Features Accurately senses die temperature of remote ICs or diode junctions Remote diode fault detection On-board local temperature sensing Remote temperature readings: 0.125 °C LSb 10-bits plus sign or 11-bits programmable resolution 11-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 LM95221 is a dual remote diode temperature sensor in an 8-lead MSOP package. The 2-wire serial interface of the LM95221 is compatible with SMBus 2.0. The LM95221 can sense three temperature zones, it can measure the temperature of its own die as well as two diode connected transistors. The diode connected transistors can be a thermal diode as found in Pentium and AMD processors or can simply be a diode connected MMBT3904 transistor. The LM95221 resolution format for remote temperature readings can be programmed to be 10-bits plus sign or 11-bits unsigned. In the unsigned mode the LM95221 remote diode readings can resolve temperatures above 127°C. Local temperature readings have a resolution of 9-bits plus sign. The temperature of any ASIC can be accurately determined using the LM95221 as long as a dedicated diode (semiconductor junction) is available on the target die. The LM95221 remote sensor accuracy of ±1°C is factory trimmed for a series resistance of 2.7 ohms and 1.008 non-ideality factor. Key Specification Local Temperature Accuracy TA=0°C to 85°C ±3.0 °C (max) Remote Diode Temperature Accuracy TA=30°C to 50°C, TD=45°C to 85°C ±1.0 °C (max) TA=0°C to 85°C, TD=25°C to 140°C ±3.0 °C (max) Supply Voltage 3.0 V to 3.6 V Supply Current 2 mA (typ) Applications Processor/Computer System Thermal Management (e.g. Laptop, Desktop, Workstations, Server) Electronic Test Equipment Office Electronics

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

Parameters Values Remote Diode Thermal Sensors 2 Temperature Accuracy (+/-) 1 deg C Supply Min 3 Volt Quiescent Current 2 mA Temperature Min 0 deg C Temperature Max 140 deg C Interface Type 2-Wire Serial Programmable Setpoints No TruTherm(TM) Beta Compensation No Resolution 11 bits Resolution degC/LSB 0.125 Supply Max 3.6 Volt Shut down Yes Fault Queue No

Datasheets

Title		Size	Date	Other Language
	LM95221 Dual Remote Diode Digital Temperature Sensor with SMBus Interface	282 Kbytes	28-May-04	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1727: Application Note 1727 Calibrating the ADC08xxxx Family of Ultra High-Speed Converters	72 Kbytes	6-Mar-08	日本語 中文

Other Technical Documents

Title		Type	Date
	Taking the 'Black Magic' Out of RF Design	External Article	2008-07-01

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM95221CIMM/NOPB LM95221CIMM RoHS Status	MINI SOIC	Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 1000 DIGI-KEY Worldwide 5265 MOUSER Worldwide 1000 TAYLOR Americas 1000	$1.05 each at 1K+ pcs	reel of 1000

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM95221.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM95221 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM95221EVAL	LM95221EVAL Evaluation Board	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	$120.00 each	1
Description: The LM95221 is a dual remote diode temperature sensor and the LM95221EVAL is its evaluation board. Features: Accurately senses die temperature of remote ICs or diode junctions Remote diode fault detection On-board local temperature sensing Remote temperature readings: 0.125 °C LSb 10-bits plus sign or 11-bits programmable resolution 11-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 Contents: Evaluation Board user's guide thank you letter evaluation board license agreement

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM95221CIMM/NOPB LM95221CIMM	29.851 30.002	MINI SOIC	8	1 1	260 260	Detail	Download	N/A	ZXTT T21C

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM95221.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM95221 is located at RoHS Status.

Reference Design

RD-143 - Lowest Power 8-bit 3 GSPS Data Acquisition System

CAD Symbols and Models Download LM95221 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM95221CIMM	CMOS7	0	21301	0	0	1584000	3	449464325

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.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM95221.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM95221 is located at RoHS Status.