9531 datasheet(10/20 Pages) PHILIPS

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Philips Semiconductors

Product data

PCA9531

8-bit I2C LED dimmer

2003 Nov 10

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 be dimmed at 25% of their maximum

brightness (duty cycle = 25%).

Table 1.

I2C-bus

Start

PCA9531 address with A0-A2 = low

C0h

PSC0 subaddress + auto-increment

11h

Set prescaler PSC0 to achieve a period of 1 second:

Blink period

+ 1 + PSC0 ) 1

152

PSC0 = 151

97h

Set PWM0 duty cycle to 50%:

PWM0

256

+ 0.5

PWM0 = 128

80h

Set prescaler PCS1 to dim at max frequency:

Blink period

+ max

PSC1 = 0

00h

Set PWM1 output duty cycle to 25%:

PWM1

256

+ 0.25

PWM1 = 64

40h

Set LED0 to LED3 on

55h

Set LED4 and 5 to PWM0, and LED6 or 7 to PWM1

FAh

Stop

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