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TMP102AIDRLR Fiches technique(PDF) 6 Page - Texas Instruments

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No de pièce TMP102AIDRLR
Description  Low Power Digital Temperature Sensor With SMBus??Two-Wire Serial Interface in SOT563
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

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TMP102
SBOS397C – AUGUST 2007 – REVISED OCTOBER 2012
www.ti.com
TEMPERATURE REGISTER
indicates Normal mode (EM bit = '0') or Extended
mode (EM bit = '1') and can be used to distinguish
The
Temperature
Register
of
the
TMP102
is
between the two temperature register data formats.
configured
as
a
12-bit,
read-only
register
The unused bits in the Temperature Register always
(Configuration Register EM bit = '0', see the Extended
read '0'.
Mode section), or as a 13-bit, read-only register
(Configuration Register EM bit = '1') that stores the
Table 3. Byte 1 of Temperature Register(1)
output of the most recent conversion. Two bytes must
D7
D6
D5
D4
D3
D2
D1
D0
be read to obtain data, and are described in Table 3
and Table 4. Note that byte 1 is the most significant
T11
T10
T9
T8
T7
T6
T5
T4
byte, followed by byte 2, the least significant byte.
(T12)
(T11)
(T10)
(T9)
(T8)
(T7)
(T6)
(T5)
The first 12 bits (13 bits in Extended mode) are used
(1) Extended mode 13-bit configuration shown in parenthesis.
to indicate temperature. The least significant byte
does not have to be read if that information is not
Table 4. Byte 2 of Temperature Register(1)
needed.
The
data
format
for
temperature
is
summarized in Table 5 and Table 6. One LSB equals
D7
D6
D5
D4
D3
D2
D1
D0
0.0625°C. Negative numbers are represented in
T3
T2
T1
T0
0
0
0
0
binary twos complement format. Following power-up
(T4)
(T3)
(T2)
(T1)
(T0)
(0)
(0)
(1)
or reset, the Temperature Register will read 0°C until
(1) Extended mode 13-bit configuration shown in parenthesis.
the first conversion is complete. Bit D0 of byte 2
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):
Twos 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 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|)/(0.0625°C/count) = 400 = 190h = 0001 1001 0000
Twos complement format: 1110 0110 1111 + 1 = 1110 0111 0000
6
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