SMBDAT

SMBCLK

Temperature

Sensor

Circuitry

Configuration

Register

Temperature

Register

Two-Wire

Serial Interface

2.7V to 5.5V

LM73

Manufacturer's

ID Register

Pointer

Register

and

Decode Logic

Set-Point

Comparator

ADDR

Control/Status

Register

11-Bit to 14-Bit

Delta-Sigma

A/D Converter

GND

ALERT

LM73

SNIS141D – OCTOBER 2005 – REVISED MAY 2009

www.ti.com

DESCRIPTION (CONTINUED)

Available in a 6-pin SOT 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.

Simplified Block Diagram

2

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