LM80 Datasheet | National Semiconductor

Description The LM80 provides 7 positive voltage inputs, temperature measurement, fan speed measurement, and hardware monitoring on an I2C™ interface. The LM80 performs WATCHDOG™ parisons of all measured values and an open-drain interrupt output bees active when any values exceed programmed limits. A Chassis Intrusion input is provided to monitor and reset an external circuit designed to latch a chassis intrusion event. The LM80 is especially suited to interface to both linear and digital temperature sensors. The 10 m V LSB and 2.56 volt input range is ideal for accepting inputs from a linear sensor such as the LM50. The BTI is used as an input from either digital or thermostat sensors such as LM75 and LM56. The LM80’s 2.8V to 5.75V supply voltage range, low supply current, and I2C interface make it ideal for a wide range of applications. These include hardware monitoring and protection applications in personal puters, electronic test equipment, and office electronics. n WATCHDOG parison of all monitored values n Separate input to show status in Interrupt Status Register of additional external temperature sensors such as the LM56 or LM75 n I2C Serial Bus interface patibility n Shutdown mode to minimize power consumption n Programmable RST_OUT/OS pin: RST_OUT provides a Reset output; OS provides an Interrupt Output activated by an Overtemperature Shutdown event Key Specifications n Voltage monitoring Error n Temperature Error - 25˚C to +125˚C n Supply Voltage Range n Supply Current n ADC Resolution n Temperature Resolution Operating: Shutdown: ± 1% (max) ± 3˚C (max) 2.8V to 5.75V 0.2 m A typ 15 µA typ 8 Bits 0.5˚C Features Temperature sensing 7 positive voltage inputs 2 programmable fan speed monitoring inputs 10 m V LSB and 2.56V input range accepts outputs from linear temperature sensors such as the LM50 n Chassis Intrusion Detector input n n n n Applications n System Thermal and Hardware Monitoring for Servers and PCs n Office Electronics n Electronic Test...