Datasheet

STTS751 STTS751 register summary
Doc ID 16483 Rev 5 15/36
4.3 Temperature limit register format
The high and low limit registers have the same format as the temperature register with the
integer portion of the two's complement value stored in the high byte and the fractional
portion in the low byte. These registers are read-write.
Note that the high limit defaults to 85 °C.
4.4 Temperature examples
The table below shows several examples of how the data is arranged in the high and low
byte pairs used for the temperature and limit registers.
Note: The maximum and minimum values for the temperature registers are 127.9375 (7F:F0h,
high byte : low byte) and –64 (C0:00h), respectively. This also applies to the high and low
limit registers.
Table 12. Temperature limit register (two’s complement format)
ADDR
(hex)
R/W Register b7 b6 b5 b4 b3 b2 b1 b0
Power-up
default (hex)
05 R/W High limit - high byte sign 64 °C 32 °C 16 °C 8 °C 4°C 2 °C 1 °C 55 (85 °C, dec)
06 R/W High limit - low byte ½ °C ¼ °C
1
/
8
°C
1
/
16
°C 0 0 0 0 00
07 R/W Low limit - high byte sign 64 °C 32 °C 16 °C 8 °C 4°C 2 °C 1 °C 00
08 R/W Low limit - low byte ½ °C ¼ °C
1
/
8
°C
1
/
16
°C 0 0 0 0 00
Table 13. Temperature examples (two’s complement format)
b7 b6 b5 b4 b3 b2 b1 b0
Weighting of the
bits
High byte sign 64 °C 32 °C 16 °C 8 °C 4°C 2 °C 1 °C
Low byte ½ °C ¼ °C
1
/
8
°C
1
/
16
°C 0 0 0 0
–64 °C
High byte 1 1 0 0 0 0 0 0
Low byte 0 0 0 0 0 0 0 0
–63 °C
High byte 1 1 0 0 0 0 0 1
Low byte 0 0 0 0 0 0 0 0
–1 °C
High byte 1 1 1 1 1 1 1 1
Low byte 0 0 0 0 0 0 0 0
+1 °C
High byte 0 0 0 0 0 0 0 1
Low byte 0 0 0 0 0 0 0 0
+5.3125 °C
(1)
High byte 0 0 0 0 0 1 0 1
Low byte 0 1 0 1 0 0 0 0
+125 °C
High byte 0 1 1 1 1 1 0 1
Low byte 0 0 0 0 0 0 0 0
1. With 12-bit resolution selected.