STTS2004 datasheet(20/58 Pages) STMICROELECTRONICS

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Temperature sensor registers

STTS2004

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DocID024229 Rev 3

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 9 on page 21 and Table 10 on page 21).

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

The 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 STTS2004 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 the shutdown bit (bit 8) to '1'. In this mode, the devices consume the

minimum current (ISHDN), as shown in Table 30 on page 44.

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.

If the device is shut down while the EVENT pin is asserted, then the Event output will be de-

asserted during shutdown. It will remain de-asserted until the device is enabled for normal

operation. Once the device is enabled, it takes tCONV before the device can re-assert the

Event output.

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