LM73 - 2.7V, SOT-23, 11- to 14- Bit Digital Temperature Sensor with 2-Wire Interface

LM73 - 2.7V, SOT-23, 11- to 14- Bit Digital Temperature Sensor with 2-Wire Interface from the PowerWise® Family

Datasheet	Packaging	Samples & Pricing	Eval. Boards	Reliability	Application Notes	Knowledge Base

Features

•	Single address pin offers choice of three selectable addresses per version for a total of six possible addresses.
•	SMBus and I 2C-compatible two-wire interface
•	Supports 400 kHz operation
•	Shutdown mode with one-shot feature available for very low average power consumption
•	Programmable digital temperature resolution from 11 bits to 14 bits.
•	Fast conversion rate ideal for quick power up and measuring rapidly changing temperature
•	Open-drain ^ALERT output pin goes active when temperature is above a programmed temperature limit
•	Very stable, low-noise digital ouput.
•	UL Recognized Component

Key Specification

■ Supply Voltage		2.7V to 5.5V
■ Supply Current	operating	320 µA (typ)
	operating	495 µA (max)
	shutdown	8 µA (max)
	shutdown		1.9 µA (typ)
■ Temperature	−10°C to 80°C	±1.0°C (max)
Accuracy	−25°C to 115°C	±1.5°C (max)
	−40°C to 150°C	±2.0°C (max)
■ Resolution		0.25°C to 0.03125°C
■ Conversion Time	11-bit (0.25°C)	14 ms (max)
■ Conversion Time	14-bit (0.03125°C)	112 ms (max)

General Description

The LM73 is an integrated, digital-output temperature sensor featuring an incremental Delta-Sigma ADC with a two-wire interface that is compatible with the SMBus and I 2C® interfaces. More...

Applications

•	Portable Electronics
•	Notebook Computers
•	Automotive
•	System Thermal Management
•	Office Electronics

Typical Application

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Parameters Values

Temperature Accuracy (+/-) 1 deg C

Supply Min 2.7 Volt

Quiescent Current 0.495 mA

Temperature Min -40 deg C

Temperature Max 150 deg C

Interface Type 2-Wire Serial

Programmable Setpoints Yes

Resolution 14 bits

Resolution degC/LSB 0.03125

Supply Max 5.5 Volt

Shut down Yes

Interrupt Outputs 1

Fault Queue No

Automotive Yes

PowerWise Yes

Typical Performance

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Additional Resources

Application Notes

Block Diagram

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Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM73 2.7V, SOT-23, 11-to-14 Bit Digital Temperature Sensor with 2-Wire Interface	442 Kbytes	13-May-09	Download

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Weeks

Qty

$US each

LM73CIMK-0

TSOT

NOPB

260

RoHS

Download

Full production

N/A

1K+

$0.53

reel
of
1000

T730
XTT

6 weeks

N/A

LM73CIMK-1

TSOT

NOPB

260

RoHS

Download

Full production

N/A

1K+

$0.53

reel
of
1000

T731
XTT

6 weeks

N/A

LM73CIMKX-0

TSOT

NOPB

260

RoHS

Download

Full production

N/A

1K+

$0.53

reel
of
3000

T730
XTT

6 weeks

N/A

LM73CIMKX-1

TSOT

NOPB

260

RoHS

Download

Full production

N/A

1K+

$0.53

reel
of
3000

T731
XTT

16 weeks

N/A

LM73EVAL

LM73EVAL Evaluation Board

Full production

N/A

$63.50

8 weeks

N/A

General Description

The LM73 is an integrated, digital-output temperature sensor featuring an incremental Delta-Sigma ADC with a two-wire interface that is compatible with the SMBus and I 2C® interfaces. The host can query the LM73 at any time to read temperature. Available in a 6-pin SOT-23 package, the LM73 occupies very little board area while operating over a wide temperature range (-40°C to 150°C) and providing ±1.0°C accuracy from -10°C to 80°C. The user can optimize between the conversion time and the sensitivity of the LM73 by programming it to report temperature in any of four different resolutions. Defaulting to 11-bit mode (0.25°C/LSB), the LM73 measures temperature in a maximum time of 14 ms, making it ideal for applications that require temperature data very soon after power-up. In its maximum resolution, 14-bit mode (0.03125°C/LSB), the LM73 is optimized to sense very small changes in temperature.

A single multi-level address line selects one of three unique device addresses. An open-drain ^ALERT output goes active when the temperature exceeds a programmable limit. Both the data and clock lines are filtered for excellent noise tolerance and reliable communication. Additionally, a time-out feature on the clock and data lines causes the LM73 to automatically reset these lines if either is held low for an extended time, thus exiting any bus lock-up condition without processor intervention.

Reliability Metrics

Part Number	Process	EFR Sample Size	LTA Device Hours	FITS	MTTF (Hours)
LM73CIMK-0	CMOS7	18406	1089000	4	309006723
LM73CIMK-1	CMOS7	18406	1089000	4	309006723
LM73CIMKX-0	CMOS7	18406	1089000	4	309006723
LM73CIMKX-1	CMOS7	18406	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.

More Application Notes

Title	Size in Kbytes	Date
AN-1155: Application Note 1155 A Simple Software I2C Routine for the COP8	82 Kbytes	15-May-04	Download
AN-1256: Application Note 1256 Tiny Temperature Sensors for Portable Systems	66 Kbytes	1-Oct-02	Download

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[Information as of 7-Nov-2009]