Diode

Temp.

Sensor

DS

A/D

Converter

OSC

Control

Logic

Serial

Interface

Config.

andTemp.

Register

Temperature

SCL

1

3

6

4

ALERT

SDA

GND

2

5

V+

ADD0

TMP102

www.ti.com

SBOS397F – AUGUST 2007 – REVISED DECEMBER 2015

7 Detailed Description

7.1 Overview

The TMP102 device is a digital temperature sensor that is optimal for thermal-management and thermal-

specified over an operating temperature range of –40°C to 125°C. See Functional Block Diagram for a block

diagram of the TMP102 device.

The temperature sensor in the TMP102 device is the chip itself. Thermal paths run through the package leads as

well as the plastic package. The package leads provide the primary thermal path because of the lower thermal

resistance of the metal.

An alternative version of the TMP102 device is available. The TMP112 device has highest accuracy, the same

micro-package, and is pin-to-pin compatible.

Table 1. Advantages of TMP112 versus TMP102

SUPPLY

SUPPLY

SPECIFIED

COMPATIBLE

SUPPLY

LOCAL SENSOR ACCURACY

DEVICE

PACKAGE

VOLTAGE

VOLTAGE

RESOLUTION

CALIBRATION

INTERFACES

CURRENT

(MAX)

(MIN)

(MAX)

DRIFT SLOPE

SOT563

12 bit

0.5°C: (0°C to 65°C)

I

TMP112

10 µA

1.4 V

3.6 V

Yes

1.2 × 1.6 × 0.6

0.0625°C

1°C: (-40°C to 125°C)

SMBus

SOT563

12 bit

2°C: (25°C to 85°C)

I

TMP102

10 µA

1.4 V

3.6 V

No

1.2 × 1.6 × 0.6

0.0625°C

3°C: (-40°C to 125°C)

SMBus

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Digital Temperature Output

The digital output from each temperature measurement is stored in the read-only temperature register. The

temperature register of the TMP102 device is configured as a 12-bit, read-only register (configuration register EM

bit = 0, see the Extended Mode (EM) section), or as a 13-bit, read-only register (configuration register EM bit = 1)

that stores the output of the most recent conversion. Two bytes must be read to obtain data and are listed in

Table 8 and Table 9. Byte 1 is the most significant byte (MSB), followed by byte 2, the least significant byte

(LSB). The first 12 bits (13 bits in extended mode) are used to indicate temperature. The least significant byte

does not have to be read if that information is not needed. The data format for temperature is summarized in

Table 2 and Table 3. One LSB equals 0.0625°C. Negative numbers are represented in binary twos-complement

format. Following power-up or reset, the temperature register reads 0°C until the first conversion is complete. Bit

D0 of byte 2 indicates normal mode (EM bit = 0) or extended mode (EM bit = 1) , and can be used to distinguish

between the two temperature register data formats. The unused bits in the temperature register always read 0.

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