LM73

SMBDAT

SMBCLK

ADDR

1

5

6

4

VDD = 2.7V to 5.5V

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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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.

LM73-Q1

SNIS194 – DECEMBER 2016

LM73-Q1 2.7-V, SOT-23, 11- to 14-Bit Digital Temperature Sensor With 2-Wire Interface

1

1 Features

1

•

Qualified for Automotive Applications

•

AEC-Q100 Qualified With the Following Results

–

LM73-Q1 Temperature grade 1: –40°C to

125°C

–

LM73-Q1 HBM ESD Classification Level 2

–

LM73-Q1 CDM ESD Classification Level C6

•

Single Address Pin Offers Choice of Three

Selectable Addresses Per Version for a Total of

Six Possible Addresses.

•

SMBus and I2C-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 Output

•

UL Recognized Component

•

Temperature Accuracy: ±1.45°C (Maximum)

•

Temperature Range: –40°C to 125°C

•

Conversion Time

–

11-Bit (0.25°C): 14 ms (Maximum)

–

14-Bit (0.03125°C): 112 ms (Maximum)

•

Operating Supply Current: 320 µA (Typical)

•

Shutdown Supply Current: 1.9 µA (Typical)

•

Resolution: 0.25°C to 0.03125°C

2 Applications

•

Automotive Climate Control

•

Advanced Driver Assistance Systems (ADAS)

•

Airflow Sensor

•

Infotainment Processor Management

•

Instrument Cluster Control

•

UREA Sensors

•

HID Lamps

3 Description

The LM73-Q1 is a digital output temperature sensor

featuring

an

integrated

incremental

Delta-Sigma

ADC. The LM73-Q1 communicates with a two-wire

interface that is compatible with SMBus and I2C

interfaces, and the host can query the LM73-Q1 at

any time to read temperature.

The LM73-Q1 operates over a wide temperature

range (–40°C to 125°C) and provides ±1.45°C

accuracy from –10°C to 80°C. The LM73-Q1 includes

four selectable resolution options that allow the

temperature conversion time and sensitivity to be

adjusted for optimal performance. The LM73-Q1

defaults to 11-bit mode (0.25°C/LSB), and will

measure temperature in a maximum time of 14 ms,

making

it

ideal

for

applications

that

require

temperature data very soon after power-up. In its 14-

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

LM73-Q1 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, the LM73-Q1 has a

time-out feature that will automatically reset the clock

and data lines, if these lines are held low for an

extended period of time. This prevents a bus lock-up

condition

without

requiring

host

processor

intervention.

Device Information(1)

PART NUMBER

PACKAG

E

BODY SIZE (NOM)

LM73-Q1

SOT (6)

2.90 mm × 1.60 mm

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

the end of the datasheet.

Simplified Schematic