Datasheet

UG-254 Evaluation Board User Guide
Rev. A | Page 6 of 16
SOFTWARE OPERATION
FRONT PANEL
Figure 3 shows the main window of the AD7298 evaluation
software. The device is configurable via the CONTROL REGISTER
button. Samples can be taken continuously or one at a time,
depending on whether CONTINUOUSLY SAMPLE or
SAMPLE ADC is selected.
The lower section of the main window graphically displays the
AD7298 data. The tab setting in the data display window allows
the user to swap between displaying the ADC conversion results
or the internal temperature sensor results.
CONTROL REGISTER
Consult the control register section of the AD7298 data sheet
before configuring the control register settings. To configure the
control register, click CONTROL REGISTER.
When enabled, DB15/ WRITE ensures that the following 15 bits
are written to the control register (see Figure 4). If DB15/
WRITE is not selected, the remaining 15 bits are not loaded to
the control register, and the results remain unchanged. Selecting
DB14/ REPEAT enables the repeated conversion of the selected
sequence of channels. Select the ADC channels required for
conversion in the sequence by clicking the relevant button
(DB13 /CH0 to DB6/ CH7).
To enable the internal temperature sensor, select DB5/ TSENSE.
Selecting DB1/ TSENSE AVERAGE enables the temperature
sensor averaging function. When averaging is enabled, the
AD7298 internally computes a running average of the conversion
results to determine the final TSENSE result (refer to the AD7298
data sheet for additional information). Note that enabling the
averaging feature does not automatically select the TSENSE
channel for conversion, DB5/ TSENSE must also be selected.
Click WRITE to update the control register.
09711-004
Figure 4. Control Register