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TMP108AIYFFT Scheda tecnica(PDF) 7 Page - Texas Instruments

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Il numero della parte TMP108AIYFFT
Spiegazioni elettronici  Low Power Digital Temperature Sensor With Two-Wire Serial Interface in WCSP
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TMP108
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SBOS663 – APRIL 2013
TEMPERATURE REGISTER
The temperature register is configured as a 12-bit, read-only register that stores the output of the most recent
conversion. Two bytes must be read to obtain data, as shown in Table 3 and Table 4. 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. There is no requirement to read the least significant byte if that information is not needed (for
example, for resolution lower than 1°C). Table 5 summarizes the temperature data format. One LSB equals
0.0625°C. 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. The unused bits in the temperature
register always read '0'.
Table 3. Byte 1 of Temperature Register
D7
D6
D5
D4
D3
D2
D1
D0
T11
T10
T9
T8
T7
T6
T5
T4
Table 4. Byte 2 of Temperature Register
D7
D6
D5
D4
D3
D2
D1
D0
T3
T2
T1
T0
0
0
0
0
Table 5. Temperature Data Format(1)
DIGITAL OUTPUT
TEMPERATURE (°C)
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 temperature sensor ADC resolution is 0.0625°C/count.
Table 5 does not supply a full list of all temperatures. Use the following rules to obtain the digital data format for
a given temperature.
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/count) = 800 = 320h = 0011 0010 0000
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/count) = 400 = 190h = 0001 1001 0000
Twos complement format: 1110 0110 1111 + 1 = 1110 0111 0000
Copyright © 2013, Texas Instruments Incorporated
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