Texas Instruments AMC7834, User Manual, Page: 16 / 32

AMC7834EVM Software Overview
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16 SLAU608B – December 2014 – Revised May 2016
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AMC7834 Evaluation Module
Figure 14. ADC Channel MUX
The Conversion Mode is selectable in the ADC Controls ADC Block Diagram.
If choosing Direct Mode , a Start Conv is required to update every new read. In Direct Mode , the analog
inputs enabled in the ADC MUX register are converted sequentially one time. When one set of
conversions is complete, the ADC is idle and waits for a new trigger. Conversions are triggered by
pressing the
Start Conv button or can automatically be triggered by enabling the Auto-convert? check box.
The ADC data registers, displayed on the right side of the GUI, are updated with the converted results
when the
Read button is pressed. These controls are illustrated in Figure 15 .
Figure 15. ADC Channel MUX
If choosing Auto Mode , the Start Conv button must be pressed to start the auto conversion process. The
analog inputs that are enabled in the ADC MUX register are converted sequentially and repeatedly. When
one set of conversions is complete, the ADC multiplexer returns to the first channel and repeats the
process. Stop the auto conversion process by pressing
Start Conv button again.
In both modes, the state of the 12-Bit ADC is viewable from the 12-Bit ADC field displayed in the ADC
Controls Block. If the ADC is in the OFF state, then ensure that the ADC block is configured in the
Powerdown Mode drop-down menu. If the ADC is in the IDLE state, press the Start Conv button for ADC
conversion and register readout. While converting, the 12-Bit ADC indicator turns yellow and displays the
text CNVT . These different ADC states are displayed in Figure 16 .
Figure 16. ADC Controls Block
An ADC Chart is included in the ADC page to keep a history of the contents of the data registers (see
Figure 17 ). Pressing the (Auto) Read button starts the ADC Chart to periodically read the ADC data
registers. If in Direct Mode , the chart automatically issues a software conversion before every read. In
Auto Mode , ensure that all input channels are enabled in the ADC MUX block and press the Start Conv
button before starting the (Auto) Read . The contents of the chart can be copied into Microsoft
®
Excel
®
by
right clicking on the chart and selecting Export Data to Excel .