STTS751 datasheet(15/36 Pages) STMICROELECTRONICS

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STTS751

STTS751 register summary

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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

Power-up

default (hex)

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)

R/W

High limit - low byte

½ °C

¼ °C

8 °C

16 °C

R/W

Low limit - high byte

sign

64 °C

32 °C

16 °C

8 °C

4°C

2 °C 1 °C

R/W

Low limit - low byte

½ °C

¼ °C

8 °C

16 °C

Table 13.

Temperature examples (two’s complement format)

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

8 °C

16 °C

–64 °C

High byte

Low byte

–63 °C

High byte

Low byte

–1 °C

High byte

Low byte

+1 °C

High byte

Low byte

+5.3125 °C(1)

High byte

Low byte

+125 °C

High byte

Low byte

With 12-bit resolution selected.

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