UM10572
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1 — 7 June 2012
13 of 16
NXP Semiconductors
UM10572
PCA9955 demonstration board OM13330
8.2 Color mixing and blinking LEDs
To set up a blinking demo, repeat step 1 through step 7 as in
Section 8.1
, then do the
following:
1. In the Mode 2 (= 0x25) selection window (middle left), check the
‘Group control = dimming’ box to change the mode to ‘Group control = blinking’.
2. To set a blink cycle, click the ‘Other’ configuration screen and move the GRPFREQ
bar to select blinking frequency as well as the GRPPWM bar to select the duty cycle
(see
Figure 11
).
3. For example, set the GRPPWM to 0x52 (32 % duty cycle) and the GRPFREQ to 0x0B
(0.5 second) for a one-third duty cycle and blink every half second on D3 RGB LED.
4. Change the PWM[1:3] values, GRPPWM and GRPFREQ values to create different
blink patterns and colors.
9. Support
For support, send an E-mail to:
Fig 11. Example of short blink every half second