3.2.1
Color Picker
3.2.2
Patterns
3.2.3
Dot Correction
3.2.4
Timing Control
3.2.5
Anti-Ghosting
Operation
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This window allows the user to choose the red, green, and blue PWM value for each LED. The software
provides three options for choosing an LED’s color. The user can manually enter the PWM values into the
three text boxes, use the mouse to pick colors from the color bars, or use the mouse to click on a color
from the custom color pallet. The color chosen in the Color Picker window is immediately displayed in the
LEDs that are highlighted in the LED Frames window. The user can add custom colors to the pallet by
dragging the current color to the custom color pallet. Custom colors can be deleted by right-clicking on the
color to be removed. The TLC5944 is capable of displaying the full 2
12
, or 4096 brightness levels per LED.
This window provides the user with several preprogrammed LED frame patterns. Choosing a pattern
immediately programs the LED Frames window with the pattern and then displays the pattern with the
LEDs.
These two windows allow the user to individually control the EVM’s red, green, and blue dot correction
values. Each LED’s Dot Correction value can be individually programmed. Dot Correction data is only
written to the EVM when one of the three values change. To change an LED’s dot correction value, select
individual LEDs by clicking on each LED or select all LEDs by checking the box to the left of the LEDs.
Then adjust the Dot Correction value. The programmed Dot Correction value is used for all frames. Dot
Correction values can not be changed from frame to frame.
The options in this window allow the user to modify the timing parameters of the signals written to the
TLC5944 ICs. Note that all times and frequencies are approximate.
Clock:
This drop-down menu allows the user to select the EVM’s serial clock (SCLK) and grayscale
(GSCLK) frequencies. The available clock frequencies are integral divisions of the 'F2808 clock frequency
and cannot be modified.
Frame Rate:
This shows the refresh rate for a single frame update. The Frame Rate is approximately
1/period, where period is the time to display all 2
12
grayscale pulses at the chosen clock frequency plus
the time the BLANK signal is high.
BLANK Width:
This adjusts the width of the BLANK pulse.
XLAT Width:
This adjusts the width of the XLAT pulse.
XLAT Location:
This adjusts the rising edge of the XLAT pulse location. It is relative to the rising edge of
the BLANK signal. A negative XLAT Location is shown when the XLAT signal rises before the BLANK
signal.
Default Values
: This box resets all Timing Controls to their default values.
When not checked, the EVM does not supply power to the TLC5944 VUP pins. This allows the LEDs to
show ghosting in the ghosting demo. When checked, the EVM applies power to the TLC5944 VUP pins
which enables the Pre-Charge FETs to eliminate the visible ghosting.
TLC5944EVM-358
8
SLVU306 – April 2009
