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TMP112 Folha de dados(PDF) 8 Page - Texas Instruments

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Nome de Peças TMP112
Descrição Electrónicos  Low-Power Digital Temperature Sensor With SMBus and Two-Wire Serial Interface in SOT563
Download  30 Pages
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

TMP112 Folha de dados(HTML) 8 Page - Texas Instruments

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TMP102
SBOS397F – AUGUST 2007 – REVISED DECEMBER 2015
www.ti.com
Feature Description (continued)
Table 2. 12-Bit Temperature Data Format(1)
TEMPERATURE (°C)
DIGITAL OUTPUT (BINARY)
HEX
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
(1)
The resolution for the Temp ADC in Internal Temperature mode is 0.0625°C/count.
Table 2 does not list all temperatures. Use the following rules to obtain the digital data format for a given
temperature or the temperature for a given digital data format.
To convert positive temperatures to a digital data format:
1. Divide the temperature by the resolution
2. Convert the result to binary code with a 12-bit, left-justified format, and MSB = 0 to denote a positive sign.
Example: (50°C) / (0.0625°C / LSB) = 800 = 320h = 0011 0010 0000
To convert a positive digital data format to temperature:
1. Convert the 12-bit, left-justified binary temperature result, with the MSB = 0 to denote a positive sign, to a
decimal number.
2. Multiply the decimal number by the resolution to obtain the positive temperature.
Example: 0011 0010 0000 = 320h = 800 × (0.0625°C / LSB) = 50°C
To convert negative temperatures to a digital data format:
1. Divide the absolute value of the temperature by the resolution, and convert the result to binary code with a
12-bit, left-justified format.
2. Generate the twos complement of the result by complementing the binary number and adding one. Denote a
negative number with MSB = 1.
Example: (|–25°C|) / (0.0625°C / LSB) = 400 = 190h = 0001 1001 0000
Two's complement format: 1110 0110 1111 + 1 = 1110 0111 0000
To convert a negative digital data format to temperature:
1. Generate the twos compliment of the 12-bit, left-justified binary number of the temperature result (with MSB
= 1, denoting negative temperature result) by complementing the binary number and adding one. This
represents the binary number of the absolute value of the temperature.
2. Convert to decimal number and multiply by the resolution to get the absolute temperature, then multiply by
–1 for the negative sign.
Example: 1110 0111 0000 has twos compliment of 0001 1001 0000 = 0001 1000 1111 + 1
Convert to temperature: 0001 1001 0000 = 190h = 400; 400 × (0.0625°C / LSB) = 25°C = (|–25°C|);
(|–25°C|) × (–1) = –25°C
8
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