TMP461

D+

D-

SCL

SDA

THERM

GND

V+

ALERT /

THERM2

SMBus

Controller

1

2

3

4

6

9

8

7

1.7V to 3.6V

Over-Temperature Shutdown

10

5

A1

A0

RS

(2)

RS

(2)

RS

(2)

RS

(2)

CDIFF

(3)

CDIFF

(3)

Transistor-connected configuration

(1)

Diode-connected configuration

(1)

Series Resistance

0.1µF

10k

(typ)

10k

(typ)

10k

(typ)

10k

(typ)

23

TMP461

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SBOS722B – JUNE 2015 – REVISED AUGUST 2016

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9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The TMP461 device 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 pullup

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

local bypassing. Figure 18 and Figure 19 illustrate the typical configurations for the TMP461 device.

9.2 Typical Application

(1)

The diode-connected configuration provides better settling time. The transistor-connected configuration provides

better series resistance cancellation.

(2)

RS (optional) is < 1 kΩ in most applications. RS is the combined series resistance connected externally to the D+, D-

pins. RS selection depends on the application; see the Filtering section.

(3)

CDIFF (optional) is < 1000 pF in most applications. CDIFF selection depends on the application; see the Filtering

section and Figure 6 (Remote Temperature Error vs Differential Capacitance).

Figure 18. TMP461 Basic Connections Using a Discrete Remote Transistor