LM80CIMT-5 NSC [National Semiconductor], LM80CIMT-5 Datasheet

LM80CIMT-5

Manufacturer Part Number

LM80CIMT-5

Description

Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor

Manufacturer

NSC [National Semiconductor]

Datasheets

1.LM80CIMTX-5.pdf (29 pages)

2.LM80CIMT-5.pdf (29 pages)

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Download datasheet (439Kb)

LM80

Serial Interface ACPI-Compatible Microprocessor System

Hardware Monitor

General Description

The LM80 provides 7 positive voltage inputs, temperature

measurement, fan speed measurement, and hardware

monitoring on an I

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 pro-

vided 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 I

applications. These include hardware monitoring and protec-

tion applications in personal computers, electronic test

equipment, and office electronics.

Features

n Temperature sensing

n 7 positive voltage inputs

n 2 programmable fan speed monitoring inputs

n 10 mV LSB and 2.56V input range accepts outputs from

n Chassis Intrusion Detector input

Typical Application

# Indicates Active Low (“Not”)

I 2 C

linear temperature sensors such as the LM50

is a registered trademark of the Philips Corporation.

C interface make it ideal for a wide range of

™

interface. The LM80 performs

DS100040

n WATCHDOG comparison of all monitored values

n Separate input to show status in Interrupt Status

n I

n Shutdown mode to minimize power consumption

n Programmable RST_OUT/OS pin: RST_OUT provides a

Key Specifications

Applications

n System Thermal and Hardware Monitoring for Servers

n Office Electronics

n Electronic Test Equipment and Instrumentation

as the LM56 or LM75

Reset output; OS provides an Interrupt Output activated

by an Overtemperature Shutdown event

and PCs

Voltage monitoring Error

Temperature Error

Supply Voltage Range

Supply Current

ADC Resolution

Temperature Resolution

−25˚C to +125˚C

C Serial Bus interface compatibility

DS100040-1

Shutdown:

Operating:

www.national.com

0.2 mA typ

June 2001

3˚C (max)

1% (max)

15 µA typ

2.8V to

5.75V

8 Bits

0.5˚C

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