SA56004GD datasheet(9/36 Pages) NXP

9 / 36 page

SA56004X_5

Product data sheet

Rev. 05 — 22 May 2008

9 of 36

NXP Semiconductors

SA56004X

Digital temperature sensor with overtemperature alarms

7.8.4 Status register (SR)

The contents of the status register reﬂect condition status resulting from all activities:

comparison between temperature measurements and temperature limits, the status of

A/D conversion, and the hardware condition of external diode to the device. Bit

assignments are listed in Table 8. This register is read-only and its address is 02h. Upon

POR, all bits are set to zero.

Remark: Any one of the fault conditions, with the exceptions of Diode OPEN and

A/D BUSY, introduces an Alert interrupt (see Section 7.9.1.2). Also, whenever a one-shot

command is executed, the status byte should be read after the conversion is completed,

which is about 38 ms (1 conversion time period) after the one-shot command is sent.

Local T_CRIT mask.

The T_CRIT output will be activated by a local temperature that exceeds

the local T_CRIT setpoint when this bit is LOW. The T_CRIT output will not

be activated under this condition when this bit is HIGH.

Not deﬁned; defaults to logic 0.

Fault queue.

A single remote temperature measurement outside the HIGH, LOW or

T_CRIT setpoints will trigger an outside limit condition resulting in setting

the status bits and associated output pins when this bit is LOW. Three

consecutive measurements outside of one of these setpoints are required

to trigger an outside of limit condition when this bit is HIGH.

Table 7.

CON - Conﬁguration register (read address 03h; write address 09h)

bit assignments …continued

Bit

Description

POR state

Table 8.

SR - Status register (read-only address 02h) bit assignments

Bit

Name

Description

BUSY

When logic 1, A/D is busy converting. POR state = n/a.

LHIGH

When logic 1, indicates local HIGH temperature alarm. POR state = 0.

LLOW

When logic 1, indicates a local LOW temperature alarm. POR state = 0.

RHIGH

When logic 1, indicates a remote diode HIGH temperature alarm. POR state = 0.

RLOW

When logic 1, indicates a remote diode LOW temperature alarm. POR state = 0.

OPEN

When logic 1, indicates a remote diode disconnect. POR state = 0.

RCRIT

When logic 1, indicates a remote diode critical temperature alarm. POR state = 0.

LCRIT

When logic 1, indicates a local critical temperature alarm. POR state = 0.

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