STTS2002B2DN3F datasheet(25/52 Pages) STMICROELECTRONICS

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STTS2002

Temperature sensor registers

Doc ID 15389 Rev 5

25/52

A 0.25 °C minimum granularity is supported in all registers. Examples of valid settings and

interpretation of temperature register bits for 10-bit (0.25 °C) default resolution are provided

in Table 13.

4.4

Temperature trip point registers (read/write)

The STTS2002 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 STTS2002 has three temperature trip point registers (see Table 15):

●

Alarm temperature upper boundary threshold (Table 16),

●

Alarm temperature lower boundary threshold (Table 17), and

●

Critical temperature trip point value (Table 18).

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 coding examples (for 10 bits)

B15:B0 (binary)

Value

Units

xxx0 0000 0010 11xx

+2.75

°C

xxx0 0000 0001 00xx

+1.00

°C

xxx0 0000 0000 01xx

+0.25

°C

xxx0 0000 0000 00xx

°C

xxx1 1111 1111 11xx

–0.25

°C

xxx1 1111 1110 00xx

–1.00

°C

xxx1 1111 1101 11xx

–2.25

°C

Table 14.

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 above 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.

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