TMP411CD datasheet(6/32 Pages) TI

6 / 32 page

TMP411

SBOS383C − DECEMBER 2006 − REVISED MAY 2008

www.ti.com

APPLICATIONS INFORMATION

The TMP411 is a dual-channel digital temperature sensor

that combines a local die temperature measurement

channel and a remote junction temperature measurement

channel in a single MSOP-8 or SO-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 contains multiple registers for

holding

configuration

information,

temperature

measurement

results,

temperature

comparator

maximum/minimum limits, and status information.

User-programmed high and low temperature limits stored

in the TMP411 can be used to trigger an over/under

temperature alarm (ALERT) on local and remote

temperatures.

Additional

thermal

limits

can

programmed into the TMP411 and used to trigger another

flag (THERM) that can be used to initiate 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 pull-up

resistors as part of the communication bus, while ALERT

and THERM are open-drain outputs that also need pull−up

resistors. ALERT and THERM may be shared with other

devices if desired for a wired-OR implementation. A 0.1

µF

power-supply bypass capacitor is recommended for good

local bypassing. Figure 11 shows a typical configuration

for the TMP411.

0.1

µF

10k

Ω

(typ)

10k

Ω

(typ)

10k

Ω

(typ)

10k

Ω

(typ)

TMP411

D+

−

V+

(2)

DIFF

(3)

DIFF

(3)

(2)

GND

SCL

SDA

ALERT/THERM2

THERM

+5V

SMBus

Controller

Fan Controller

Diode−connected configuration(1):

Series Resistance

Transistor−connected configuration(1):

(1) Diode−connected configuration provides better settling time.

Transistor−connected configuration provides better series resistance cancellation.

(2) R

S (optional) should be < 1.5kΩ in most applications. Selection of RS depends on

specific application; see Filtering section.

(3) C

DIFF (optional) should be < 1000pF in most applications. Selection of CDIFF

depends on specific application; see Filtering section and Figure 6, Remote

Temperature Error vs Differential Capacitance.

NOTES:

Figure 11. Basic Connections

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