pca9552bs NXP Semiconductors, pca9552bs Datasheet - Page 14

• Manufacturer Part Number: pca9552bs
• Description: 16-bit I2c Led Driver With Programmable Blink Rates
• Manufacturer: NXP Semiconductors

Philips Semiconductors
PCA9552_5
Product data sheet
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:
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 = 43
Set PWM0 duty cycle to 50 %:
PWM0 = 128
Set prescaler PCS1 to achieve a period of 0.25 seconds:
PSC1 = 10
Set PWM1 output duty cycle to 25 %:
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
Fig 15. High value resistor in parallel with
Blink period
256 PWM0
------------------------------- -
Blink period
256 PWM1
------------------------------- -
–
–
256
256
the LED
V
Programming PCA9552
DD
LEDn
=
=
=
=
1
0.25
0.5
0.25
=
PSC0
---------------------- -
=
PSC1
---------------------- -
44
Rev. 05 — 9 March 2006
LED
+
44
1
+
16-bit I
1
002aac189
100 k
V
DD
2
C-bus LED driver with programmable blink rates
Fig 16. Device supplied by a lower voltage
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
3.3 V
V
DD
LEDn
PCA9552
5 V
002aac190
LED
I
S
C0h
12h
2Bh
80h
0Ah
C0h
00h
FAh
55h
55h
P
2
C-bus
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