STTS2002 datasheet(21/52 Pages) STMICROELECTRONICS

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STTS2002

Temperature sensor registers

Doc ID 15389 Rev 5

21/52

Figure 8.

Hysteresis

TH = Value stored in the alarm temperature upper boundary trip register

TL = Value stored in the alarm temperature lower boundary trip register

HYS = Absolute value of selected hysteresis

10:9

Hysteresis enable (see Figure 8 and Table 10)

– 00 = Hysteresis is disabled (default)

– 01 = Hysteresis is enabled at 1.5 °C

– 10 = Hysteresis is enabled at 3 °C

– 11 = Hysteresis is enabled at 6 °C

Hysteresis applies to all limits when the temperature is dropping below the threshold so that once the

temperature is above a given threshold, it must drop below the threshold minus the hysteresis in order to be

flagged as an interrupt event. Note that hysteresis is also applied to the EVENT pin functionality. When

either of the lock bits is set, these bits cannot be altered.

15:11

Reserved for future use. These bits will always read ‘0’ and writing to them will have no effect. For

future compatibility, all RFU bits must be programmed as ‘0’.

As this device is used in DIMM (memory modules) applications, it is strongly recommended that only the active-low polarity

(default) is used. This will provide full compatibility with the STTS424E02. This is the recommended configuration for the

STTS2002.

The actual incident causing the event can be determined from the read temperature register. Interrupt events can be

cleared by writing to the clear event bit (writing to this bit will have no effect on overall device functioning).

Writing to this register has no effect on overall device functioning in comparator mode. When read, this bit will always

return a logic '0' result.

Table 9.

Configuration register bit definitions (continued)

Bit

Definition

Below Window bit

Above Window bit

TH - HYS

TL - HYS

AI12270

Table 10.

Hysteresis as applied to temperature movement

Below alarm window bit

Above alarm window bit

Temperature slope

Temperature

threshold

Temperature slope

Temperature

threshold

Sets

Falling

TL - HYS

Rising

Clears

Rising

Falling

TH - HYS

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