Datasheet

STTS75 Operation
Doc ID 13298 Rev 11 15/41
2.7 Temperature data format
Tabl e 4 shows the relationship between the output digital data and the external temperature
for 12-bit resolution.
Temperature data for temperature, T
OS
and T
HYS
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-bit.
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
I
2
C/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
9101112
Always
zero
12-bit resolution 0000
11-bit resolution 0 0000
10-bit resolution 0 0 0000
9-bit resolution 0 0 0 0000
+125 °C 0 111 1101 0 0 0 0 0000 7D00
+25.0625 °C 0 001 1001 0 0 0 1 0000 1910
+10.125 °C 0 000 1010 0 0 1 0 0000 0A20
+0.5 °C 0 000 0000 1 0 0 0 0000 0080
0°C 0 000 0000 0 0 0 0 0000 0000
–0.5 °C 1 111 1111 1 0 0 0 0000 FF80
–10.25 °C 1 111 0101 1 1 1 0 0000 F5E0
–25.0625 °C 1 110 0110 1 1 1 1 0000 E6F0
–55 °C 1 100 1001 0 0 0 0 0000 C900