Method for monitoring device by SMBus chip on PCI plate and its device

The invention discloses an approach and equipment of using SMBus chip monitor device. It relates to bus extension and chip application. The invention is to extend SMBus node. Using SMBus chip on PCI board; device parameters such as pressure, rotate speed and temperature are measured. Temperature signal is served as feedback to input chip and computed and controlled inside chip. Through amplification driver circuit, fan rotate speed is controlled to form closed loop. The equipment is made up with monitor chip on PCI board, temperature sensor, amplification driver circuit, fan, power supply, rotate speed measure matching circuit, voltage division circuit and SMBus. Merits of the invention are: being able to monitor PCI board, such as monitoring and controlling fan's rotate, reducing noise, protecting environment and being helpful to manager computer device by communicating with computer through SMBus.