AMC7812SPAPR Datasheet, PDF (44/92 Pages) Texas Instruments – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors

AMC7812
SBAS513E – JANUARY 2011 – REVISED SEPTEMBER 2013
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Alarm Operation
The AMC7812 continuously monitors all analog inputs and temperatures in normal operation. When any input is
out of the specified range, an alarm triggers. When an alarm state occurs, the corresponding individual alarm bit
in the Status Register is set ('1'). Global alarm bit GALR in AMC Configuration Register 0 is the OR of individual
alarms, see Figure 94. When the ALARM-LATCH-DIS bit in the Alarm Control Register is cleared ('0'), the alarm
is latched. The global alarm bit (GALR) maintains '1' until the corresponding error condition[s] subside and the
alarm status is read. The alarm bits are referred to as being latched because they remain set until read by
software. This design ensures that out-of-limit events cannot be missed if the software is polling the device
periodically. All bits are cleared when reading the Status Register, and all bits are reasserted if the out-of limit
condition still exists on the next monitoring cycle, unless otherwise noted.
Alarm
Status
Bits
CH0-ALR
THERM-ALR
GALR Bit
Figure 94. Global Alarm Bit
When the ALARM-LATCH-DIS bit in the Alarm Control Register is set ('1'), the alarm bit is not latched. The alarm
bit in the Status Register goes to '0' when the error condition subsides, regardless of whether the bit is read or
not. When GALR = '1', the ALARM pin goes low. When the GALR bit = '0', the ALARM is high (inactive).
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