LM81BIMT-3 NSC [National Semiconductor], LM81BIMT-3 Datasheet

LM81BIMT-3

Manufacturer Part Number

LM81BIMT-3

Description

Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor

Manufacturer

NSC [National Semiconductor]

Datasheets

1.LM81BIMT-3.pdf (33 pages)

2.LM81BIMT-3.pdf (33 pages)

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LM81

Serial Interface ACPI-Compatible Microprocessor System

Hardware Monitor

General Description

The LM81 is a highly integrated data acquisition system for

hardware monitoring of servers, Personal Computers, or

virtually any microprocessor-based system. In a PC, the

LM81 can be used to monitor power supply voltages, tem-

peratures, and fan speeds. Actual values for these inputs

can be read at any time. Programmable WATCHDOG limits

in the LM81 activate a fully programmable and maskable

interrupt system with two outputs (INT and T_CRIT_).

The LM81 has an on-chip digital output temperature sensor

with 9-bit or 12-bit resolution, a 6 analog input ADC with 8-bit

resolution and an 8-bit DAC. Two fan tachometer outputs

can be measured with the LM81’s FAN1 and FAN2 inputs.

The DAC, with a 0 to 1.25V output voltage range, can be

used for fan speed control. Additional inputs are provided for

Chassis Intrusion detection circuits, and VID monitor inputs.

The LM81 has a Serial Bus interface that is compatible with

SMBus

Features

n Temperature sensing

n 6 positive voltage inputs with scaling resistors to monitor

n 8-bit DAC output for controlling fan speed

n 2 fan speed monitoring inputs

Typical Application

# Indicates Active Low (“Not”)

+5V, +12V, +3.3V, +2.5V, Vccp power supplies directly

™

DS100072

n Chassis Intrusion detector input

n WATCHDOG comparison of all monitored values

n SMBus 1.0 (LM81C) and 1.1 (LM81B) Serial Bus

n LM81B has improved voltage monitoring accuracy

n VID0-VID4 monitoring inputs

Key Specifications

Applications

n System Thermal and Hardware Monitoring for Servers

n Office Electronics

n Electronic Test Equipment and Instrumentation

interface compatibility

and PCs

Voltage Monitoring Error

Temperature Error

Supply Voltage Range

Supply Current

ADC and DAC Resolution

Temperature Resolution

−40˚C to +125˚C

DS100072-1

+2% or

February 2002

2.8V to 3.8V

www.national.com

0.4 mA (typ)

1.2% (max)

3˚C (max)

8 Bits

0.5˚C

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