LM80 - Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor from the PowerWise® Family

Datasheet Packaging Samples & Pricing Reliability Design Tools Application Notes 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 CurrentOperating: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
TruTherm(TM) Beta Compensation No
Analog Inputs 7
ADC Resolution 8 bits
Fan Speed Inputs 2
Fan Control Output(s) Undefined
Fan Control Method Undefined
VID Inputs Undefined
Temp Resolution 9-bit/0.5degC
TruTherm(TM) Beta Compensation No
Analog Inputs 7
ADC Resolution 8 bits
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 bits
Temperature Accuracy (+/-) 3 deg C
PowerWise Yes
View Using Catalog

Additional Resources

Design Tools (see below)

Application Notes (see below)



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor 438 Kbytes 26-Jun-01 Download
LM80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor (Japanese)
 284 Kbytes   Download

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


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM80CIMT-3TSSOP24STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$2.90rail
of
61		NSUZXYTT
LM80
CIMT-3
6 weeks500
LM80CIMT-5TSSOP24NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$2.90rail
of
61		NSUZXYTT
LM80
CIMT-5
6 weeks500
LM80CIMTX-3TSSOP24STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$2.90reel
of
2500		NSUZXYTT
LM80
CIMT-3
6 weeks3000
LM80CIMTX-5TSSOP24STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$2.90reel
of
2500		NSUZXYTT
LM80
CIMT-5
6 weeks3000

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 EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM80CIMT-3CS1001139867208980004254809951
LM80CIMT-5CS1001139867208980004254809951
LM80CIMTX-3CS1001139867208980004254809951
LM80CIMTX-5CS1001139867208980004254809951

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Design Tools

TitleSize in Kbytes Date Click link below to Download    
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  

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

More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1155: Application Note 1155 A Simple Software I2C Routine for the COP8 82 Kbytes 15-May-04 Download
AN-1260: Application Note 1260 Autonomous Fan Control for Processor Systems Using the LM85 74 Kbytes 10-Mar-04 Download
AN-1262: Application Note 1262 Four-Speed Fan Control Using Simple Remote Diode Temperature Sensor 70 Kbytes 1-Oct-02 Download

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

[Information as of 4-Jul-2009]