Datasheet

TMP100−EP

DIGITAL TEMPERATURE SENSOR

WITH I

C INTERFACE

SGLS254B − JULY 2005 − REVISED OCTOBER 2013

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

temperature register

The temperature register of the TMP100 or TMP101 is a 12-bit read-only register that 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. The

first 12 bits are used to indicate temperature with all remaining bits equal to zero. Data format for temperature

is summarized in Table 5. Following power-up or reset, the temperature register reads 0°C until the first

conversion is complete.

D7 D6 D5 D4 D3 D2 D1 D0

T11 T10 T9 T8 T7 T6 T5 T4

Table 3. Byte 1 of the Temperature Register

D7 D6 D5 D4 D3 D2 D1 D0

T3 T2 T1 T0 0 0 0 0

Table 4. Byte 2 of the Temperature Register

TEMPERATURE

(5C)

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

0.0 0000 0000 0000 000

−0.25 1111 1111 1100 FFC

−25 1110 0111 0000 E70

−55 1100 1001 0000 C90

−128 1000 0000 0000 800

Table 5. Temperature Data Format

The user can obtain 9, 10, 11, or 12 bits of resolution by addressing the configuration register and setting the

resolution bits accordingly. For 9, 10, or 11 bit resolution, the most significant bits in the temperature register

are used with the unused LSBs set to zero.