Data Capture Page - Texas Instruments ADS7042EVM-PDK User Manual

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Figure 15 shows the Data Capture page of the EVM GUI. The device SCLK frequency and capture
settings can be configured at the top right hand corner of the Data Capture page. Changes made to the
configuration settings are executed on pressing the Capture button. The following list describes the
different options available on the Data Monitor page.
• SCLK: This control sets the clock frequency used by the SPI interface to capture data. By configuring
the SCLK frequency, the sampling rate of the ADS7042 is set. The ADS7042EVM-PDK software
supports SCLK frequencies of 3.2 MHz to 16 MHz. In case the input in this field is beyond the
capability of the device, it will be adjusted to the nearest value that can be supported.
• Sampling Rate: The upper limit of the sampling rate (displayed in ksps) is set based on the SCLK
frequency selected. However, sampling rates lower than this displayed value may be set. The GUI
supports these lower rates by increasing the CS high time between frames. Details of the interface
protocol can be studied in the serial interface timing diagrams in the ADS7042 datasheet (SBAS608).
In case the input to this field is beyond the capability calculated based on SCLK, it will be constrained
to the maximum sampling rate possible at that SCLK frequency.
• Sample Count: This option is used to select the number of contiguous samples captured in a block.
The drop-down menu can be used to select a data block in the range of 1024 samples to 1,048,576
samples per channel. The interface provides a drop-down list for values restricted to 2n, where n is an
integer.
Once the ADC data is captured by the GUI using either of the Capture buttons, it is displayed on the
graph area on this tab as shown in
resized by using the controls at the bottom of the graph area. The data captured may also be transferred
to a file for further analysis by right clicking on the body of the graph and using the various options listed
under Export.
SBAU234A – October 2014 – Revised November 2014
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Figure 15. Data Capture Page
Figure 15. Once plotted, the graph can be zoomed into, panned, or
Copyright © 2014, Texas Instruments Incorporated
ADS7042EVM-PDK Kit Operation
ADS7042EVM-PDK
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