TMP105

SLLS648D

– FEBRUARY 2005 – REVISED SEPTEMBER 2011

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Table 1. Pointer Register Byte

P7

P6

P5

P4

P3

P2

P1

P0

0

0

0

0

0

0

Register Bits

Table 2. Pointer Addresses of the TMP105

P1

P0

REGISTER

0

0

Temperature Register (Read Only)

0

1

Configuration Register (Read/Write)

1

0

TLOW Register (Read/Write)

1

1

THIGH Register (Read/Write)

TEMPERATURE REGISTER

The Temperature Register of the TMP105 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. Note that byte 1 is

the most significant byte; byte 2 is the least significant byte (sent in this order). The first 12 bits are used to

indicate temperature, with all remaining bits equal to zero. The least significant byte does not have to be read if

that information is not needed. Data format for temperature is summarized in Table 5. Following power-up or

reset, the Temperature Register will read 0

°C until the first conversion is complete.

Table 3. Byte 1 of Temperature Register

D7

D6

D5

D4

D3

D2

D1

D0

T11

T10

T9

T8

T7

T6

T5

T4

Table 4. Byte 2 of Temperature Register

D7

D6

D5

D4

D3

D2

D1

D0

T3

T2

T1

T0

0

0

0

0

Table 5. 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

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

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.

6

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