STTS424E02BDA3F datasheet(25/51 Pages) STMICROELECTRONICS

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STTS424E02

Temperature sensor registers

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4.4

Temperature trip point registers (r/w)

The STTS424E02 Alarm mode registers provide for 11-bit data in 2s compliment format.

The data provides for one LSB = 0.25°C. All unused bits in these registers are read as '0'.

The STTS424E02 has three temperature trip point registers (see Table 14):

●

Alarm temperature upper boundary threshold (Table 15),

●

Alarm temperature lower boundary threshold (Table 16), and

●

Critical temperature trip point value (Table 17).

Note:

If the upper or lower boundary threshold values are being altered in-system, all interrupts

should be turned off until a known state can be obtained to avoid superfluous interrupt

activity.

Table 13.

Temperature register bit definitions

Bit

Definition with Hysteresis = 0

Below (temperature) alarm window

– 0 = Temperature is equal to or above the alarm window lower boundary temperature.

– 1 = Temperature is below the alarm window.

Above (temperature) alarm window.

– 0 = Temperature is equal to or below the alarm window upper boundary temperature.

– 1 = Temperature is below the alarm window.

Above critical trip

– 0 = Temperature is below the critical temperature setting.

– 1 = Temperature is equal to or above the critical temperature setting.

Table 14.

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 15.

Alarm temperature upper boundary register format

Sign

MSB

LSB

Bit

Alarm window upper boundary temperature

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