System Management Bus
<hardware, protocol> (SMBus, SMB) A simple two-wire bus used for
communication with low-bandwidth devices on a motherboard, especially power
related chips such as a laptop's rechargeable battery subsystem (see Smart
Battery Data). Other devices might include temperature sensors and lid switches.
A device can provide manufacturer information, indicate its model/part number,
save its state for a suspend event, report different types of errors, accept
control parameters, and return status. The SMB is generally not user
configurable or accessible.
The bus carries clock, data, and instructions and is based on Philip's I2C
serial bus protocol. Support for SMBus devices is provided on Windows 2000.
Windows 98 does not support such devices.
The PIIX4 chipset provides SMBus functionality. Vendors using SMBus would be
required to pay royalties.
SMBus website.
Software to interrogate a SMB motherboard.
SMB devices, Part 8 Kernel Mode Driver Design Guide, Win2000 DDK.
(1999-08-08)
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