LM80 - Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor

	LM80 - Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor

Datasheet	Packaging	Samples & Pricing	Reliability	Design Tools	Knowledge Base

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

Key Specification

Voltage monitoring Error		±1% (max)
Temperature Error -25°C to +125°C		± 3°C (max)
Supply Voltage Range		2.8V to 5.75V
Supply Current	Operating:	0.2 mA typ
	Shutdown:	15 µA typ
ADC Resolution		8 Bits
Temperature Resolution		0.5°C

General Description

The LM80 provides 7 positive voltage inputs, temperature measurement, fan speed measurement, and hardware monitoring on an I²C™ interface. More...

Applications

•	System Thermal and Hardware Monitoring for Servers and PCs
•	Office Electronics
•	Electronic Test Equipment and Instrumentation

Typical Application

See Datasheet for Application Information

Parametric Table expand

Parametric Table collapse

Temp Resolution	9-bit/0.5degC
Analog Inputs	7
ADC Resolution	8 bit
Fan Speed Inputs	2
Fan Control Method	Undefined
VID Inputs	Undefined

Temp Resolution	9-bit/0.5degC
TruTherm(TM) Beta Compensation	No
Analog Inputs	7
ADC Resolution	8 bit
Fan Speed Inputs	2
Fan Control Output(s)	Undefined
Fan Control Method	Undefined
VID Inputs	Undefined
Dynamic VID VCCP Monitoring	Undefined
Bidirectional PROCHOT Support	Undefined
GPIOs	CI, RESET, BTI, INT_IN
Interrupt Outputs	2
Reference Voltage	Undefined
Temperature Accuracy (+/-)	3 deg C
Temperature Min	-25 deg C
Temperature Max	125 deg C
Interface Type	2-Wire Serial
Supply Min	2.8 Volt
Supply Max	5.75 Volt
Quiescent Current	1 mA
Resolution	9 bit
Temperature Accuracy (+/-)	3 deg C
PowerWise	Yes
View Using Catalog

Additional Resources

Design Tools (see below)

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor	438 Kbytes	26-Jun-01	View Online	Download	Receive via Email
LM80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor (Japanese)	284 Kbytes

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Weeks

Qty

$US each

LM80CIMT-3

TSSOP

STD

NOPB

260

RoHS

Download

Full production

N/A

1K+

$2.90

rail
of
61

NSUZXYTT
LM80
CIMT-3

6 weeks

1000

LM80CIMT-5

TSSOP

NOPB

260

RoHS

Download

Full production

N/A

1K+

$2.90

rail
of
61

NSUZXYTT
LM80
CIMT-5

6 weeks

100

LM80CIMTX-3

TSSOP

STD

NOPB

260

RoHS

Download

Full production

N/A

1K+

$2.90

reel
of
2500

NSUZXYTT
LM80
CIMT-3

6 weeks

3000

LM80CIMTX-5

TSSOP

STD

NOPB

260

RoHS

Download

Full production

N/A

1K+

$2.90

reel
of
2500

NSUZXYTT
LM80
CIMT-5

6 weeks

5000

General 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.

Reliability Metrics

Part Number	Process	Early Failure Rate - Rejects	Sample Size (EFR)	PPM *	Rel. Rejects	Device Hours	Long Term Failure Rates (FITS)	MTTF
LM80CIMT-3	CS100	1	10835	93	0	358000	10	101583477
LM80CIMT-5	CS100	1	10835	93	0	358000	10	101583477
LM80CIMTX-3	CS100	1	10835	93	0	358000	10	101583477
LM80CIMTX-5	CS100	1	10835	93	0	358000	10	101583477

For more information on Reliability Metrics, please click here.

Design Tools

Title	Size in Kbytes	Date
LMxx - Windows 95/98 VXD drivers with stand alone application for talking to temperature sensors or hardware monitors on a mother board	1366 Kbytes	28-Jul-2003	View	Download	Receive via Email

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 24-Jul-2008]