Table 7-1. 12/13-Bit Temperature Data Guidelines

EM Bit

Temperature Bit Length

Q Notation

LSB (°C)

Range (+)

0

12

4

0.0625

127.93475

1

13

4

0.0625

256

Two bytes must be read to obtain data. Byte 1 is the most significant byte (MSB), followed by byte 2, the least

significant byte (LSB). The first 12 bits (13 bits in extended mode) are used to indicate temperature. The least

significant byte does not have to be read if that information is not needed. The data format for temperature

is summarized in Table 7-2 and Table 7-3. 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. Bit D0 of byte 2 indicates normal mode (EM bit = 0) or extended mode (EM bit =

1), and can be used to distinguish between the two temperature register data formats. The unused bits in the

temperature register always read 0.

Table 7-2. 12-Bit Temperature Data Format

TEMPERATURE (°C)

DIGITAL OUTPUT (BINARY)

HEX

>127.9375

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

0.0625

0000 0000 0001

001

0

0000 0000 0000

000

-0.0625

1111 1111 1111

FFF

–0.25

1111 1111 1100

FFC

–25

1110 0111 0000

E70

–55

1100 1001 0000

C90

Table 7-2 does not list all temperatures. Use the following rules to obtain the digital data format for a given

temperature or the temperature for a given digital data format.

To convert positive temperatures to a digital data format:

1. Divide the temperature by the resolution

2. 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 / LSB) = 800 = 320h = 0011 0010 0000

To convert a positive digital data format to temperature:

1. Convert the 12-bit, left-justified binary temperature result, with the MSB = 0 to denote a positive sign, to a

decimal number.

2. Multiply the decimal number by the resolution to obtain the positive temperature.

Example: 0011 0010 0000 = 320h = 800 × (0.0625°C / LSB) = 50°C

To convert negative temperatures to a digital data format:

1. Divide the absolute value of the temperature by the resolution, and convert the result to binary code with a

12-bit, left-justified format.

2. 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 / LSB) = 400 = 190h = 0001 1001 0000

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