AMC7834 Datasheet, PDF (42/93 Pages) Texas Instruments – AMC7834 12-Bit Integrated Power-Amplifier Monitor and Control System with Temperature, Current and Voltage Supervision Capabilities

AMC7834
SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016
www.ti.com
7.3.6.3 Temperature Sensors Out-of-Range Alarm
The AMC7834 device also includes high-limit or low-limit detection for the temperature sensors. Figure 57 shows
the temperature detection block. The values in the temperature sensors upper and lower threshold registers
(address 0x48 through 0x4D) set the limits for the temperature sensors. The temperature sensors can issue
either a high alarm (HIGH-ALARM bit) or a low alarm (LOW-ALARM bit) in the alarm status register (address
0x1E) depending on whether the high or low thresholds were exceeded. To implement single, upper-bound
threshold detection for the temperature sensors, the host processor can set the upper-bound threshold to the
desired value and the lower-bound threshold to the default value. For lower-bound threshold detection, the host
processor can set the lower-bound threshold to the desired value and the upper-bound threshold to the default
value.
(RT1, RT2, LT)
High Threshold
(upper bound)
±
HIGH-ALARM Bit
+
Temperature
Data
(RT1, RT2, LT)
(RT1, RT2, LT)
Low Threshold
(lower bound)
±
LOW-ALARM Bit
+
Figure 57. Temperature Out-of-Range Alarm
7.3.6.4 Bipolar DACs High Alarm
The AMC7834 device includes configurable upper-limit detection for the bipolar DACs in closed-loop mode.
Figure 58 shows the alarm detection block. The values in the bipolar DAC upper threshold registers (address
0x4E through 0x4F) set a limit other than full-scale limit for the bipolar DACs. When a closed-loop controller
attempts to set its bipolar DAC to a value exceeding the corresponding upper-threshold register, the DAC is
instead updated with the threshold value and a DAC high-alarm is issued in the alarm status register.
DACn Upper Threshold
(n = 1 to 4)
±
DACn Data Register
+
(n = 1 to 4)
DACn-HIGH-ALARM
Figure 58. Bipolar DAC High Alarm
7.3.6.5 AV_SS Detection Alarm
The device continuously monitors the AV_SS supply to ensure it is within the required operating threshold. By
setting the PAON_AVSS bit to 1 in the AMC configuration 1 register (address 0x11) the AV_SS alarm can be set to
automatically set the PA_ON pin to the OFF state and prevent it from getting configured back to the ON state
unless the AV_SS alarm has been cleared.
7.3.6.6 AV_DD Detection Alarm
The device continuously monitors the AV_DD supply to ensure it is within the required operating threshold. An
AV_DD alarm initiates a POR event which sets the PA_ON pin to the OFF state, bipolar DACs to the AV_SS clamp
mode and auxiliary DACs to clamp mode.
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