Features • SensorPath Interface • 2 hardware programmable addresses • 2 remote diode temperature sensor zones • Internal local temperature zone • 0.5 °C resolution • Measures temperatures up to 140 °C • 14-lead TSSOP package Description The LM32 is a digital temperature sensor that measures 3 temperature zones and has a single-wire interface compatible with National Semiconductor's SensorPath bus. SensorPath data is pulse width encoded, thereby allowing the LM32 to be easily connected to many general purpose micro-controllers. Several National Semiconductor Super I/O products include a fully integrated SensorPath master, that when connected to an LM32 can realize a hardware monitor function that includes limit checking for measured values, autonomous fan speed control and many other functions. The LM32 measures the temperature of its own die as well as two external devices such as a processor thermal diode or a diode connected transistor. The LM32 can resolve temperatures up to 255°C and down to -256°C. The operating temperature range of the LM32 is 0°C to +125°C. The address programming pin allows two LM32s to be placed on one SensorPath bus. Key Specification Temperature Sensor Accuracy ±3 °C (max) Temperature Range:   LM32 junction 0 °C to +85 °C Remote Temp Accuracy 0 °C to +100 °C Power Supply Voltage +3.0 V to +3.6 V Average Power Supply Current 0.5 mA (typ) Conversion Time (all Channels) 22.5ms to 1456ms Applications • Microprocessor based equipment (Motherboards, Video Cards, Base-stations, Routers, ATMs, Point of Sale, ...) • Power Supplies

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Datasheet

Title		Size	Date	Other Language
	LM32 Dual Thermal Diode Temperature Sensor with SensorPath™ Bus	340 Kbytes	24-May-04

Featured Application Notes

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Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM32CIMT/NOPB RoHS	TSSOP	Lifetime buy Lead Time: 8 weeks	Distributor Region Qty DIGIKEY Worldwide 249 FARNELL Europe and Asia 114	$1.30 each at 1K+ pcs	rail of 94
LM32CIMTX/NOPB LM32CIMTX RoHS	TSSOP	Lifetime buy Lead Time: 8 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$1.30 each at 1K+ pcs	reel of 2500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM32CIMT	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM32CIMTX	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM32CIMT	CMOS7	0	18406	0	0	1089000	4	309006723
LM32CIMTX	CMOS7	0	18406	0	0	1089000	4	309006723

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.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM32CIMT	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM32CIMTX	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009