Definition: SMBus

(System Management BUS) An interface between the CPU and computer system components used for low-speed system management communications. Designed by Intel and introduced on its Xeon chips, SMBus is used among other things to send charging requirements to the CPU from the battery. SMBus includes a Processor Information ROM (PIROM) that contains data about the processor and an empty EEPROM that can be used by manufacturers and resellers to record usage and service information.