Datasheet

APPLICATION INFORMATION
0.1 Fm
10kW
(typ)
10kW
(typ)
TMP441
DXP
DXN
V+
8
7
6
5
2
1
R
S
(2)
R
S
(2)
C
DIFF
(3)
C
DIFF
(3)
R
S
(2)
R
S
(2)
GND
SCL
SDA
+5V
SMBus
Controller
Diode-connectedtransistorconfiguration :
(1)
SeriesResistance
GNDcollector-connectedtransistorconfiguration:
(1)
(1)Diode-connectedtransistorconfigurationprovidesbettersettlingtime.
GNDcollector-connectedtransistorconfigurationprovidesbetterseriesresistancecancellation.
(2)R shouldbe<1kW inmostapplications.SelectionofR dependsonapplication;seethe section.Filtering
S
S
(3)C shouldbe<500pFinmostapplications.SelectionofC dependsonapplication;
DIFF
DIFF
NOTES:
A1
A0
4
3
seethe sectionandFigure9,Filtering RemoteTemperatureErrorvsDifferentialCapacitance.
TMP442
DXP1
DXN1
5
2
1
R
S
(2)
R
S
(2)
C
DIFF
(3)
C
DIFF
(3)
R
S
(2)
R
S
(2)
GND
Diode-connectedtransistorconfiguration :
(1)
SeriesResistance
GNDcollector-connectedtransistorconfiguration:
(1)
(1)Diode-connectedtransistorconfigurationprovidesbettersettlingtime.
GNDcollector-connectedtransistorconfigurationprovidesbetterseriesresistancecancellation.
(2)R shouldbe<1kW inmostapplications. SelectionofR dependsonapplication;seethe section.
SelectionofC dependsonapplication;
Filtering
(3)C shouldbe<500pFinmostapplications.
S
S
DIFF
DIFF
NOTES:
DXP2
DXN2
4
3
R
S
(2)
R
S
(2)
C
DIFF
(3)
0.1 Fm
10kW
(typ)
10kW
(typ)
V+
8
7
6
SCL
SDA
+5V
SMBus
Controller
DXP1
DXN1
DXP2
DXN2
seethe sectionandFigure9,Filtering RemoteTemperatureErrorvsDifferentialCapacitance.
TMP441
TMP442
SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 .............................................................................................................................................. www.ti.com
For proper remote temperature sensing operation, the
The TMP441/42 are digital temperature sensors that
TMP441 requires only a transistor connected
combine a local die temperature measurement
between DXP and DXN; the TMP442 requires
channel and one (TMP441) or two (TMP442) remote
transistors connected between DXP1 and DXN1 and
junction temperature measurement channels in a
between DXP2 and DXN2. The SCL and SDA
single SOT23-8 package. The TMP441/42 are
interface pins require pull-up resistors as part of the
Two-Wire- and SMBus interface-compatible and are
communication bus. A 0.1 µ F power-supply bypass
specified over a temperature range of – 40 ° C to
capacitor is recommended for good local bypassing.
+125 ° C. The TMP441/42 contain multiple registers
Figure 12 shows a typical configuration for the
for holding configuration information and temperature
TMP441; Figure 13 shows a typical configuration for
measurement results.
the TMP442.
Figure 12. TMP441 Basic Connections
Figure 13. TMP442 Basic Connections
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