Datasheet
0.1
m
F
10k
Ω
(typ)
10k
Ω
(typ)
10k
Ω
(typ)
10k
Ω
(typ)
TMP411-Q1
D+
D
−
V+
1
8
7
6
4
5
3
2
R
S
(B)
R
S
(B)
C
DIFF
(C)
C
DIFF
C)
R
S
(2)
R
S
(2)
GND
SCL
SDA
ALERT/THERM2
THERM
+5V
SMBus
Controller
Fan Controller
Diodeconnected configuration
(A)
:
Series Resistance
Transistor connected configuration
(A)
:
(
TMP411-Q1
SBOS527F –DECEMBER 2010–REVISED NOVEMBER 2013
www.ti.com
APPLICATION INFORMATION
The TMP411-Q1 is a dual-channel digital temperature The TMP411-Q1 requires only a transistor connected
sensor that combines a local die-temperature between D+ and D− for proper remote temperature-
measurement channel and a remote junction- sensing operation. The SCL and SDA interface pins
temperature measurement channel in a single require pullup resistors as part of the communication
VSSOP-8 package. The TMP411-Q1 is two-wire- and bus, whereas ALERT and THERM are open-drain
SMBus interface-compatible and is specified over an outputs that also need pullup resistors. ALERT and
ambient temperature range of −40°C to 125°C. The THERM may be shared with other devices if desired
TMP411-Q1 contains multiple registers for holding for a wired-OR implementation. A 0.1-μF power-
configuration information, temperature measurement supply bypass capacitor is recommended for good
results, temperature comparator maximum/minimum local bypassing. Figure 11 shows a typical
limits, and status information. configuration for the TMP411-Q1.
User-programmed high- and low-temperature limits
stored in the TMP411-Q1 can be used to trigger an
over- or undertemperature alarm (ALERT) on local
and remote temperatures. Additional thermal limits
can be programmed into the TMP411-Q1 and used to
trigger another flag (THERM) that can be used to
initiate a system response to rising temperatures.
A. Diode−connected configuration provides better settling time. Transistor−connected configuration provides better
series resistance cancellation.
B. R
S
(optional) should be <1.5 kΩ in most applications. Selection of RS depends on specific application; see Filtering
section.
C. C
DIFF
(optional) should be <1000 pF in most applications. Selection of C
DIFF
depends on specific application; see
Filtering section and Figure 6, Remote Temperature Error vs Differential Capacitance.
Figure 11. Basic Connections
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