AMC7812SPAPR datasheet(45/92 Pages) TI

45 / 92 page

TemperatureData

(D1,D2,LT)

High-Threshold

(upperbound)

Low-Threshold

(lowerbound)

Low-ALRBit

High-ALRBit

CH -ALRBit

thAnalogInput

( =0to3)

High-Threshold-

(upperbound)

Low-Threshold-

(lowerbound)

AMC7812

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SBAS513E – JANUARY 2011 – REVISED SEPTEMBER 2013

Analog Input Out-of-Range Alarm

The AMC7812 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 Low-Threshold defines the lower bound. These two bounds

specify a window for the out-of-range detection.

Figure 95. CHn Out-of-Range Alarm

The AMC7812 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).

Figure 96. Temperature Out-of-Range Alarm

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AMC7812SPAPR Datasheet(PDF) 45 Page - Texas Instruments