AMC7832 Datasheet, PDF (34/70 Pages) Texas Instruments – AMC7832 12-Bit Analog Monitor and Control Solution with Multi-Channel ADC, Bipolar DACs, Temperature Sensor and GPIO Ports

AMC7832
SLAS836 – MARCH 2014
www.ti.com
8.3.2.4.1 Unipolar Inputs Out-of-Range Alarms
The AMC7832 provides out-of-range detection for the five external unipolar ADC inputs (LV_ADC12 to
LV_ADC16, terminals 41 - 45). When the measurement is out-of-range, the corresponding alarm bit in the Alarm
Status 0 register (address 0x70) is set to '1' to flag the out-of-range condition. The values in the ADC Upper and
Lower Threshold registers (address 0x80 – 0x93) define the upper and lower bound thresholds for all five inputs.
ADCn-Upper-Thresh
Value
-
(upper bound)
+
LV_ADCn
Conversion Value
(n = 12 to 16)
ADCn-ALR Bit
-
ADCn-Lower-Thresh
Value
+
(lower bound)
Figure 48. Unipolar Inputs Out-of-Range Alarms
8.3.2.4.2 Internal Temperature Sensor Out-of-Range Alarms
The AMC7832 includes high-limit and low-limit detection for the internal temperature sensor. The values in the
LT Upper and Lower Threshold registers (address 0x94 – 0x97) set the limits for the temperature sensor. The
temperature sensor detector can issue either a high-alarm (LT-HIGH-ALR bit) or a low-alarm (LT-LOW-ALR bit)
in the Alarm Status 1 register (address 0x71) depending on whether the high or low thresholds were exceeded.
To implement single, upper-bound threshold detection for the temperature sensor, 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.
In addition to the programmable threshold alarms the temperature sensor detection circuit also includes a die
thermal alarm flag which continuously monitors the die temperature. When the die temperatures exceeds +150˚C
the die thermal alarm flag (THERM-ALR bit) in the Alarm Status 1 register (address 0x71) is set. The internal
temperature sensor must be enabled for this alarm to be functional.
Temperature
High Threshold
-
(upper bound)
+
LT-HIGH-ALR Bit
Temperature
Data
150°C
-
+
THERM-ALR Bit
-
Temperature
Low Threshold
+
(lower bound)
LT-LOW-ALR Bit
Figure 49. Internal Temperature Out-of-Range Alarms
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