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TMP102 датащи(PDF) 6 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
номер детали TMP102
подробное описание детали  Low Power Digital Temperature Sensor With SMBus??Two-Wire Serial Interface in SOT563
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производитель  BURR-BROWN [Burr-Brown (TI)]
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TMP102 датащи(HTML) 6 Page - Burr-Brown (TI)

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TEMPERATURE REGISTER
TMP102
SBOS397 – AUGUST 2007
complete. Bit D0 of byte 2 indicates Normal mode
(EM bit = '0') or Extended mode (EM bit = '1') and
The
Temperature
Register
of
the
TMP102
is
can
be
used
to
distinguish
between
the
two
configured
as
a
12-bit,
read-only
register
temperature register data formats. The unused bits in
(Configuration Register EM bit = '0', see the
the Temperature Register always read '0'.
Extended Mode section), or as a 13-bit, read-only
register (Configuration Register EM bit = '1') that
Table 3. Byte 1 of Temperature Register(1)
stores the output of the most recent conversion. Two
D7
D6
D5
D4
D3
D2
D1
D0
bytes must be read to obtain data, and are described
in Table 3 and Table 4. Note that byte 1 is the most
T11
T10
T9
T8
T7
T6
T5
T4
significant byte, followed by byte 2, the least
(T12)
(T11)
(T10)
(T9)
(T8)
(T7)
(T6)
(T5)
significant byte. The first 12 bits (13 bits in Extended
(1) Extended mode 13-bit configuration shown in parenthesis.
mode) are used to indicate temperature. The least
significant byte does not have to be read if that
Table 4. Byte 2 of Temperature Register(1)
information is not needed. The data format for
temperature is summarized in Table 5 and Table 6.
D7
D6
D5
D4
D3
D2
D1
D0
One LSB equals 0.0625
°C. Negative numbers are
T3
T2
T1
T0
0
0
0
0
represented in binary two's complement format.
(T4)
(T3)
(T2)
(T1)
(T0)
(0)
(0)
(1)
Following
power-up
or
reset,
the
Temperature
(1) Extended mode 13-bit configuration shown in parenthesis.
Register will read 0
°C until the first conversion is
Table 5. 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.
For positive temperatures (for example, +50
°C):
Two's complement is not performed on positive numbers. Therefore, simply convert the number to binary
code with the 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
For negative temperatures (for example, –25
°C):
Generate the Two's 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|)/(0.0625°C/count) = 400 = 190h = 0001 1001 0000
Two's complement format: 1110 0110 1111 + 1 = 1110 0111 0000
6
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