TMP112DX datasheet(14/46 Pages) TI1

14 / 46 page

ALERT

Core

SCL

GND

V+

SDA

TMP112

Figure 7-3. Equivalent Internal ESD Circuitry (SOT563-6 Package)

7.3 Feature Description

7.3.1 Digital Temperature Output

The digital output from each temperature measurement conversion is stored in the read-only temperature

EM bit to 0 in the configuration register; see Section 7.5.3.7 ), or as a 13-bit read-only register (setting the EM

bit to 1 in the configuration register) that stores the output of the most recent conversion. Two bytes must be

read to obtain data and are listed in Table 7-8 and Table 7-9. 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 listed 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 equals 0) or extended

mode (EM bit equals 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

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

0.0625

0000 0000 0001

001

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

TMP112, TMP112D

SBOS473L – MARCH 2009 – REVISED JULY 2024

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