STLM75 datasheet(19/37 Pages) STMICROELECTRONICS

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STLM75

Functional description

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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.

Note:

These are comparable formats to the DS75 and LM75.

3.2

Power-up default conditions

The STLM75 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

Bytes

HS byte

LS byte

Bits

MSB

TMSB

TLSB

LSB

STLM75

TMSB

TD TD TD TD TD TD

9-bit

TLSB

Keys: SB = two’s complement sign bit

TMSB = temperature MSB

TLSB = temperature LSB

TD = temperature data

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