STCN75DS2F datasheet(18/35 Pages) STMICROELECTRONICS

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Functional description

STCN75

18/35

3.1.5

Hysteresis temperature register (THYS)

THYS register is a two-byte (16-bit) READ/WRITE register that stores the user-

programmable lower trip-point temperature for the thermal alarm in two’s complement

format (see Table 8). This register defaults to 75°C at power-up (i.e., 0100 1011 0000

0000).

The format of this register is the same as that of the Temperature register. The MSB

position contains the sign bit for the digital temperature and Bit14 contains the temperature

MSB.

3.2

Power-up default conditions

The STCN75 always powers up in the following default states:

●

Thermostat mode = comparator mode

●

Polarity = active-low

●

Fault tolerance = 1 fault (i.e., relevant bits set to '0' in the configuration register)

●

TOS = 80°C

●

THYS = 75°C

●

Note:

After power-up these conditions can be reprogrammed via the serial interface.

Table 8.

TOS and THYS register format

(1)

These are comparable formats to the DS75 and LM75.

Bytes

HS byte

LS byte

Bits

MSB

TMSB

TLSB

LSB

STCN75

TMSB

TD TD TD TD TD TD

9-bit

TLSB

Keys: S = two’s complement sign bit

TMSB = temperature MSB

TLSB = temperature LSB

TD = temperature Data

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