used to address a given data register. The Pointer Register uses the two LSBs (see Table 4) to identify which of the

data registers must respond to a read or write command. The power-up reset value of P1/P0 is '00'. By default, the

TMP175 reads the temperature on power-up.

Table 4 lists the pointer address of the registers available in the TMP175 device. During a write command,

bytes P2 through P7 must always be 0.

Table 4. Pointer Address

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)

Table 5. Pointer Register Byte

P7

P6

P5

P4

P3

P2

P1

P0

0

0

0

0

0

0

Register Bits

Temperature Register

The Temperature Register of the TMP175 device is configured as 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 listed in Table 6. Byte 1 is

the most significant byte (MSB), followed by byte 2, the least significant byte (LSB). The T11~T0 bits are used

to indicate temperature. Byte 2 does not have to be read if that information is not needed. The power-on default

value of the temperature register is 0°C.

Table 6. Byte 1 and Byte 2 of Temperature Register

BYTE

D7

D6

D5

D4

D3

D2

D1

D0

1

T11

T10

T9

T8

T7

T6

T5

T4

2

T3

T2

T1

T0

0

0

0

0

Temperature Limit Register

The temperature limits are stored in the THIGH and TLOW registers in the same format as the temperature result.

Table 7 and Table 8 list the format for the THIGH and TLOW registers. The power-up reset values for THIGH and TLOW are:



THIGH = +80℃；TLOW = +75℃

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Low-Power, LM75-Compatible Digital Temperature Sensor WithSMBus and I 2C Interface

TMP175

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