PCA9530D 데이터 시트보기 (PDF) - Philips Electronics

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PCA9530D

2-bit I2C LED dimmer

Philips Electronics 

Philips Semiconductors

2-bit I2C LED dimmer

Programming example

The following example will show how to set LED0 to blink at 1 Hz at

a 50% duty cycle. LED1 will be set to be dimmed at 25% of their

maximum brightness (duty cycle = 25%).

Table 1.

Start

PCA9530 address with A0 = 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 maximum frequency.

Blink period + maximum

PSC1 = 0

Set PWM1 output duty cycle to 25%:

PWM1

256

+

0.25

PWM1 = 64

Set LED0 to PWM0 and set LED1 to blink at PWM1

Stop

I2C-bus

S

COh

11h

97h

80h

00h

40h

OEh

P

Preliminary data

PCA9530

2002 Dec 12

9

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