ADM1028ARQ

GENERAL
The ADM1028 is a low-cost temperature monitor and fan controller for microprocessor-based systems.
The temperature of a remote sensor diode may be measured, allowing monitoring of processor temperature in single processor systems. An on-chip temperature sensor monitors ambient system temperature.Measured values can be read out via the System Management Bus, and values for limit comparisons can be programmed in over the same serial bus.
The ADM1028 also contains a DAC for fan speed control. An automatic hardware temperature trip point is provided and the fan will be driven to full speed if it is exceeded. A Ramp Rate Register is provided to control the rate with which fan speed is increased or decreased. This is to eliminate sudden changes in fan speed, thereby reducing fan acoustics and prolonging the fan’s life.
FEATURES On-Chip Temperature Sensor External Temperature Measurement with Remote Diode Interrupt and Over-Temperature Outputs Fault-Tolerant Fan Control with Auto Hardware Trip Point Remote Reset and Power-Down Functions LDCM Support System Management Bus (SMBus) Communications Standby Mode to Minimize Power Consumption Limit Comparison of all Monitored Values DAC Output for Linear Fan Speed Control Ramp Rate Register for Control of Rate of Change of Fan Speed, Reduction of Fan AcousticsAPPLICATIONS Network Servers and Personal Computers Microprocessor-Based Office Equipment Test Equipment and Measuring Instruments