AMC7812B_14 Datasheet, PDF (45/93 Pages) Texas Instruments – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors

AMC7812B
www.ti.com
SBAS625A – SEPTEMBER 2013 – REVISED SEPTEMBER 2013
Analog Input Out-of-Range Alarm
The device provides out-of-range detection for four individual analog inputs (CH0, CH1, CH2, and CH3), as
shown in Figure 95. When the measurement is out-of-range, the corresponding alarm bit in the status register is
set to '1' to flag the out-of-range condition. The value in the high-threshold register defines the upper bound
threshold of the Nth analog input, while the value in the low-threshold register defines the lower bound. These
two bounds specify a window for the out-of-range detection.
High-Threshold-n
Register
(upper bound)
nth Analog Input
(n = 0 to 3)
CHn-ALR Bit
Low-Threshold-n
Register
(lower bound)
Figure 95. CHn Out-of-Range Alarm
The device also has high-limit or low-limit detection for the temperature sensors (D1, D2, and LT), as shown in
Figure 96. To implement single, upper-bound threshold detection for analog input CHn, 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. Note that the value of the high-threshold register must not be less
than the value of the low-threshold register; otherwise, ALR-n is always set to '1' and the alarm indicator is
always active. Each temperature sensor has two alarm bits: High-ALR (high-limit alarm) and Low-ALR (low-limit
alarm).
High-Threshold
(upper bound)
High-ALR Bit
Temperature Data
(D1, D2, LT)
Low-Threshold
(lower bound)
Low-ALR Bit
Figure 96. Temperature Out-of-Range Alarm
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