)</cite></a>: Defines a standard BIOS interface to the System Management Bus. It is designed to abstract the hardware implementation of the SMBus and expose it in a standardized way to higher layers of software. This specification was posted on 15-February-1995.</small></font></li> </ul> <h5><font face="Comic Sans MS" size="2"><a href="spec_content.htm#Top">Top </a></font><font face="Comic Sans MS"><a href="spec_content.htm#Top">of Page</a></font></h5> </td> </tr> </table> </div> <p>  </td> </tr> </table> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td> <div align="left"> <table border="0" cellspacing="1" width="580" height="10"> <tr> <td height="3"><img src="/images/line_col.gif" alt="line_col.gif (479 bytes)" WIDTH="585" HEIGHT="1"></td> </tr> <tr> <td height="16"><font face="Arial" size="1">Questions about this web site should be sent to<br /><a href="mailto:admin@smiforum.org">admin@smiforum.org</a>. <br />Technical questions about SMBus should be sent to<br /><a href="mailto:techquestions@smiforum.org">techquestions@smiforum.org</a>.</font></td> </tr> <tr> <td height="1"><font face="Arial" size="1">Last modified: Monday, October 21, 2024.</font></td> </tr> </table> </div> </td> </tr> </table>  </body>