LM80

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SNIS102F – JUNE 1999 – REVISED MARCH 2013

LM80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor

Check for Samples: LM80

1

FEATURES

KEY SPECIFICATIONS

2

•

Temperature Sensing

•

Voltage Monitoring Error ±1% (Max)

•

7 Positive Voltage Inputs

•

Temperature Error (

−25°C to +125°C) ±3°C

(Max)

•

2 Programmable Fan Speed Monitoring Inputs

•

Supply Voltage Range 2.8 to 5.75 V

•

10 mV LSB and 2.56V Input Range Accepts

Outputs From Linear Temperature Sensors

•

Supply Current: Operating 0.2 mA typ

Such as the LM50

•

Supply Current: Shutdown 15 µA typ

•

Chassis Intrusion Detector Input

•

ADC Resolution 8 Bits

•

WATCHDOG Comparison of all Monitored

•

Temperature Resolution 0.5ºC

Values

•

Separate Input to Show Status in Interrupt

DESCRIPTION

Status Register of Additional External

The

LM80

provides

7

positive

voltage

inputs,

Temperature Sensors such as the LM56 or

temperature measurement, fan speed measurement,

LM75

LM80 performs WATCHDOG comparisons of all

•

measured values and an open-drain interrupt output

•

Shutdown Mode to Minimize Power

becomes

active

when

any

values

exceed

Consumption

programmed limits. A Chassis Intrusion input is

provided to monitor and reset an external circuit

•

Programmable RST_OUT/OS pin: RST_OUT

designed to latch a chassis intrusion event.

Provides a Reset Output; OS Provides an

Interrupt Output Activated by an

The LM80 is especially suited to interface to both

Overtemperature Shutdown Event

linear and digital temperature sensors. The 10 mV

LSB and 2.56 volt input range is ideal for accepting

APPLICATIONS

inputs from a linear sensor such as the LM50. The

BTI is used as an input from either digital or

•

System Thermal and Hardware Monitoring for

thermostat sensors such as LM75 and LM56.

Servers and PCs

The LM80's 2.8V to 5.75V supply voltage range, low

•

Office Electronics

•

Electronic Test Equipment and

wide range of applications. These include hardware

Instrumentation

monitoring and protection applications in personal

computers, electronic test equipment, and office

electronics.

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.