PCA9550 데이터 시트보기 (PDF) - Philips Electronics

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PCA9550

2-bit I2C LED driver with programmable blink rates

Philips Electronics 

Philips Semiconductors

2-bit I2C LED driver with programmable blink rates

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 blink at 4 Hz, 25% duty cycle.

Table 1.

Start

PCA9550 address with A0 = LOW

PSC0 subaddress + auto-increment

Set prescaler PSC0 to achieve a period of 1 second:

Blink period

+

1

+

PSC0 )

38

1

PSC0 = 37

Set PWM0 duty cycle to 50%:

256

– PWM0

256

+

0.5

PWM0 = 128

Set prescaler PCS1 to achieve a period of 0.25

seconds:

Blink period

+

0.25

+

PSC1 )

38

1

PSC1 = 9

Set PWM1 output duty cycle to 25%:

256

– PWM1

256

+

0.25

PWM1 = 192

Set LED0 to PWM0 and set LED1 to blink at PWM1

Stop

I2C-bus

S

COh

11h

25h

80h

09h

C0h

OEh

P

Product data

PCA9550

2003 May 02

9

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