PCA9552D datasheet(11/21 Pages) PHILIPS

Part #	PCA9552D

Description	16-bit I2C LED driver with programmable blink rates

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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Philips Semiconductors

Product data sheet

PCA9552

16-bit I2C LED driver with programmable blink rates

2004 Oct 01

11

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 blink at 4 Hz and at a 25% duty cycle. LED8

to LED15 will be set to off.

Table 1.

I2C-bus

Start

S

PCA9552 address with A0–A2 = low

C0h

PSC0 subaddress + auto-increment

12h

Set prescaler PSC0 to achieve a period of 1 second:

Blink period

+ 1 + PSC0 ) 1

44

PSC0 = 43

2Bh

Set PWM0 duty cycle to 50%:

256 – PWM0

256

+ 0.5

PWM0 = 128

80h

Set prescaler PCS1 to achieve a period of 0.25

seconds:

Blink period

+ 0.25 + PSC1 ) 1

44

PSC1 = 10

0Ah

Set PWM1 output duty cycle to 25%:

256 – PWM1

256

+ 0.25

PWM1 = 192

C0h

Set LED0 to LED3 on

00h

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

FAh

Set LED8 to LED11 off

55h

Set LED12 to LED15 off

55h

Stop

P

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PCA9552D Datasheet(PDF) 11 Page - NXP Semiconductors

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