Features Accurately senses die temperature of 2 remote ICs or diode junctions and local temperature TruTherm BJT beta compensation technology accurately senses sub-micron process thermal diodes 0.125°C LSb temperature resolution 0.03125°C LSb remote temperature resolution with digital filter enabled +127.875°C/–128°C and 0°C/255°C remote ranges Programmable digital filters and analog front end filter Remote diode fault detection, model selection and offset correction Mask and status register support 3 programmable ^TCRIT outputs with programmable shared hysteresis Programmable conversion rate and shutdown mode one-shot conversion control SMBus 2.0 compatible interface, supports TIMEOUT Three-level address pin 14-pin LLP package Description LM95233 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) interface that can monitor the temperature of two remote diodes as well as its own temperature. The LM95233 can be used to very accurately monitor the temperature of up to two external devices such as microprocessors, graphics processors or diode-connected 2N3904s. The LM95233's TruTherm BJT beta compensation technology allows sensing of 90nm or 65nm process thermal diodes accurately. The LM95233 reports temperature in two different formats for +127.875°C/–128°C range and 0°C/255°C range. The LM95233 ^TCRIT1, ^TCRIT2 and ^TCRIT3 outputs are triggered when any unmasked channel exceeds its corresponding programmable limit and can be used to shutdown the system, to turn on the system fans or as a microcontroller interrupt function. The current status of the ^TCRIT1, ^TCRIT2 and ^TCRIT3 pins can be read back from the status registers. Mask registers are available for further control of the ^TCRIT outputs. LM95233's remote temperature channels have programmable digital filters to minimize unwanted ^TCRIT events when temperature spikes are encountered. For optimum flexibility and accuracy each LM95233 channel includes, registers for sub-micron process or 2N3904 diode model selection as well as offset correction. A three level address pin allows connection of up to 3 LM95233s to the same SMBus master. The LM95233 includes power saving functions such as: programmable conversion rate, shutdown mode, and turn off of unused channels. Key Specification ■  Local Temperature Accuracy ±2.0 °C (max) ■  Remote Diode Temperature Accuracy ±0.875 °C (max) ■  Supply Voltage 3.0 V to 3.6 V ■  Average Supply Current (1Hz conversion rate) 0.57 mA (typ) Applications Processor/Computer System Thermal Management   (e.g. Laptop, Desktop, Workstations, Server) Electronic Test Equipment Office Electronics

Also Recommended LM95234▲ Quad Remote Diode Sensor With TruTherm(TM) Beta Compesation LM95233 Typical Application

Typical Application click for larger image LM95233 Typical Application	Block Diagram click for larger image
Typical Performance *click for larger image Thermal Diode Performance Comparison

Parameters / Values	LM95233	LM95234
Remote Diode Thermal Sensors	2	4
Temperature Accuracy (+/-)	0.875 deg C	0.875 deg C
Supply Min	3.0 Volt	3.0 Volt
Quiescent Current	0.57 mA	0.57 mA
Temperature Min	-40 deg C	-40 deg C
Temperature Max	140 deg C	140 deg C
Interface Type	2-Wire Serial	2-Wire Serial
Programmable Setpoints	Yes	Yes
TruTherm(TM) Beta Compensation	Yes	Yes
Resolution	13 bits	13 bits
Resolution degC/LSB	0.03125	0.03125
Supply Max	3.6 Volt	3.6 Volt
Shut down	Yes	Yes
Interrupt Outputs	3	3
Fault Queue	No	Yes
Automotive	Yes	Yes
PowerWise	Yes	Yes

Datasheets

Title		Size	Date	Other Language
	LM95233 Dual Remote Diode and Local Temperature Sensor with SMBus Interface and TruTherm? Technology	797 Kbytes	4-Apr-11

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM95233CISD/NOPB LM95233CISD RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 2855 DIGI-KEY Worldwide 0 FARNELL Europe and Asia 1118 MOUSER Worldwide 974 TECHMOSA Asia Pacific 1000	$1.00 each at 1K+ pcs	reel of 1000
LM95233CISDX/NOPB LM95233CISDX RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.00 each at 1K+ pcs	reel of 4500

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 LM95233.

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 LM95233 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM95233EB/NOPB	Dual Remote Diode and Local Temperature Sensor with SMBus Interface and TruThermTM Technology from the PowerWise® Family	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0	$140.00 each	1
Description: The LM95233EB features an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) interface that can very accurately monitor the temperatue of two remote diodes as well as its own temperature that includes TruThermTM BJT beta compensation technology. The LM95233EB is designed to ease the evaluation and design-in of National Semiconductors LM95233 remote diode and local digital temperature sensor. The LM95233EB board connects via USB to a PC and is controlled by the SensorEval software, which is included with the board. SensorEval software allows easy access and control of the LM95233's registers. The LM95233EB board is powered through the USB connection and no other external power sources are required. Features: Accurately senses die temperature of 2 remote ICs or diode junctions and local temperature TruTherm BJT beta compensation technology accurately senses sub-micron process thermal diodes 0.125°C LSB temperature resolution 0.03125°C LSB remote temperature resolution with digital filter enabled +127.875°C/-128°C and 0°C/255°C remote ranges Programmable digital filters and analog front end filter Remote diode fault detection, model selection, and offset correction Mask and status register support 3 programmable TCRIT outputs with programmable hysteresis SMBus 2.0 compatible interface, supports TIMEOUT Programmable conversion rate and shutdown mode one-shot conversion control Three-level address pin 14-pin LLP package Contents: Fully assembled LM95233 Evaluation Board SensorEval Software CD LM95233 Evaluation Board User's Guide

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
LM95233CISD/NOPB LM95233CISD	40.451 40.603	LLP	14	1 1	260 260	Detail	Download	N/A	NS UZXYTT 95233CI
LM95233CISDX/NOPB LM95233CISDX	40.451 40.603	LLP	14	1 1	260 260	Detail	Download	N/A	NS UZXYTT 95233CI

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 LM95233.

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 LM95233 is located at RoHS Status.

CAD Symbols and Models Download LM95233 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM95233CISD	CMOS7	0	21301	0	0	1584000	3	449464325
LM95233CISDX	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 LM95233.

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 LM95233 is located at RoHS Status.