The LM81 is a highly integrated data acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor-based system. In a PC, the LM81 can be used to monitor power supply voltages, temperatures, and fan speeds. Actual values for these inputs can be read at any time. Programmable WATCHDOG limits in the LM81 activate a fully programmable and maskable interrupt system with two outputs (INT and T_CRIT_).
Features
■ Temperature sensing
■ 6 positive voltage inputs with scaling resistors to monitor +5V, +12V, +3.3V, +2.5V, Vccp power supplies directly
■ 8-bit DAC output for controlling fan speed
■ 2 fan speed monitoring inputs
■ Chassis Intrusion detector input
■ WATCHDOG comparison of all monitored values
■ SMBus 1.0 (LM81C) and 1.1 (LM81B) Serial Bus interface compatibility
■ LM81B has improved voltage monitoring accuracy
■ VID0-VID4 monitoring inputs
Applications
■ System Thermal and Hardware Monitoring for Servers and PCs
