STTS75M2F datasheet(15/39 Pages) STMICROELECTRONICS

15 / 39 page

STTS75

Operation

15/39

2.7

Temperature data format

Table 4 shows the relationship between the output digital data and the external temperature

for 12-bit resolution.

Temperature data for temperature, TOS and THYS registers is represented by 9-bit, 10-bit,

11-bit, and 12-bit depending upon the resolution bits RC1, RC0 (Bits 6 and 5) in the

configuration register (see Table 7 on page 18). The default resolution is 9-bits.

The left-most bit in the output data stream controls temperature polarity information for each

conversion. If the sign bit is '0', the temperature is positive and of the sign bit is '1', the

temperature is negative.

2.8

Bus timeout feature

The STTS75 supports an SMBus compatible timeout function which will reset the serial

I2C/SMBus interface if SDA is held low for a period greater than the timeout duration

between a START and STOP condition. If this occurs, the device will release the bus and

wait for another START condition.

Table 4.

Relationship between temperature and digital output

Temperature

Digital

output

(HEX)

Sign

Number of bits used by

conversion resolution

910

Always

zero

12-bit resolution

0000

11-bit resolution

0000

10-bit resolution

0000

9-bit resolution

0000

+125°C

111

1101

0000

7D00

+25.0625°C

001

1001

0000

1910

+10.125°C

000

1010

0000

0A20

+0.5°C

000

0000

0080

0°C

000

0000

–0.5°C

111

1111

0000

FF80

–10.25°C

111

0101

0000

F5E0

–25.0625°C

110

0110

0000

E6F0

–55°C

100

1001

0000

C900

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