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TMP422-EP Folha de dados(PDF) 8 Page - Texas Instruments

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Nome de Peças TMP422-EP
Descrição Electrónicos  짹1째C REMOTE TEMPERATURE AND 짹2.5째C LOCAL TEMPERATURE SENSOR IN SOT23-8
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

TMP422-EP Folha de dados(HTML) 8 Page - Texas Instruments

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TMP422
DX1
(4)
DX2
(4)
5
2
1
R
S
(2)
R
S
(2)
C
DIFF
(3)
C
DIFF
(3)
R
S
(2)
R
S
(2)
GND
Diode-connectedconfiguration :
(1)
SeriesResistance
Transistor-connectedconfiguration :
(1)
DX3
(4)
DX4
(4)
4
3
R
S
(2)
R
S
(2)
C
DIFF
(3)
0.1 F
m
10kW
(typ)
10kW
(typ)
V+
8
7
6
SCL
SDA
+5V
SMBus
Controller
DXP1
DXN1
DXP2
DXN2
TMP422-EP
SBOS577
– SEPTEMBER 2011
www.ti.com
APPLICATION INFORMATION
The TMP422 (three-channel) is a digital temperature sensor that combines a local die temperature measurement
channel and two remote junction temperature measurement channels in a single SOT23-8 package. This device
is two-wire- and SMBus interface-compatible and are specified over a temperature range of
–55°C to +125°C.
The TMP422 contains multiple registers for holding configuration information and temperature measurement
results.
The TMP422 requires transistors connected between DX1 and DX2 and between DX3 and DX4. Unused
channels on the TMP422 must be connected to GND.
The TMP422 SCL and SDA interface pins each require pull-up resistors as part of the communication bus. A
0.1
μF power-supply bypass capacitor is recommended for local bypassing. Figure 11 illustrates a typical
application for the TMP422.
(1) Diode-connected configuration provides better settling time. Transistor-connected configuration provides better series resistance
cancellation.
(2) RS (optional) should be < 1.5kΩ in most applications. Selection of RS depends on application; see the Filtering section.
(3) CDIFF (optional) should be < 1000pF in most applications. Selection of CDIFF depends on application; see the Filtering section and
Figure 6, Remote Temperature Error vs Differential Capacitance.
(4) TMP422 SMBus slave address is 1001 100 when connected as shown.
Figure 11. TMP422 Basic Connections
8
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© 2011, Texas Instruments Incorporated
Product Folder Link(s): TMP422-EP


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