Texas Instruments AMC7832EVM, Руководство пользователя, Страница: 19 / 33

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AMC7832EVM Software Overview
19 SLAU544A – February 2014 – Revised September 2016
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AMC7832EVM User’s Guide
Figure 19. Enable Low Limit and High Limit Fields
The Write Settings button is used to write the values from the Low Limit and High Limit fields into the
device. The Read Alarm button is used to read the state of the active channels. When an alarm is
triggered, the Alarm Status will display the text ‘Tripped’ in red. If the channel values are within the range
of the alarm thresholds the status will display ‘No Alarm’ in black text.
Figure 20 displays the False Alarm protection, CH-FALR-CT drop-down list, which contains integer values
that are related to the consecutive number of samples required for the alarm to activate. The list defaults
to 16 consecutive samples, and therefore requires 16 conversions with an over range value before the
alarm is triggered.
Figure 20. CH-FALR-CT Menu
The CLR, ALARM OUT, and DACs to CLR column, as shown in Figure 21 , allow the user to tie DAC
output behavior to alarm events. By selecting the CLR checkbox, the alarm events are able to force the
DACs into a clear state, regardless of which DAC operation mode is active, auto or manual. The DAC
channels to clear are selectable under the DACs to CLR column.
Figure 21. Clear DAC Options
The ALARM OUT checkbox allows the device to create an external signal on GPIO1 that goes low (active)
when an alarm event is detected. The general-purpose I/O, more specifically GPIO1 must be configured
for ALARMOUT for this function to take effect.
The ALARMIN-ALR checkbox gives the user the ability to clear the DACs with an active low input signal
through GPIO0. Just as with GPIO1, GPIO0 must be configured for ALARMIN for this function to take
effect.