STTS2004 datasheet(22/58 Pages) STMICROELECTRONICS

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Temperature sensor registers

STTS2004

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Alarm window lock bit

– 0 = Alarm trips are not locked and can be altered (this is the default).

– 1 = Alarm trip register settings cannot be altered. This bit is initially cleared. When set, this bit returns a

logic '1' and remains locked until cleared by an internal power-on reset. These bits can be written to with

a single WRITE, and do not require double WRITEs.

Critical trip lock bit

– 0 = Critical trip is not locked and can be altered (this is the default).

– 1 = Critical trip register settings cannot be altered. This bit is initially cleared. When set, this bit returns a

logic '1' and remains locked until cleared by an internal power-on reset. These bits can be written to with

a single WRITE, and do not require double WRITEs.

Shutdown mode

– 0 = TS is enabled, continuous conversion (this is the default).

– 1 = Shutdown TS when the shutdown, device, and A/D converter are disabled in order to save power. No

event conditions will be asserted; when either of the lock bits (bit6 or bit7) is set, then this bit cannot be

altered until it is unlocked. It can be cleared at any time.

10:9

Hysteresis enable (see Figure 8 and Table 11)

– 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’.

1. 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 STTS2002. This is the recommended configuration for the

STTS2004.

2. 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).

3. 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 10. Configuration register bit definitions (continued)

Bit

Definition

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