SA56004HD,118【PDF 11/43 页】IC TEMP SENSOR DIGITAL 8SOIC

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Sheet目录46

7页 8页 9页 10页 [11页]12页 13页 14页 15页

SA56004X

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Product data sheet

Rev. 7 25 February 2013

11 of 43

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 9

. 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 8.

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

bit assignments

&continued

Bit

Description

POR state

Table 9.

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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