Features Directly senses die temperature of remote ICs Senses temperature of remote diodes SMBus compatible interface, supports SMBus Timeout Register readback capability 7 bit plus sign temperature data format 2 address select lines enable 9 LM84s to be connected to a single bus Description The LM84 is a remote diode temperature sensor, Delta-Sigma analog-to-digital converter, and digital over-temperature detector with an SMBus™ interface. The LM84 senses its own temperature as well as the temperature of a target IC with a diode junction, such as a Pentium® II processor or a diode connected 2N3904. A diode junction (semiconductor junction) is required on the target IC's die. A host can query the LM84 at any time to read the temperature of this diode as well as the temperature state of the LM84 itself. A T_CRIT_A# interrupt output becomes active when the temperature is greater than a programmable comparator limit, T_CRIT. The host can program as well as read back the state of the T_CRIT register. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM84. The sensor powers up with default thresholds of 127°C for T_CRIT. Key Specification Supply Voltage 3.0V - 3.6V Supply Current 1 mA (max) Local Temperature Accuracy ±1.0°C (typ) Remote Diode Temperature Accuracy   +60°C to +100°C ±3°C (max) 0°C to +125°C ±5°C (max) Applications System Thermal Management Personal Computers Electronic Test Equipment Office Electronics HVAC

Also Recommended LM95213▲ Dual Remote Diode Input LM95214▲ Quad Remote Diode Input LM95233▲ Dual Channel With TruTherm Support LM95234▲ Quad Channel With TruTherm Support LM95235▲ Smaller Package With TruTherm Support

Datasheets

Title		Size	Date	Other Language
	LM84 Diode Input Digital Temperature Sensor with Two-Wire Interface	168 Kbytes	2-Mar-01	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1155: Application Note 1155 A Simple Software I2C Routine for the COP8	82 Kbytes	15-May-04

Other Technical Documents

Title		Type	Date
	Sensing and Monitoring for Control and Protection Seminar	App Note	2003-02-17
	Multiple Remote Diode Temperature Sensing	App Note	2003-02-17

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM84BIMQA/NOPB LM84BIMQA RoHS Status	SSOP	Full production Lead Time: 12 weeks	Distributor Region Qty ARROW Worldwide 1506 AVNET-EM Worldwide 316 DIGI-KEY Worldwide 0 MOUSER Worldwide 35 TAYLOR Americas 1506	$1.61 each at 1K+ pcs	rail of 95
LM84BIMQAX/NOPB LM84BIMQAX RoHS Status	SSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 27500 AVNET-EM Worldwide 2500 DIGI-KEY Worldwide 0 TAYLOR Americas 27500	$1.61 each at 1K+ pcs	reel of 2500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM84CIMQA	NONE	NONE	04 Mar 2003
LM84CIMQAX	NONE	NONE	04 Mar 2003

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 LM84.

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 LM84 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
LM84BIMQA/NOPB LM84BIMQA	73.053 73.403	SSOP	16	1 1	260 260	Detail	Download	N/A	NSXYTT 84BI MQA
LM84BIMQAX/NOPB LM84BIMQAX	73.053 73.403	SSOP	16	1 1	260 260	Detail	Download	N/A	NSXYTT 84BI 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 LM84.

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 LM84 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 LM84 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM84BIMQA	CS065	2	47473	43	0	5527000	1	1568301341
LM84BIMQAX	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 LM84.

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 LM84 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM84CIMQA	NONE	NONE	04 Mar 2003
LM84CIMQAX	NONE	NONE	04 Mar 2003