PCA9553D02 查看數據表（PDF） - Philips Electronics

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PCA9553D02

4-bit I2C LED driver with programmable blink rates

Philips Electronics 

Philips Semiconductors

4-bit I2C LED driver with programmable blink rates

Programming example

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

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

to blink at 4 Hz, 25% duty cycle. PCA9553/01 is used in this

example.

Table 1.

Start

PCA9553 address

PSC0 subaddress + auto-increment

Set prescaler PSC0 to achieve a period of 1 second:

Blink

period

+

1

+

PSC0 )

44

1

PSC0 = 43

Set PWM0 duty cycle to 50%:

256

– PWM0

256

+

0.5

PWM0 = 128

Set prescaler PWM1 to achieve a period of

0.25 seconds:

Blink

period

+

0.25

+

PSC1 )

44

1

PSC1 = 10

Set PWM1 output duty cycle to 25%:

256

– PWM1

256

+

0.25

PWM1 = 192

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

2Bh

80h

0Ah

C0h

E4h

P

Product data sheet

PCA9553

2004 Oct 01

10

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