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TMP75C-Q1 데이터시트(PDF) 8 Page - Texas Instruments

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부품명 TMP75C-Q1
상세설명  TMP75C-Q1 1.8-V Digital Temperature Sensor with Two-Wire Interface and Alert
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TMP75C-Q1
SBOS840 – NOVEMBER 2016
www.ti.com
Product Folder Links: TMP75C-Q1
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Copyright © 2016, Texas Instruments Incorporated
(1)
The temperature sensor resolution is 0.0625°C/LSB.
7.3 Feature Description
7.3.1 Digital Temperature Output
The 12-bit digital output from each temperature measurement conversion is stored in the read-only temperature
register. Two bytes must be read to obtain the data, as shown in Figure 14. Note that byte 1 is the most
significant byte, followed by byte 2, the least significant byte. The temperature result is left-justified with the 12
most significant bits used to indicate the temperature. There is no need to read the second byte if resolution
below 1°C is not required. Table 1 summarizes the temperature data format. One LSB equals 0.0625°C.
Negative numbers are represented in binary twos complement format.
Table 1. 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
–40
1101 1000 0000
D80
Table 1 does not supply a full list of all temperatures. Use the following rules to obtain the digital data format for
a given temperature, and vice versa.
To convert positive temperatures to a digital data format:
Divide the temperature by the resolution. Then, 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:
Convert the 12-bit, left-justified binary temperature result, with the MSB = 0 to denote a positive sign, to a
decimal number. Then, 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:
Divide the absolute value of the temperature by the resolution, and convert the result to binary code with a
12-bit, left-justified format. Then, 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:
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. 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 complement 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


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