AMC7834 Datasheet, PDF (41/93 Pages) Texas Instruments – AMC7834 12-Bit Integrated Power-Amplifier Monitor and Control System with Temperature, Current and Voltage Supervision Capabilities

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AMC7834
SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016
The ALARMOUT status can be configured to automatically clamp specific DACs or set the PA_ON signal to the
OFF state. The ALARMOUT clamp register selects the DAC or DAC pairs that enter the clamp mode as well as
the PA_ON behavior when the ALARMOUT pin is active. Clearing the alarm events does not automatically bring
the DAC or DAC pairs back to normal operation or return the PA_ON to the ON state.
7.3.6.1 ADC Internal Monitoring Input Out-of-Range Alarm
The AMC7834 device can provide out-of-range detection for the four internal ADC inputs monitoring the bipolar
DAC outputs when operating in closed-loop mode. The ADCINT/CS-SELECT bit in register 0x1B must be
cleared to 0 to enable out-of-range detection on the internal ADC inputs.
Figure 55 shows the out-of-range detection block. When the measurement is out-of-range, the corresponding
alarm bit in the alarm status register is set to 1 to flag the out-of-range condition. The values in the
ADCINTn/CSn upper and lower threshold registers (address 0x40 through 0x47) define the upper- and lower-
bound thresholds for these inputs when the ADCINT/CS-SELECT bit in the ALARMOUT configuration register
(address 0x1B) is cleared to 0.
ADCINTn-Upper-
Threshold Value
±
(upper bound)
+
DACn Monitoring
Input
(n = 1 to 4)
ADCINTn-
ALARM
±
ADCINTn-Lower-
Threshold Value
+
(lower bound)
Figure 55. ADC Monitoring Out-of-Range Alarm
7.3.6.2 Current-Sense Out-of-Range Alarm
The AMC7834 device is capable of providing out-of-range detection for the four current-sense inputs when
operating in open-loop mode. The current-sense out-of-range detection is only active if the ADCINT/CS-SELECT
bit in register 0x1B is set to 1.
Figure 56 shows the current sense detection block. When the measurement is out-of-range, the corresponding
alarm bit in the alarm status register is set to 1 to flag the out-of-range condition. The values in the
ADCINTx/CSx upper and lower threshold registers (address 0x40 through 0x47) define the upper- and lower-
bound thresholds for these inputs when the ADCINT/CS-SELECT bit in the ALARMOUT configuration register
(address 0x1B) is set to 1.
CSn-Upper-Threshold
Value
±
(upper bound)
+
Current Sense
Input CSn
(n = 1 to 4)
ADCINTn-
ALARM
±
CSn-Lower-Threshold
Value
+
(lower bound)
Figure 56. Current-Sense Out-of-Range Alarm
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