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Philips Semiconductors
PCA9552
16-bit I 2 C-bus LED driver with programmable blink rates
V DD
3.3 V
5V
V DD
LED
100 k ?
V DD
LED
LEDn
002aac189
Fig 15. High value resistor in parallel with
LEDn
002aac190
Fig 16. Device supplied by a lower voltage
the LED
8.2 Programming example
The following example will show how to set LED0 to LED3 on. It will then set LED4 and
LED5 to blink at 1 Hz at a 50 % duty cycle. LED6 and LED7 will be set to blink at 4 Hz and
at a 25 % duty cycle. LED8 to LED15 will be set to off.
Table 11:
Programming PCA9552
PCA9552_5
Program sequence
START
PCA9552 address with A0 to A2 = LOW
PSC0 subaddress + Auto-Increment
Set prescaler PSC0 to achieve a period of 1 second:
PSC0 + 1
Blink period = 1 = -----------------------
44
PSC0 = 43
Set PWM0 duty cycle to 50 %:
256 – PWM0
-------------------------------- = 0.5
256
PWM0 = 128
Set prescaler PCS1 to achieve a period of 0.25 seconds:
PSC1 + 1
Blink period = 0.25 = -----------------------
44
PSC1 = 10
Set PWM1 output duty cycle to 25 %:
256 – PWM1
-------------------------------- = 0.25
256
PWM1 = 192
Set LED0 to LED3 on
Set LED4 and LED5 to PWM0, and LED6 or LED7 to PWM1
Set LED8 to LED11 off
Set LED12 to LED15 off
STOP
I 2 C-bus
S
C0h
12h
2Bh
80h
0Ah
C0h
00h
FAh
55h
55h
P
? Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 05 — 9 March 2006
14 of 28
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