AMC7812B_15 Datasheet, PDF (70/92 Pages) Texas Instruments – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors

AMC7812B
SBAS625A – SEPTEMBER 2013 – REVISED SEPTEMBER 2013
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Status Register (Read-Only, Address = 4Fh, Default = 0000h)
The AMC7812B continuously monitors all analog inputs and temperatures during normal operation. When any
input is out of the specified range for N consecutive times, the corresponding alarm bit is set ('1'). If the input
returns to the normal range before N consecutive times, the corresponding alarm bit remains clear ('0'). This
configurations avoids any false alarms.
When an alarm status occurs, the corresponding alarm bit is set ('1'). When the ALARM-LATCH-DIS bit in the
alarm control register is cleared ('0'), the ALARM pin is latched. Whenever an alarm status bit is set, that bit
remains set until the event that caused the alarm is resolved and the status register is read. Reading the status
registers clears the alarm status bit. The alarm bit can only be cleared by reading the status register after the
event is resolved, or by hardware reset, software reset, or power-on reset. All alarm status bits are cleared when
reading the status register, and all these bits are reasserted if the out-of-limit condition still exists after the next
conversion cycle, unless otherwise noted.
When the ALARM-LATCH-DIS bit in the alarm control register is set ('1'), the ALARM pin is not latched. The
alarm bit goes to '0' when the error condition subsides, regardless of whether the bit is read or not.
Table 22. Status Register
BIT
NAME
DEFAULT R/W
DESCRIPTION
15
—
0
R Reserved. Writing to this bit causes no change. Reading this bit returns '0'.
0 = The analog input is not out of the specified range.
14
CH0-ALR
0
R 1 = The single-ended channel 0 or differential input pair (CH0+, CH1–) is out of the range
defined by the corresponding threshold registers.
0 = The analog input is not out of the specified range.
13
CH1-ALR
0
R 1 = The single-ended channel 1 is out of the range defined by the corresponding threshold
registers.
0 = The analog input is not out of the specified range.
12
CH2-ALR
0
R 1 = The single-ended channel 2 or differential input pair (CH2+, CH3–) is out of the range
defined by the corresponding threshold registers.
0 = The analog input is not out of the specified range.
11
CH3-ALR
0
R 1 = The single-ended channel 3 is out of the range defined by the corresponding threshold
registers.
Local temperature underrange flag.
10 LT-Low-ALR
0
0 = The local temperature is not less than the range.
R _{1 = The local temperature is less than the low-bound threshold.}
This bit is only checked when LT is enabled (EN-LT is '1'); this bit is ignored when EN-LT is
'0'.
Local temperature overrange flag.
9 LT-High-ALR
0
0 = The local temperature is not greater than the range.
R _{1 = The local temperature is greater than the high-bound threshold.}
This bit is only checked when LT is enabled (EN-LT is '1'); this bit is ignored when EN-LT is
'0'.
Remote temperature reading of D1 when less than the range flag.
8 D1-Low-ALR
0
0 = The local temperature is not less than the range.
R _{1 = The local temperature is less than the low-bound threshold.}
This bit is only checked when D1 is enabled (EN-D1 is '1'); this bit is ignored when EN-D1 is
'0'.
Remote temperature reading of D1 when greater than the range flag.
7 D1-High -ALR
0
0 = The local temperature is not greater than the range.
R _{1 = The local temperature is greater than the high-bound threshold.}
This bit is only checked when D1 is enabled (EN-D1 is '1'); this bit is ignored when EN-D1 is
'0'.
Remote temperature reading of D2 when less than the range flag.
6 D2-Low-ALR
0
0 = The local temperature is not less than the range.
R _{1 = The local temperature is less than the low-bound threshold.}
This bit is only checked when D2 is enabled (EN-D2 is '1'); this bit is ignored when EN-D2 is
'0'.
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