D+

D

SCL

SDA

THERM

GND

V+

ALERT / THERM2

SMBus

Controller

1

2

3

4

5

8

7

6

TMP451

1.7 V to 3.6 V

1.7 V to 3.6 V

Overtemperature Shutdown

(2)

(2)

(2)

(2)

0.1 µF

10 k

(typ)

10 k

(typ)

10 k

(typ)

10 k

(typ)

(3)

(3)

Transistor-connected configuration

(1)

Diode-connected configuration

(1)

Series Resistance

TMP451

www.ti.com

SBOS686 – JUNE 2013

APPLICATION INFORMATION

The TMP451 is a digital temperature sensor that combines a local temperature measurement channel and a

remote-junction temperature measurement channel in a single DFN-8 package. The device is two-wire- and

SMBus-interface compatible, and is specified over a temperature range of –40°C to +125°C. The TMP451 also

contains multiple registers for programming and holding configuration settings, temperature limits, and

temperature measurement results.

The TMP451 requires only a transistor connected between the D+ and D– pins for remote temperature

measurement. Tie the D+ pin to GND if the remote channel is not used and only the local temperature is

measured. The SDA, ALERT, and THERM pins (and SCL, if driven by an open-drain output) require pull-up

resistors as part of the communication bus. A 0.1-µF power-supply decoupling capacitor is recommended for

local bypassing. Figure 11 shows the typical configuration for the TMP451.

(1) Diode-connected configuration provides better settling time. Transistor-connected configuration provides better series resistance

cancellation.

Figure 5, Remote Temperature Error vs Differential Capacitance.

Figure 11. TMP451 Basic Connections

Copyright © 2013, Texas Instruments Incorporated

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