LM73

SMBDAT

SMBCLK

ADDR

1

5

6

4

Typical bypass 0.1 PF

3

2

To hardware

shutdown

To / from processor

2-wire interface

Address (set as desired for one

of three addresses)

ALERT

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LM73

SNIS141F – OCTOBER 2005 – REVISED OCTOBER 2015

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

1 Features

3 Description

The LM73 is an integrated, digital-output temperature

1

•

Single Address Pin Offers Choice of Three

sensor featuring an incremental Delta-Sigma ADC

Selectable Addresses Per Version for a Total of

with a two-wire interface that is compatible with the

Six Possible Addresses.

•

LM73 at any time to read temperature.

•

Supports 400-Khz Operation

Available in a 6-pin SOT package, the LM73 occupies

•

Shutdown Mode With One-shot Feature Available

very little board area while operating over a wide

for Very Low Average Power Consumption

temperature range (–40°C to 150°C) and providing

±1°C accuracy from –10°C to 80°C. The user can

•

Programmable Digital Temperature Resolution

optimize between the conversion time and the

From 11 Bits to 14 Bits

sensitivity of the LM73 by programming it to report

•

Fast Conversion Rate Ideal for Quick Power Up

temperature in any of four different resolutions.

and Measuring Rapidly Changing Temperature

Defaulting to 11-bit mode (0.25°C/LSB), the LM73

•

Open-Drain ALERT Output Pin Goes Active When

measures temperature in a maximum time of 14 ms,

making

it

ideal

for

applications

that

require

Temperature is Above a Programmed

temperature data very soon after power-up. In its

Temperature Limit

maximum resolution, 14-bit mode (0.03125°C/LSB),

•

Very Stable, Low-noise Digital Output

the LM73 is optimized to sense very small changes in

•

UL Recognized Component

temperature.

•

Key Specifications

A single multi-level address line selects one of three

–

Supply Current

unique device addresses. An open-drain ALERT

output goes active when the temperature exceeds a

–

Operating

programmable limit. Both the data and clock lines are

–

320 µA (Typical)

filtered for excellent noise tolerance and reliable

–

495 µA (Maximum)

communication. Additionally, a time-out feature on the

–

Shutdown

clock

and

data

lines

causes

the

LM73

to

automatically reset these lines if either is held low for

–

8 µA (Maximum)

an extended time, thus exiting any bus lock-up

–

1.9 µA (Typical)

condition without processor intervention.

–

Temperature Accuracy

Device Information(1)

–

−10°C to 80°C: ±1.0°C (Maximum)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

–

−25°C to 115°C: ±1.5°C (Maximum)

LM73

SOT (6)

2.90 mm × 1.60 mm

–

−40°C to 150°C: ±2°C (Maximum)

(1) For all available packages, see the orderable addendum at

–

Resolution

the end of the datasheet.

–

0.25°C to 0.03125°C

Typical Application

–

Conversion Time

–

11-Bit (0.25°C): 14 ms (Maximum)

–

14-Bit (0.03125°C): 112 ms (Maximum)

2 Applications

•

Portable Electronics

•

Notebook Computers

•

Automotive

•

System Thermal Management

•

Office Electronics

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.