NXP Semiconductors PCA9955BTW-ARD, Руководство пользователя, Страница: 21 / 38

NXP Semiconductors
UM11761
PCA9955BTW-ARD evaluation board
Note 2: Due to high complexity of the internal register map and functions of PCA9955B
IC, for proper operation and testing of the daughterboard from GUI application, the user
should read in detail the datasheet of PCA9955B IC.
7.1 Settings tab
Figure 11. Graphical interface at start-up (“SETTINGS” tab activated by default)
The GUI application starts with Settings tab (marked in Figure 11 with red up arrow).
In the right side of the blue region are located two read-only flags mapped in “MODE2”
register (#01h). The FAULT flag indicates that the PCA9955BTW-ARD’s internal
controller has detected an LED output error (no load, short). The OVERTEMP flag
indicates that the PCA9955B die temperature exceeds its specified limit (see the
PCA9955B datasheet, Section 7.3.15 “LED error detection” and Section 7.3.16
“Overtemperature protection”).
The LED indicators on the GUI are indicating the status of the on-board LEDs (marked in
Figure 11 with red left arrow).
Below the LED indicators are three sections: Board Setting on the left, Device Setting
in the middle, and General Setting on the right.
Board Setting parameters are:
• Select EVK: displays the list of EVKs. Selecting a wrong EVK board causes the
connection to fail and a pop-up window with the message:
“Unable to Connect with
EVK”
appears on the screen.
• Select COM port: displays port selected for the communication. The port is
automatically selected by the system and is shown here as COM5 .
• Select Board:
allows the user to select the correct daughterboard (the application can
support three different boards). In Figure 11 the selected board is
PCA9955B
.
Assuming the correct parameters are chosen, clicking the
Connect
button establishes
the connection with the EVK. In the bottom side of the GUI window a status bar shows in
real time the status regarding connection between PC and the EVK.
Device Setting
parameters are:
UM11761 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 18 March 2022
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