Features Accurately senses die temperature of 3 remote ICs, or diode junctions On-board local temperature sensing SMBus and I2C 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 LM83s on a single bus Description The LM83 is a digital temperature sensor with a 2 wire serial interface that senses the voltage and thus the temperature of three remote diodes using a Delta-Sigma analog-to-digital converter with a digital over-temperature detector. The LM83 accurately senses its own temperature as well as the temperature of three external devices, such as Pentium II® Processors or diode connected 2N3904s. The temperature of any ASIC can be detected using the LM83 as long as a dedicated diode (semiconductor junction) is available on the die. Using the SMBus interface a host can access the LM83'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 four T_HIGH registers. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM83. The sensor powers up with default thresholds of 127°C for T_CRIT and all T_HIGHs. The LM83 is pin for pin and register compatible with the LM84 as well as the Maxim MAX1617 and the 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

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

Datasheets

Title		Size	Date	Other Language
	LM83 3 Diode Input ACPI Compatible Digital Temperature Sensor with Two-Wire Interface	343 Kbytes	28-Jul-00	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
LM83CIMQA/NOPB LM83CIMQA RoHS Status	SSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 161 AVNET-EM Worldwide 1249 DIGI-KEY Worldwide 454 MOUSER Worldwide 190 RS COMPONENTS Worldwide 13 TAYLOR Americas 1144	$2.23 each at 1K+ pcs	rail of 95

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 LM83.

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 LM83 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
LM83CIMQA/NOPB LM83CIMQA	73.053 73.403	SSOP	16	1 1	260 260	Detail	Download	N/A	NSXYTT 83CI 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 LM83.

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 LM83 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 LM83 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM83CIMQA	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 LM83.

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 LM83 is located at RoHS Status.