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 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. 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 Voltage 3.0 V to 3.6 V Average Supply Current 471 µA (typ) Applications • Processor/Computer System Thermal Management (e.g. Laptop, Desktop, Workstations, Server) • Electronic Test Equipment • Office Electronics

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Typical Application *click for larger image	Block Diagram *click for larger image
Typical Performance click for larger image

Datasheet

Title		Size	Date	Other Language
	LM95241 Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm™ Technology (65nm/90nm)	722 Kbytes	23-Sep-06

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Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM95241CIMM	CMOS7	0	18406	0	0	1089000	4	309006723
LM95241CIMM-1	CMOS7	0	18406	0	0	1089000	4	309006723
LM95241CIMM-2	CMOS7	0	18406	0	0	1089000	4	309006723
LM95241CIMMX	CMOS7	0	18406	0	0	1089000	4	309006723
LM95241CIMMX-1	CMOS7	0	18406	0	0	1089000	4	309006723
LM95241CIMMX-2	CMOS7	0	18406	0	0	1089000	4	309006723

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.

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