Texas Instruments ADS131M04, User Manual, Page: 16 / 34

1. Information Area
2. Pages
4. Interface
Configuration
5. Clock and
Sampling Rate
3. Single
Commands
ADS131M04EVM Operation
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16 SBAU332A – March 2019 – Revised June 2019
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Copyright © 2019, Texas Instruments Incorporated
ADS131M04 Evaluation Module
6.1 EVM GUI Global Settings for ADC Control
Although the EVM GUI does not allow direct access to the levels and timing configuration of the ADC
digital interface, the EVM GUI does give users high-level control over virtually all functions of the
ADS131M04 including interface modes, sampling rate, and number of samples to be captured.
Figure 12
identifies the input parameters of the GUI (as well as their default values) through which the various
functions of the ADS131M04 can be exercised.
Figure 12. EVM GUI Global Input Parameters
There are four pages available in the ADS131M04EVM GUI. The information area displays the results of
each of the pages. Each of these pages display a different control or measurement of the device. The
Register Map Config page is used to read and write to the registers of the device. The Time Domain
Display page is used to collect a set of data from the device and display the result. The Spectral Analysis
page can determine the FFT of the collected data, and the Histogram Analysis page shows a histogram of
the collected data and displays basic statistics of the result.
The Single Commands section allows for direct control of the device for three basic functions. First the
Reset button sends a signal to the SYNC/RESET pin to reset the device. The Standby button puts the
device into a low-power state in which all channels are disabled, and the reference and other non-
essential circuitry are powered down. The
Wakeup button exits the standby mode.
The Interface Configuration options in this pane allows the user to choose from different frame word sizes
available on the ADS131M04. This section also sets the data rate by setting the oversampling ratio (OSR)
in the ADC. Finally, this section may used to set the power modes in the registers. The ADS131M04 can
be set to high-resolution, low power, and very-low power modes in conjunction with the jumper settings of
JP6 for the CLKIN pin, as outlined in
Table 4 . This information is also discussed in Section 2.2 .
The Clock and Sampling Rate section allows the user to specify a target SCLK frequency (in Hz) and the
GUI tries to match this frequency as closely as possible by changing the PHI PLL settings, but the
achievable frequency may differ from the target value entered. This section also displays the sampling
rate of the ADC as controlled by the OCR.
The GUI is switched between hardware mode and simulation mode by checking and unchecking the
Connected to Hardware box in the top right area of the screen at any time.