TMP102 datasheet(6/19 Pages) BURR-BROWN | Low Power Digital Temperature Sensor With SMBus™/Two-Wire Serial Interface in SOT563

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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

the

TMP102

can

used

distinguish

between

the

two

configured

12-bit,

read-only

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

Table 3. Byte 1 of Temperature Register(1)

stores the output of the most recent conversion. Two

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

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.

One LSB equals 0.0625

°C. Negative numbers are

represented in binary two's complement format.

(T4)

(T3)

(T2)

(T1)

(T0)

(0)

(1)

Following

power-up

reset,

the

Temperature

(1) Extended mode 13-bit configuration shown in parenthesis.

°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

0101 0000 0000

500

0100 1011 0000

4B0

0011 0010 0000

320

0001 1001 0000

190

0.25

0000 0000 0100

004

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

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