LM80

Features:

· Temperature sensing
· 7 positive voltage inputs
· 2 programmable fan speed monitoring inputs
·10 mV LSB and 2.56V input range accepts outputs from linear temperature sensors such as the LM50
·Chassis Intrusion Detector input
· WATCHDOG comparison of all monitored values
· Separate input to show status in Interrupt Status Register of additional external temperature sensors such as the LM56 or LM75
· I2C Serial Bus interface compatibility
· Shutdown mode to minimize power consumption
· Programmable RST_OUT/OS pin: RST_OUT provides a Reset output; OS provides an Interrupt Output activated by an Overtemperature Shutdown event


Specifications

Positive Supply Voltage (V⁺) .................................................................................6.5V
Voltage on Any Input or Output Pin ...............................................−0.3V to (V⁺+0.3V)
Ground Difference (GND - GNDA) ...................................................................±300 mV
Input Current at any Pin (Note 3) .....................................................................±5 mA
Package Input Current (Note 3) ......................................................................±20 mA
Maximum Junction Temperature
(T_{J max}) .............................................................................................................150°C
ESD Susceptibility(Note 5)
Human Body Model ..............................................................................................2000V
Machine Model .......................................................................................................125V
Soldering Information
MTC24B Package (Note 6) :
Vapor Phase (60 seconds) ..................................................................................215°C
Infrared (15 seconds) ..........................................................................................235°C
Storage Temperature ........................................................................−65°C to +150°C


Description

The LM80 provides 7 positive voltage inputs, temperature measurement, fan speed measurement, and hardware monitoring on an I2C™ interface. The LM80 performs WATCHDOG™ comparisons of all measured values and an open-drain interrupt output becomes 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 mV 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 computers, electronic test equipment, and office electronics.