PCA9533DP Ver la hoja de datos (PDF) - Philips Electronics

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Fabricante

PCA9533DP

4-bit I2C LED dimmer

Philips Electronics 

Philips Semiconductors

4-bit I2C LED dimmer

Programming example

The following example will show how to set LED0 and LED1 off. It

will set LED2 to blink at 1 Hz, 50 % duty cycle. LED3 will be set to

be dimmed at 25 % of their maximum brightness

(duty cycle = 25 %). PCA9533/01 is used in this example.

Table 1.

Start

PCA9533 address

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 PWM1 to dim at maximum frequency

Blink period + maximum

PSC1 = 0

Set PWM1 output duty cycle to 25 %:

PWM1

256

+

0.25

PWM1 = 64

Set LED0 on, LED1 off, LED2 set to blink at PSC0,

PWM0, LED3 set to blink at PCS1, PWM1

Stop

I2C-bus

S

C4h

11h

97h

80h

00h

40h

E1h

P

Product data sheet

PCA9533

2004 Oct 01

10

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