TMP411 datasheet(10/48 Pages) TI2

10 / 48 page

0.1µF

TMP411

D+

V+

CDIFF

GND

SCL

SDA

ALERT/THERM2

THERM

+5V

SMBus

Controller

Fan Controller

Diode

íconnected configuration

Series Resistance

Transistor

íconnected configuration

(2)

(3)

(1)

(3)

(2)

(1):

10 k

(typ)

10 k

(typ)

10 k

(typ)

10 k

(typ)

TMP411

SBOS383D – DECEMBER 2006 – REVISED DECEMBER 2016

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Product Folder Links: TMP411

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9 Detailed Description

9.1 Overview

The TMP411 is a dual-channel digital temperature sensor that combines a local die-temperature measurement

channel in a single VSSOP-8 or SOIC-8 package. The TMP411 is two-wire and SMBus interface-compatible and

is specified over a temperature range of –40°C to +125°C. The TMP411 device contains multiple registers for

holding configuration information, temperature measurement results, temperature comparator maximum and

minimum limits, and status information.

User-programmed high and low temperature limits stored in the TMP411 triggers an overtemperature or

undertemperature alarm (ALERT) on local and remote temperatures. Additional thermal limits can be

programmed into the TMP411 and can trigger another flag (THERM) that initiates a system response to rising

temperatures.

The TMP411 requires only a transistor connected between D+ and D– for proper remote temperature sensing

operation. The SCL and SDA interface pins require pullup resistors as part of the communication bus, while

ALERT and THERM pins are open-drain outputs that require pullup resistors. ALERT and THERM pins can be

shared with other devices for a wired-OR implementation, if desired. TI recommends using a 0.1-µF power-

supply bypass capacitor for good local bypassing. Figure 11 shows a typical configuration for the TMP411 .

(1)

Diode-connected configuration provides better settling time. Transistor-connected configuration provides better series

resistance cancellation. NPN transistors must be diode-connected. PNP transistors can either be transistor or diode-

connected. TI recommends this layout for the MMBT3906LP and MMBT3904LP devices.

(2)

Rs (optional) must be < 1.5 kΩ in most applications. Selections of Rs depends on specific applications; see the

Filtering section.

(3)

CDIFF (optional) must be < 1000 pF in most applications. Selection of CDIFF depends on specific application; see the

Filtering section and Figure 5.

Figure 11. Basic Connections

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