SMBDAT

SMBCLK

Temperature

Sensor

Circuitry

Configuration

Register

Temperature

Register

Two-Wire

Serial Interface

2.7V to 5.5V

LM73

Manufacturer's

ID Register

THIGH Register

TLOW Register

Pointer

Register

and

Decode Logic

Set-Point

Comparator

ADDR

Control/Status

Register

11-Bit to 14-Bit

Delta-Sigma

A/D Converter

GND

VDD

ALERT

9

LM73-Q1

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SNIS194 – DECEMBER 2016

Product Folder Links: LM73-Q1

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7 Detailed Description

7.1 Overview

The LM73-Q1 is a digital temperature sensor that senses the temperature of its die using a sigma-delta analog-

to-digital converter and stores the temperature in the Temperature Register. The LM73-Q1's 2-wire serial

interface is compatible with SMBus 2.0 and I2C. Please see the SMBus 2.0 specification for a detailed

description of the differences between the I2C bus and SMBus.

The temperature resolution is programmable, allowing the host system to select the optimal configuration

between sensitivity and conversion time. The LM73-Q1 can be placed in shutdown to minimize power

consumption when temperature data is not required. While in shutdown, a 1-shot conversion mode allows

system control of the conversion rate for ultimate flexibility.

7.2 Functional Block Diagram

7.3 Feature Description

The LM73-Q1 features the following registers. See LM73-Q1 Registers for a complete list of the pointer address,

content, and reset state of each register.

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Pointer Register