NXP Semiconductors UM11579, Руководство пользователя

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NXP Semiconductors
UM11579
PCA9957HN-ARD evaluation board
8.2 Global
Figure 11. Graphical interface – Global tab activated
The Global tab contains two secondary tabs: Brightness and Gain (marked with a red
arrow)
Brightness
Global LED brightness is determined by bit settings in the PWMALL register (#6Ah).
The Global tab allows the PWMALL register value to be changed by the GUI. The
Brightness tab opens with default values for the register. Register values can be
changed by toggling the green boxes that represent individual register bits or by directly
entering the new value in the Hex or Dec text box. The changes take affect when the
Write button is clicked.
Gain
Output gain is determined by bit settings in the IREFALL register (#6Bh). The Gain tab
(depicted in Figure 11 ) allows the IREFALL register value to be changed by the GUI.
Register values can be changed by toggling the green boxes that represent individual
register bits or by directly entering the new value in the Hex or Dec text box. The
changes take affect when the Write button is clicked.
8.3 Channels
Activating the Channels tab brings up the display shown in Figure 12 . The red arrows
show the main tab and the default secondary Brightness tab. Table 4 shows the names
and HEX addresses of all the secondary tabs registers available under the Channels
main tab. The registers can be set individually with Write button or globally by clicking the
WriteAll button. The Read button loads data from the registers into the GUI.
Tab Picture in Register name Register HEX Remarks
Brightness Figure 12 PWMx #27h Read / Write / Write All
Table 4. Secondary tabs under Channels
UM11579 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved.
User manual Rev. 1 — 25 February 2021
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