TMP411 datasheet(40/60 Pages) TI2

40 / 60 page

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, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The TMP411-Q1 and TMP411D-Q1 only require a transistor connected between the D+ and D– pins for remote

temperature measurement. Tie the D+ pin to D- 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. TI recommends using a 0.1µF power-supply decoupling capacitor for

local bypassing. Figure 9-1 illustrates the typical configurations for the TMP411-Q1 and TMP411D-Q1. For V+

≥ 2.7V as shown in Figure 9-1, TMP411-Q1 and TMP411D-Q1 digital pins (4, 6, 7, and 8) can be connected to

a separate I2C pullup and supply voltage due to fixed logic input voltages. However, for V+ < 2.7V as shown in

Figure 9-2, TMP411D-Q1 digital pins (SCL, SDA) must be connected to an equal I2C pullup and supply voltage

due to ratiometric logic input voltages (30%/70% of V+ pin).

TMP411-Q1

TMP411D-Q1

D+

D–

SCL

SDA

GND

V+

Processor or ASIC

SMBus

Controller

2.7V to 5.5V

Fixed

VIH/VIL

Built-In Thermal

Transistor, Diode

Overtemperature

Shutdown

THERM

THERM2

ALERT /

Figure 9-1. TMP411-Q1 and TMP411D-Q1 Simplified Block Diagram (Separate I2C Pullup and Supply

Voltage Application While V+ ≥ 2.7V)

TMP411D-Q1

D+

D–

SCL

SDA

GND

V+

Processor or ASIC

SMBus

Controller

Built-In Thermal

Transistor, Diode

Overtemperature

Shutdown

THERM

THERM2

ALERT /

1.62V to 2.7V

VIH/VIL: 0.7/0.3 V+

Figure 9-2. TMP411D-Q1 Simplified Block Diagram (Equal I2C Pullup and Supply Voltage Application

While V+ < 2.7V)

TMP411-Q1, TMP411D-Q1

SBOS527G – DECEMBER 2010 – REVISED SEPTEMBER 2025

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Product Folder Links: TMP411-Q1 TMP411D-Q1

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