PCA9531PW Ver la hoja de datos (PDF) - Philips Electronics

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Fabricante

PCA9531PW

8-bit I2C LED dimmer

Philips Electronics 

Philips Semiconductors

8-bit I2C LED dimmer

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.

Start

PCA9531 address with A0-A2 = low

PSC0 subaddress + auto-increment

Set prescaler PSC0 to achieve a period of 1 second:

Blink period

+

1

+

PSC0 )

152

1

PSC0 = 151

Set PWM0 duty cycle to 50%:

PWM0

256

+

0.5

PWM0 = 128

Set prescaler PCS1 to dim at max frequency:

Blink period + max

PSC1 = 0

Set PWM1 output duty cycle to 25%:

PWM1

256

+

0.25

PWM1 = 64

Set LED0 to LED3 on

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

Stop

I2C-bus

S

C0h

11h

97h

80h

00h

40h

55h

FAh

P

Product data

PCA9531

2003 Nov 10

10

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