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TMP423AIDCNT датащи(PDF) 8 Page - Texas Instruments

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номер детали TMP423AIDCNT
подробное описание детали  짹1째C Remote and Local TEMPERATURE SENSOR in SOT23-8
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TMP423AIDCNT датащи(HTML) 8 Page - Texas Instruments

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APPLICATION INFORMATION
0.1 F
m
10kW
(typ)
10kW
(typ)
TMP421
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-connectedconfiguration
:
(1)
SeriesResistance
Transistor-connectedconfiguration
:
(1)
A1
A0
4
3
TMP421
TMP422
TMP423
SBOS398B – JULY 2007 – REVISED MARCH 2008
The TMP421 (two-channel), TMP422 (three-channel),
The TMP422 requires transistors connected between
and TMP423 (four-channel) are digital temperature
DX1 and DX2 and between DX3 and DX4. Unused
sensors
that
combine
a
local
die
temperature
channels on the TMP422 must be connected to GND.
measurement channel and one, two, or three remote
The TMP423 requires a transistor connected to each
junction temperature measurement channels in a
positive channel (DXP1, DXP2, and DXP3), with the
single
SOT23-8
package.
These
devices
are
base of each channel tied to the common negative,
two-wire- and SMBus interface-compatible and are
DXN. For an unused channel, the TMP423 DXP pin
specified over a temperature range of –40
°C to
can be left open or tied to GND.
+125
°C. The TMP421/22/23 each contain multiple
The TMP421/22/23 SCL and SDA interface pins each
registers for holding configuration information and
require pull-up resistors as part of the communication
temperature measurement results.
bus. A 0.1
µF power-supply bypass capacitor is
For proper remote temperature sensing operation, the
recommended for local bypassing. Figure 11 shows a
TMP421
requires
only
a
transistor
connected
typical configuration for the TMP421; Figure 12
between DXP and DXN pins. If the remote channel is
illustrates a typical application for the TMP422.
not utilized, DXP can be left open or tied to GND.
Figure 13 illustrates a typical application for the
TMP423.
(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.
Figure 11. TMP421 Basic Connections
8
Submit Documentation Feedback
Copyright © 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): TMP421 TMP422 TMP423


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