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TMP411BD Datasheet(PDF) 6 Page - Texas Instruments

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No. de pieza TMP411BD
Descripción Electrónicos  Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TMP411BD Datasheet(HTML) 6 Page - Texas Instruments

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TMP411
SBOS383C − DECEMBER 2006 − REVISED MAY 2008
www.ti.com
6
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
be
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
(typ)
10k
(typ)
10k
(typ)
10k
(typ)
TMP411
D+
D
V+
1
8
7
6
4
5
3
2
R
S
(2)
R
S
(2)
C
DIFF
(3)
C
DIFF
(3)
R
S
(2)
R
S
(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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