Features Accurately senses die temperature of remote ICs, or diode junctions On-board local temperature sensing SMBus and I 2C compatible interface, supports SMBus 1.1 TIMEOUT Two interrupt outputs: ^INT and ^T_CRIT_A Register readback capability 7 bit plus sign temperature data format, 1 °C resolution 2 address select pins allow connection of 9 LM82s on a single bus Description The LM82 is a digital temperature sensor with a 2 wire serial interface that senses the voltage and thus the temperature of a remote diode using a Delta-Sigma analog-to-digital converter with a digital over-temperature detector. The LM82 accurately senses its own temperature as well as the temperature of external devices, such as Pentium II ™ Processors or diode connected 2N3904s. The temperature of any ASIC can be detected using the LM82 as long as a dedicated diode (semiconductor junction) is available on the die. Using the SMBus interface a host can access the LM82's registers at any time. Activation of a ^T_CRIT_A output occurs when any temperature is greater than a programmable comparator limit, T_CRIT. Activation of an ^INT output occurs when any temperature is greater than its corresponding programmable comparator HIGH limit. The host can program as well as read back the state of the T_CRIT register and the 2 T_HIGH registers. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM82. The sensor powers up with default thresholds of 127°C for T_CRIT and all T_HIGHs. The LM82 is pin for pin and register compatible with the LM84, Maxim MAX1617 and Analog Devices ADM1021. Key Specification ■  Supply Voltage 3.0V to 3.6V ■  Supply Current 0.8mA (max) ■  Local Temp Accuracy (includes quantization error) 0°C to +85°C ±3.0°C (max) ■  Remote Diode Temp Accuracy (includes quantization    error) +25°C to +100°C ±3°C (max) 0°C to +125°C ±4°C (max) Applications System Thermal Management Computers Electronic Test Equipment Office Electronics HVAC

Also Recommended LM95213▲ Dual Remote Diode Sensor LM95214▲ Quad Remote Diode Sensor LM95235▲ Smaller Package Part With TruTherm(TM) Support

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

Datasheets

Title		Size	Date	Other Language
	LM82 Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface	461 Kbytes	13-Jul-10	日本語

Other Technical Documents

Title		Type	Date
	Multiple Remote Diode Temperature Sensing	App Note	2003-02-17

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM82CIMQA/NOPB LM82CIMQA RoHS Status	SSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 224 AVNET-EM Worldwide 145 DIGI-KEY Worldwide 279 FARNELL Europe and Asia 4 MOUSER Worldwide 160 NEWARK Americas 142 TAYLOR Americas 1364	$1.93 each at 1K+ pcs	rail of 95
LM82CIMQAX/NOPB RoHS Status	SSOP	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 2500 DIGI-KEY Worldwide 0	$1.93 each at 1K+ pcs	reel of 2500

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 LM82.

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 LM82 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM82CIMQA/NOPB LM82CIMQA	73.053 73.403	SSOP	16	1 1	260 260	Detail	Download	ibis file	NSXYTT 82CI MQA
LM82CIMQAX/NOPB	73.053 73.403	SSOP	16	1	260	Detail	Download	ibis file	NSXYTT 82CI MQA

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 LM82.

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 LM82 is located at RoHS Status.

Design Tools

Title	Size	Date
LMxx - Windows 95/98 VXD drivers with stand alone application for talking to temperature sensors or hardware monitors on a mother board

CAD Symbols and Models Download LM82 CAD Symbols

Models ibis file

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM82CIMQA	CS065	2	47473	43	0	5527000	1	1568301341
LM82CIMQAX	CS065	2	47473	43	0	5527000	1	1568301341

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 LM82.

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 LM82 is located at RoHS Status.