NXP Semiconductors PCA9955A, Руководство пользователя, Страница: 15 / 25

UM10729 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors B.V. 2017. All rights reserved.
User manual Rev. 2 — 1 August 2017 15 of 24
NXP Semiconductors
UM10729
PCA9955A/B demonstration board OM13483
02,Write,Yes,0,81,21,FF,FF,FF,FF,Comments: start write 01h register to program the
DMBLNK=1 for blinking, LDRx=11 for group dimming/blinking controlled by
GRPPWM, GRPFREQ
02,Write,Yes,0,44,C0,Comments: write PWMALL register to set the PWMx=C0h 75% duty
cycles for individual LED
02,Write,Yes,2000,86,40,00,Comments: write GRPPWM=40h for duty cycle (ON/OFF ratio
in 25%) and GRPFREQ= 00h (67 ms for blinking period)
02,Write,Yes,2000,86,80,01,Comments: write GRPPWM=80h for duty cycle (ON/OFF ratio
in 50%) and GRPFREQ= 02h (131 ms for blinking period)
02,Write,Yes,2000,86,A0,02,Comments: write GRPPWM=C0h for duty cycle (ON/OFF ratio
in 62.5%) and GRPFREQ= 04h (196 ms for blinking period)
02,Write,Yes,2000,86,C0,03,Comments: write GRPPWM=FFh for duty cycle (ON/OFF ratio
in 75%) and GRPFREQ= 06h (262 ms for blinking period)
00,Write,Yes,0,06,Comments: SW reset
Sequence:01,02,03,04,05,06,07,08,09,10,11,12,13,14,15,16,17,18,19,20,21,22,23
3. After opening the ‘PCA9955A/B WHT_RGB LEDs blinking demo i2c address = 0x02h’
text file, the Win-I2CUSB GUI in Expert mode screen will be displayed as shown in
Figure 8 .
4. Click the ‘Send All’ button. All the valid messages on the screen is sent in order of the
row number (Msg #). The action is performed one time.
Fig 8. Message data in Expert mode to demonstrate all White and RGB LEDs for
blinking