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TMP104YFFT データシート(PDF) 11 Page - Texas Instruments

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部品番号 TMP104YFFT
部品情報  Low-Power, Digital Temperature Sensor with SMAART Wire Interface
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TMP104
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SBOS564A
– NOVEMBER 2011 – REVISED NOVEMBER 2011
Negative numbers are represented in binary twos complement format. Following power-up or reset, the
Temperature Register reads 0
°C until the first conversion is complete.
Table 5. 8-Bit Temperature Data Format(1)
DIGITAL OUTPUT
TEMPERATURE (
°C)
BINARY
HEX
128
0111 1111
7F
127
0111 1111
7F
100
0110 0100
64
80
0101 0000
50
75
0100 1011
4B
50
0011 0010
32
25
0001 1001
19
0
0000 0000
00
–1
1111 1111
FF
–25
1110 0111
E7
–55
1100 1001
C9
(1)
The resolution for the analog-to-digital converter (ADC) is 1
°C/count, where count is equal to the digital
output of the ADC.
For positive temperatures (for example, +50
°C):
Twos complement is not performed on positive numbers. Therefore, simply convert the number to binary
code, left-justified format. Denote a positive number with most significant bit (MSB) = 0.
Example: (+50
°C)/(1°C/count) = 50 = 32h = 0011 0010
For negative temperatures (for example,
–25°C):
Generate the twos complement of a negative number by complementing the absolute value binary number
and adding 1. Denote a negative number with MSB = 1.
Example: (|
–25°C|)/(1°C/count) = 25 = 19h = 0001 1001
Twos complement format: 1110 0110 + 1 = 1110 0111
Copyright
© 2011, Texas Instruments Incorporated
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