Thermal issues continue to escalate in the PC-processor sector. Early processors required huge passive heat sinks and then fans dedicated to the processor-cooling task. Now, reliable systems need active monitoring of systems and even chip temperature with real-time fan control. Andigilog targets just such applications with its ThermalEdge technology. The company has just announced two thermal-management chips: the aSC7512 (block diagram) that targets traditional motherboard designs and the aMC8500 for the new BTX (Balance Technology Extended) technology. Intel designed BTX designed for shrinking form factors, and it moves the PC to mechanically separate subsystems with different cooling, power, and other needs.

The aSC7512 includes an on-chip temperature sensor and remote die-temperature-sensing capability using a connection to the diode integrated on a processor die. The chip supports three- and four-wire fans and integrates a digital filter that makes for smoother fan operation. The aMC8500 can drive a 1A, brushless-dc fan and integrates the requisite MOSFET motor drives. Andigilog will ship samples of the chips, as well as reference designs, in April. The aSC7512 will sell for $1.50 (1000), and the aMC8500 will sell for $1.45 (1000).