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TMP275 Datenblatt(PDF) 8 Page - Texas Instruments

Teilenummer TMP275
Bauteilbeschribung  TMP275 짹0.5째C Temperature Sensor With I2C and SMBus Interface in Industry Standard LM75 Form Factor and Pinout
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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TMP275 Datenblatt(HTML) 8 Page - Texas Instruments

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Diode
Temp.
Sensor
Σ
A/D
Converter
OSC
Control
Logic
Serial
Interface
Config.
and Temp.
Register
Temperature
ALERT
SDA
1
3
4
8
6
5
GND
V+
A1
SCL
2
7
A0
A2
TMP275
SBOS363E – JUNE 2006 – REVISED NOVEMBER 2015
www.ti.com
7 Detailed Description
7.1 Overview
The TMP275 is a digital temperature sensor that is optimal for thermal management and thermal protection
applications. The TMP275 is Two-Wire, SMBus, and I2C interface-compatible, and is specified over a
temperature range of
−40°C to 125°C. The temperature sensor in the TMP275 is the chip itself. Thermal paths
run through the package leads as well as the plastic package. The package leads provide the primary thermal
path because of the lower thermal resistance of the metal. See Functional Block Diagram for the internal block
diagram of TMP275 device.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Digital Temperature Output
The temperature register of the TMP275 is a 12-bit, read-only register that stores the output of the most recent
conversion. Two bytes must be read to obtain data, and are described in Figure 13 and Figure 14. Note that byte
1 is the most significant byte, followed by byte 2, the least significant byte. The first 12 bits are used to indicate
temperature, with all remaining bits equal to zero. The least significant byte does not have to be read if that
information is not needed. Data format for temperature is summarized in Table 1. Following power up or reset,
the Temperature Register reads 0°C until the first conversion is complete. The user can obtain 9, 10, 11, or 12
bits of resolution by addressing the Configuration Register and setting the resolution bits accordingly. For 9-, 10-,
or 11-bit resolution, the most significant bits in the Temperature Register are used with the unused LSBs set to
zero
Table 1. Temperature Data Format
TEMPERATURE
DIGITAL OUTPUT
HEX
(°C)
(BINARY)
128
0111 1111 1111
7FF
127.9375
0111 1111 1111
7FF
100
0110 0100 0000
640
80
0101 0000 0000
500
75
0100 1011 0000
4B0
50
0011 0010 0000
320
25
0001 1001 0000
190
0.25
0000 0000 0100
004
0
0000 0000 0000
000
–0.25
1111 1111 1100
FFC
–25
1110 0111 0000
E70
–55
1100 1001 0000
C90
8
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Product Folder Links: TMP275


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