STTS75 datasheet(18/39 Pages) STMICROELECTRONICS

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Functional description

STTS75

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3.1.2

Configuration register

The configuration register is used to store the device settings such as device operation

mode, OS/INT operation mode, OS/INT polarity, and OS/INT fault queue.

The configuration register allows the user to program various options such as conversion

resolution (see Table 8), thermostat fault tolerance, thermostat polarity, thermostat operating

mode, and shutdown mode. The user has READ/WRITE access to all of the bits in the

configuration register. The entire register is volatile and thus powers-up in its default state

only.

Table 7.

Configuration register format

Byte

MSB

LSB

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

STTS75

OSM

RC1

RC0

FT1

FT0

POL

Default

00000000

Keys:

SD = shutdown control bit

FT1 = fault tolerance1 bit

M = thermostat mode(1)

Indicates operation mode; 0 = comparator mode, and 1 = interrupt mode (see Comparator mode and

Interrupt mode on page 13).

RC0 = resolution conversion0 bit

POL = output polarity(2)

The OS/INT is active-low ('0').

RC1 = resolution conversion1 bit

FT0 = fault tolerance0 bit

OSM = one-shot mode bit

Table 8.

Programmable resolution configurations

RC1

RC0

Resolution

Conversion time

(max)

Remarks

9-bit

0.5°C

85 ms

Default resolution

10-bit

0.25°C

170 ms

11-bit

0.125°C

340 ms

12-bit

0.0625°C

680 ms

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