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9551

8-bit I2C LED driver with programmable blink rates

Philips Electronics 

Philips Semiconductors

8-bit I2C LED driver with programmable blink rates

Product data sheet

PCA9551

BLOCK DIAGRAM

PCA9551

SCL

SDA

INPUT

FILTERS

A2 A1 A0

I2C-BUS

CONTROL

INPUT

REGISTER

LED SELECT (LSx)

REGISTER

VDD

RESET

VSS

POWER-ON

RESET

OSCILLATOR

PRESCALER 0

REGISTER

PRESCALER 1

REGISTER

0

1

PWM0

REGISTER

PWM1

REGISTER

BLINK0

BLINK1

NOTE: ONLY ONE I/O SHOWN FOR CLARITY

Figure 3. Block diagram

LEDx

SW01015

2004 Oct 01

4

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