1) stipulate how much heat may be safely dissipated through a notebook's keyboard without causing user discomfort. Rigid power dissipation specifications such as 'Mobile power guidelines '99' (Ref. PCs have also begun to become smaller and less conventional in size and shape-as can be seen in any of the latest concept PCs or slim-line notebooks on the market. The need to safely dissipate this heat, along with moves in the computing industry to develop 'Green PCs' and user-friendly machines (as Internet appliances become mainstream) has driven the need for and development of more sophisticated cooling and thermal management techniques. Their impressive improvements in speed and system performance are accompanied by the generation of increasing amounts of heat within the machines that use them. BackgroundĪs the new millennium dawns, processors are achieving speeds of 1 GHz and more. We discuss here the need for this level of sophisticated control and the issues inherent in providing it. Providing fan speed control based on the temperatures measured within the system, these new products offer more-complete thermal-management solutions. They build on the core technology used in the ADM102x PC System Monitor product portfolio (see also Analog Dialogue 33-1 and 33-4). During the past year a family of products, including the ADM1029 Dual PWM Fan Controller and Temperature Monitor, the ADM1026, and ADM1030/31 Complete, ACPI-Compliant, Dual-Channel ☑☌ Remote Thermal Monitor with integrated fan controller, for one or two independent fans, have been developed. Intelligent systems-monitoring devices make possible sophisticated fan speed control techniques to provide adequate cooling and maintain optimal thermal performance in the system. Analog Devices offers a comprehensive set of hardware monitoring products for use in desktop and notebook PCs, and servers.

Bios fan speed