STTS2002_11 datasheet(19/52 Pages) STMICROELECTRONICS

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STTS2002

Temperature sensor registers

Doc ID 15389 Rev 5

19/52

4.2

Configuration register (read/write)

The 16-bit configuration register stores various configuration modes that are used to set up

the sensor registers and configure according to application and JEDEC requirements (see

Table 8 on page 19 and Table 9 on page 20).

4.2.1

Event thresholds

All event thresholds use hysteresis as programmed in register address 0x01 (bits 10 through

9) to be set when they de-assert.

4.2.2

Interrupt mode

The interrupt mode allows an event to occur where software may write a '1' to the clear

event bit (bit 5) to de-assert the event Interrupt output until the next trigger condition occurs.

4.2.3

Comparator mode

Comparator mode enables the device to be used as a thermostat. READs and WRITEs on

the device registers will not affect the event output in comparator mode. The event signal will

remain asserted until temperature drops outside the range or is re-programmed to make the

current temperature “out of range”.

4.2.4

Shutdown mode

The STTS2002 features a shutdown mode which disables all power-consuming activities

(e.g. temperature sampling operations), and leaves the serial interface active. This is

selected by setting shutdown bit (bit 8) to '1'. In this mode, the devices consume the

minimum current (ISHDN), as shown in Table 30 on page 41.

Note:

Bit 8 cannot be set to '1' while bits 6 and 7 (the lock bits) are set to '1'.

The device may be enabled for continuous operation by clearing bit 8 to '0'. In shutdown

mode, all registers may be read or written to. Power recycling will also clear this bit and

return the device to continuous mode as well.

Table 8.

Configuration register format

Bit15

Bit14

Bit13

Bit12

Bit11

Bit10

Bit9

Bit8

RFU

Hysteresis Hysteresis

Shutdown

mode

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

Critical

lock bit

Alarm lock

bit

Clear

event

Event output

status

Event output

control

Critical

event only

Event

polarity

Event

mode

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