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TMP422-Q1 Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce TMP422-Q1
Description  Remote and Local Temperature Sensor
Download  38 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TMP422-Q1 Fiches technique(HTML) 10 Page - Texas Instruments

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background image
ADC
Oscillator
Voltage
Reference
M
U
X
Register
Bank
Serial
Interface
Control
Logic
MUX
5 × I
2 × I
I
6
7
4
8
1
2
5
V+
Local
Thermal BJT
A0
SCL
SDA
DXN
DXP
GND
V+
20 × I
3
A1
Copyright © 2016, Texas Instruments Incorporated
10
TMP421-Q1, TMP422-Q1, TMP423-Q1
SBOS821 – NOVEMBER 2016
www.ti.com
Product Folder Links: TMP421-Q1 TMP422-Q1 TMP423-Q1
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The TMP421-Q1 is a two-channel digital temperature sensor that combines a local die temperature-
measurement channel and a remote-junction temperature-measurement channel, and is available in an 8-pin
SOT-23 package. The TMP422-Q1 (three-channel), and TMP423-Q1 (four-channel) are digital temperature
sensors that combine a local die temperature measurement channel and two or three remote junction
temperature measurement channels, respectively, in a single 8-pin SOT-23 package. These devices are two-
wire- and SMBus interface-compatible and are specified over a temperature range of –40°C to +125°C. The
TMP421-Q1, TMP422-Q1, and TMP423-Q1 each contain multiple registers for holding configuration information
and temperature measurement results.
For proper remote temperature sensing operation, the TMP421-Q1 requires only a transistor connected between
DXP and DXN pins. If the remote channel is not utilized, DXP can be left open or tied to GND.
The TMP422-Q1 requires transistors connected between DX1 and DX2 and between DX3 and DX4. Unused
channels on the TMP422-Q1 must be connected to GND. The TMP423-Q1 requires a transistor connected to
each positive channel (DXP1, DXP2, and DXP3), with the base of each channel tied to the common negative,
DXN. For an unused channel, the TMP423-Q1 DXP pin can be left open or tied to GND.
8.2 Functional Block Diagram
Figure 12. The TMP421-Q1 Supports Multiple Slave Addresses and a Single Remote Diode Input


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