LM95241 - Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm™ Technology (65nm/90nm) from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Knowledge Base

Features
•Accurately senses die temperature of remote ICs or diode junctions
•Uses TruTherm technology for precision "thermal diode" temperature measurement
•Thermal diode input stage with analog filtering
•Thermal diode digital filtering
•Intel processor on 65nm or 90nm process or 2N3904 non-ideality selection
•Remote diode fault detection
•On-board local temperature sensing
•Remote temperature readings without digital filtering:
•0.125 °C LSb
•10-bits plus sign or 11-bits programmable resolution
•11-bits resolves temperatures above 127 °C
•Remote temperature readings with digital filtering:
•0.03125 °C LSb with filtering
•12-bits plus sign or 13-bits programmable resolution
•13-bits resolves temperatures above 127 °C
•Local temperature readings:
•0.25 °C
•9-bits plus sign
•Status register support
•Programmable conversion rate allows user optimization of power consumption
•Shutdown mode one-shot conversion control
•SMBus 2.0 compatible interface, supports TIMEOUT
•8-pin MSOP package

Key Specification

Remote Diode Temperature Accuracy
TA=20°C to 40°C, TD=45°C to 85°C±1.25 °C (max)
TA=0°C to 85°C, TD=25°C to 140°C±2.5 °C (max)
Local Temperature Accuracy
TA=0°C to 85°C±3.0 °C (max)
Supply Voltage3.0 V to 3.6 V
Average Supply Current471 µA (typ)

General Description

The LM95241 is a precision dual remote diode temperature sensor (RDTS) that uses National's TruTherm technology. More...


Applications

•Processor/Computer System Thermal Management (e.g. Laptop, Desktop, Workstations, Server)
•Electronic Test Equipment
•Office Electronics
  Typical Application
*click for larger image


ParametersValues
Remote Diode Thermal Sensors 2
Temperature Accuracy (+/-) 1.25 deg C
Supply Min 3.0 Volt
Quiescent Current 0.471 mA
Temperature Min 0 deg C
Temperature Max 140 deg C
Interface Type 2-Wire Serial
Programmable Setpoints No
TruTherm(TM) Beta Compensation Yes
Resolution 13 bits
Resolution degC/LSB 0.03125
Supply Max 3.6 Volt
Shut down Yes
Fault Queue No
PowerWise Yes


Typical Performance

click for larger image


  Also Recommended
LM95233▲TCRIT Interrupt Outputs
LM95234▲Quad Remote Diode Sensor With TruTherm(TM) Technology And Interrupt Outputs
Block Diagram
*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM95241 Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm™ Technology (65nm/90nm) 722
Kbytes		 23-Sep-06 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
LM95241EBLM95241EB Evaluation BoardFull productionN/A
 
Buy Now 		1+$120.001-
8 weeksN/A
LM95241CIMMMINI SOIC8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.78reel
of
1000		ZXTT
T28C
12 weeks2000
LM95241CIMM-1MINI SOIC8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.78reel
of
1000		ZXTT
T29C
12 weeks1000
LM95241CIMM-2MINI SOIC8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.78reel
of
1000		ZXTT
T30C
6 weeks1000
LM95241CIMMX-1MINI SOIC8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.78reel
of
3500		ZXTT
T29C
6 weeksN/A
LM95241CIMMXMINI SOIC8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.78reel
of
3500		ZXTT
T28C
6 weeks5000
LM95241CIMMX-2MINI SOIC8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.78reel
of
3500		ZXTT
T30C
16 weeksN/A

General Description

The LM95241 is a precision dual remote diode temperature sensor (RDTS) that uses National's TruTherm technology. The 2-wire serial interface of the LM95241 is compatible with SMBus 2.0. The LM95241 can sense three temperature zones, it can measure the temperature of its own die as well as two diode connected transistors. The LM95241 includes digital filtering and an advanced input stage that includes analog filtering and TruTherm technology that reduces processor-to-processor non-ideality spread. The diode connected transistors can be a "thermal diode" as found in Intel and AMD processors or can simply be a diode connected MMBT3904 transistor. TruTherm technology allows accurate measurement of "thermal diodes" found on small geometry processes such as 90nm and 65nm. The LM95241 supports user selectable thermal diode non-ideality of either Intel processor on 90nm or 65nm process or 2N3904.

The LM95241 resolution format for remote temperature readings can be programmed to be 11-bits signed or unsigned with the digital filtering disabled. When the filtering is enabled the resolution increases to 13-bits signed or unsigned. In the unsigned mode the LM95241 remote diode readings can resolve temperatures above 127°C. Local temperature readings have a resolution of 9-bits plus sign.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM95241CIMMCMOS70184060010890004309006723
LM95241CIMM-1CMOS70184060010890004309006723
LM95241CIMM-2CMOS70184060010890004309006723
LM95241CIMMXCMOS70184060010890004309006723
LM95241CIMMX-1CMOS70184060010890004309006723
LM95241CIMMX-2CMOS70184060010890004309006723

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.


[Information as of 7-Nov-2009]