TMP007 datasheet(10/55 Pages) TI

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( )

k T

2hc

watts / cm / m

l =

V+

AGND

DGND

16-Bit

ADC

Gain

Local

Temperature

Thermopile

Sensor

Voltage

Reference

Digital

Control

and

Math Engine

2C and

SMBus

Compatible

Digital

Interface

ALERT

ADR0

ADR1

SCL

SDA

TMP007

EEPROM

Thot

Tcold

Thot

TMP007

SBOS685C – APRIL 2014 – REVISED JULY 2015

www.ti.com

7 Detailed Description

7.1 Overview

The TMP007 is an integrated digital thermopile temperature sensor in a wafer chip-scale package (WCSP) that

detects the temperature of a remote object by its infrared (IR) emission. It is optimal for thermal management

and thermal protection applications where remote noncontact temperature sensing is desired. The TMP007 is

two-wire and SMBus interface compatible, and is specified over the temperature range of –40°C to 125°C. The

TMP007 contains registers for holding configuration and calibration information, temperature limits, local

temperature, TDIE, measurement results, and the thermopile voltage measurement result. The local temperature

and the thermopile voltage measurements are used by the math engine to calculate the object temperature,

which is then stored in the respective register. In addition, the TMP007 has an internal EPROM memory that can

be used to store the factory default values and custom values for coefficients and calibration parameters. The

values in EPROM can be transferred to the registers either individually or as a complete set.

The SDA (and SCL, if driven by an open-drain output) interface pin requires a pull-up resistor (10 k

Ω, typical) as

part of the communication bus. The ALERT pin is an open-drain output that must also use a pull-up resistor, or

be left floating if unused. If desired, ALERT may be shared with other devices for a wired-OR implementation.

7.2 Functional Block Diagram

7.3 Feature Description

The TMP007 senses the IR radiation that is emitted by all objects. The spectrum of the radiation depends only

on the temperature and is given by Planck’s law, as shown in Equation 1:

where

•

h = Planck’s constant

•

c = speed of light

•

kB = Boltzmann’s constant

•

λ = wavelength in microns

(1)

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