STTS2004 datasheet(28/58 Pages) STMICROELECTRONICS

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Temperature sensor registers

STTS2004

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DocID024229 Rev 3

4.4.1

Alarm window trip

The device provides a comparison window with an upper temperature trip point in the alarm

upper boundary register, and a lower trip point in the alarm lower boundary register. When

enabled, the event output will be triggered whenever entering or exiting (crossing above or

below) the alarm window.

4.4.2

Critical trip

The device can be programmed in such a way that the event output is only triggered when

the temperature exceeds the critical trip point. The critical temperature setting is

programmed in the critical temperature register. When the temperature sensor reaches the

critical temperature value in this register, the device is automatically placed in comparator

mode, which means that the critical event output cannot be cleared by using software to set

the clear event bit.

Table 16. Temperature trip point register format

Name

Width

(bits)

Type

(R/W)

Default state

(POR)

UPPER

Alarm temperature upper boundary

R/W

00 00

LOWER

Alarm temperature lower boundary

R/W

00 00

CRITICAL

Critical temperature

R/W

00 00

Table 17. Alarm temperature upper boundary register format

Sign

MSB

LSB(1)

Bit

Bit(2)

Bit(3)

000

Alarm window upper boundary temperature

1. Bit 2 is LSB for default 10-bit mode.

2. Depending on status of the resolution register, bit 1 may display 0.125 °C value.

3. Depending on status of the resolution register, bit 0 may display 0.0625 °C value.

Table 18. Alarm temperature lower boundary register format

Sign

MSB

LSB(1)

Bit

Bit(2)

Bit(3)

000

Alarm window lower boundary temperature

1. Bit 2 is LSB for default 10-bit mode.

2. Depending on status of the resolution register, bit 1 may display 0.125 °C value.

3. Depending on status of the resolution register, bit 0 may display 0.0625 °C value.

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