TMP411CD datasheet(40/61 Pages) TI2

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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, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The TMP411/TMP411D only requires 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/TMP411D. For V+ ≥ 2.7V as

shown in Figure 9-1, TMP411/TMP411D 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

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

TMP411D

D+

D–

SCL

SDA

GND

V+

Processor or ASIC

SMBus

Controller

2.7V to 5.5V

Fixed

IH/VIL

Built-In Thermal

Transistor, Diode

Overtemperature

Shutdown

THERM

THERM2

ALERT /

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

Application while V+ ≥ 2.7V)

TMP411D

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

IH/VIL: 0.7/0.3 V+

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

V+ < 2.7V)

TMP411, TMP411D

SBOS383E – DECEMBER 2006 – REVISED JULY 2025

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