TMP411CD datasheet(19/61 Pages) TI2

19 / 61 page

7 Detailed Description

7.1 Overview

The TMP411/TMP411D is a dual-channel digital temperature sensor that combines a local die-temperature

measurement channel in a single VSSOP-8, SOIC-8 or SOT23-8 package. The TMP411/TMP411D is two-wire

and SMBus interface-compatible and is specified over a temperature range of –40°C to 125°C. The TMP411/

TMP411D 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/TMP411D triggers an overtemperature

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

the TMP411/TMP411D and can trigger another flag (THERM) that initiates a system response to rising

temperatures.

The TMP411/TMP411D 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

0.1µF power-supply bypass capacitor for good local bypassing. Figure 7-1 shows a typical configuration for the

TMP411/TMP411D.

0.1µF

D+

V+

CDIFF

GND

SCL

SDA

ALERT/THERM2

THERM

+5V

SMBus

Controller

Fan Controller

Series Resistance

(B)

(C)

(B)

10k

(typ)

10k

(typ)

10k

(typ)

10k

(typ)

TMP411

TMP411D

CDIFF

(C)

(B)

PNP Diode-connected configuration

(A):

Transistor-connected configuration

(A):

NPN Diode-connected configuration

(A):

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.

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

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

Figure 6-12 (Figure 6-13 for new chip) and Figure 6-27.

Figure 7-1. Basic Connections

www.ti.com

TMP411, TMP411D

SBOS383E – DECEMBER 2006 – REVISED JULY 2025

Submit Document Feedback

Product Folder Links: TMP411 TMP411D

TMP411CD Datasheet(PDF) 19 Page - Texas Instruments

TMP411CD Datasheet(HTML) 19 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61

Datasheet Download

Link URL