7 Detailed Description

7.1 Overview

The TMP112 family of devices are digital temperature sensors that are designed for thermal-management

and thermal-protection applications. The TMP112 family is two-wire, SMBus, and I2C interface-compatible. The

device is specified over an operating temperature range of –40°C to 125°C. Figure 7-1 and Figure 7-2 show

block diagrams of the TMP112 family. Figure 7-3 shows the ESD protection circuitries contained in the TMP112

family.

The temperature sensor in the TMP112 family is the chip. 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 TMP112 family is available. The TMP102 device has reduced accuracy, the same

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

Table 7-1. Advantages of TMP112 Family Versus TMP102 and TMP110

DEVICE

COMPATIBLE

INTERFACES

PACKAGE

SUPPLY

CURRENT

(Typ)

SUPPLY

VOLTAGE

(MIN)

SUPPLY

VOLTAGE

(MAX)

RESOLUTION

LOCAL SENSOR

ACCURACY (MAX)

SPECIFIED

CALIBRATION

DRIFT SLOPE

TMP112A/B/

N

I2C

SMBus

SOT563

1.6 × 1.6 × 0.6

4.8µA

(at 4-Hz)

3.2µA

(at 1-Hz)

1.4 V

3.6 V

12 Bit

0.0625°C

±0.5°C: (0°C to 65°C)

±1°C: (-40°C to 125°C)

Yes

TMP112D/D

0/D1/D2/D3

I2C

SMBus

SOT563

1.6 × 1.6 × 0.6

X2SON

0.8 × 0.8 × 0.4

4.8µA

(at 4-Hz)

3.2µA

(at 1-Hz)

1.4 V

3.6 V

12 Bit

0.0625°C

±0.5°C: (-25°C to 85°C)

±1°C: (-40°C to 125°C)

Yes

TMP110

I2C

SMBus

X2SON

0.8 × 0.8 × 0.4

3.2µA

(at 1-Hz)

1.14 V

5.5 V

12 Bit

0.0625°C

±1°C: (-40°C to 125°C)

Yes

TMP102

I2C

SMBus

SOT563

1.6 × 1.6 × 0.6

4.8µA

(at 4-Hz)

3.2µA

(at 1-Hz)

1.4 V

3.6 V

12 Bit

0.0625°C

±2°C: (25°C to 85°C)

±3°C: (-40°C to 125°C)

No

7.2 Functional Block Diagrams

Diode

Temp.

Sensor

DS

A/D

Converter

OSC

Control

Logic

Serial

Interface

Config.

andTemp.

Register

TMP112

Temperature

SCL

1

3

6

4

ALERT

SDA

GND

2

5

V+

ADD0

Figure 7-1. Internal Block Diagram (SOT563-6

Package)

Diode

Temp.

Sensor

A/D

Converter

OSC

Control

Logic

Serial

Interface

Config.

and Temp.

Register

5 V+

1

GND

4 SDA

2

SCL

ALERT/

ADD0

3

TMP112Dx

Figure 7-2. Internal Block Diagram (X2SON-5

Package)

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TMP112, TMP112D

SBOS473L – MARCH 2009 – REVISED JULY 2024

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