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SBOS383A − FEBRUARY 2007
(ALERT). 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.
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
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 0.1µF
power-supply bypass capacitor is recommended for good
local bypassing. Figure 11 shows a typical configuration
for the TMP411.
holding
measurement
configuration
results,
information,
temperature
temperature
comparator
maximum/minimum limits, and status information.
User-programmed high and low temperature limits stored
in the TMP401 can be used to monitor local and remote
temperatures to trigger an over/under temperature alarm
+5V
µ
0.1 F
Ω
10k
Ω
10k
Ω
Ω
10k
10k
(typ)
(typ)
(typ)
(typ)
Transistor−connected configuration(1)
:
1
Series Resistance
V+
8
(2)
SCL
SDA
RS
2
3
TMP411
D+
(3)
7
(2)
CDIFF
SMBus
Controller
RS
−
D
6
4
ALERT/THERM2
THERM
Fan Controller
GND
5
Diode−connected configuration(1)
:
(2)
RS
(3)
(1) Diode−connected configuration provides better settling time.
NOTES:
(2)
CDIFF
RS
Transistor−connected configuration provides better series resistance cancellation.
Ω
(2) RS should be < 1.5k in most applications.
(3) CDIFF should be < 1000pF in most applications.
Figure 11. Basic Connections
6
BB [ BURR-BROWN CORPORATION ]
