Detailed Description

Temperature Output

The 12-bit digital output for each temperature measurement is stored in a read-only temperature sensor.

Obtaining this output requires reading out two bytes, as shown in Table 5. Where byte 1 is the most significant byte

(MSB), followed by byte 2 is the less significant byte (LSB), and the left-aligned upper 12 bits are used to indicate

the temperature. If less than 1°C temperature resolution is not required, the user can choose not to read byte 2.

The data format of the TMP75 temperature measurement results is listed in Table 1, where 1LSB = 0.0625°C,

and negative numbers are represented in two's complement.

When powered on or reset, the temperature register of the TMP75 will be set to 0000h until the next temperature

conversion is completed. Unused bits in the temperature register always read as 0 (not shown in the table below).

Table 1. Temperature Data Format

TEMPERATURE (°C)

DIGITAL OUTPUT (BINARY)

DIGITAL OUTPUT (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

Note: Table 1 does not provide data formats for all temperatures.

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UTD Semiconductor Co.,Limited

TMP75

1.8V Digital Temperature Sensor with I 2C Interface and Alarm Function

UMW R