Datasheet

PGA400 EVM User Guide
TI CONFIDENTIAL – NDA Restrictions
Page 26 of 50
7.1 ADC Conversion Result Section of the GUI
In the bottom right corner of the GUI is dedicated for functions that support or directly read from
the internal ADC inside the PGA400-Q1. These buttons were not put inside a tab like the rest of
the buttons because it is useful to be able to read the ADC registers which modifying the AFE
settings without having to switch tabs. An image along with a description of the buttons can be
found below.
Figure 19. ADC Conversion Result Section of GUI
7.1.1 ADC Update
The “ADC Update” button is used to load the contents of the ADC into the shadow register and
then read them into the GUI. The ADC Update button will load the output from the decimator
that is selected with the “ADC Decimator Output Select” combo-box. Results are displayed in
both two’s complement and signed decimal.
7.1.2 ADC Decimator Output Select
The “ADC Decimator Output Select” combo-box is used to control with ADC decimator output is
loaded when the “ADC Update” button is pressed. The combo-box controls bits 0-2 in ESFR
0xB3.
7.1.3 ADC DC Level Shift
The “ADC DC Level Shift” button controls bit 5 in ESFR 0xA9.
7.1.4 Internal Temp Sensor
The “Internal Temp Sensor” button controls bit 4 in ESFR 0xA9.
7.2 AFE/Offset Tab
By default, the AFE/Offset tab is displayed in the right side of the GUI. This tab is divided into
two parts. The first enables and controls either the resistive or capacitive AFEs, the second
manipulates the shared “Offset DACs” in the PGA400-Q1. The buttons on these tabs are
described in the following sections