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ADS8634
ADS8638
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SBAS541A –MAY 2011– REVISED AUGUST 2011
Alarm Flag Registers for the ADS8634 (Read-Only)
The alarm conditions related to individual channels are stored in these registers. When an alarm interrupt is
received, the flags can be read on the AL_PD pin. There are two types of flag for every alarm: active and tripped.
An active alarm flag is enabled when an alarm is triggered (when data cross the alarm threshold) and remains
enabled as long as the alarm condition persists. A tripped alarm flag is enabled in the same manner as an active
alarm flag, but it remains latched until it is read. This feature relieves the device from having to track alarms.
Temp Flag: Alarm Flags Register for the Temperature Sensor (Address = 20h; Page 0)
7 6 5 4 3 2 1 0
Tripped Alarm Flag Tripped Alarm Flag Active Alarm Flag Active Alarm Flag
0 0 0 0
Temperature Low Temperature High Temperature Low Temperature High
The Temp Flag register stores alarm flags for the temperature sensor. There are two alarm thresholds, with two
flags for each threshold. An active alarm flag is enabled when an alarm is triggered (when data cross the alarm
threshold) and remains enabled as long as the alarm condition persists. A tripped alarm flag is enabled in the
same manner as an active alarm flag, but it remains latched until it is read.
Bit 7 Tripped Alarm Flag Temperature Low
This bit indicates the tripped low alarm flag for the temperature sensor.
0 = No alarm detected
1 = Alarm detected
Bit 6 Tripped Alarm Flag Temperature High
This bit indicates the tripped high alarm flag for the temperature sensor.
0 = No alarm detected
1 = Alarm detected
Bit 5 Active Alarm Flag Temperature Low
This bit indicates the active low alarm flag for the temperature sensor.
0 = No alarm
1 = Alarm detected
Bit 4 Active Alarm Flag Temperature High
This bit indicates the active-high alarm flag for the temperature sensor.
0 = No alarm detected
1 = Alarm detected
Bits[3:0] Always read '0'
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