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SA56004HD Datasheet(PDF) 9 Page - NXP Semiconductors |
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SA56004HD Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 36 page  SA56004X_5 © NXP B.V. 2008. All rights reserved. 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. 2 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. 0 1 Not defined; defaults to logic 0. 0 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. 0 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 7 BUSY When logic 1, A/D is busy converting. POR state = n/a. 6 LHIGH When logic 1, indicates local HIGH temperature alarm. POR state = 0. 5 LLOW When logic 1, indicates a local LOW temperature alarm. POR state = 0. 4 RHIGH When logic 1, indicates a remote diode HIGH temperature alarm. POR state = 0. 3 RLOW When logic 1, indicates a remote diode LOW temperature alarm. POR state = 0. 2 OPEN When logic 1, indicates a remote diode disconnect. POR state = 0. 1 RCRIT When logic 1, indicates a remote diode critical temperature alarm. POR state = 0. 0 LCRIT When logic 1, indicates a local critical temperature alarm. POR state = 0. |
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