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NXP Semiconductors
PCA9553
4-bit I 2 C-bus LED driver with programmable blink rates
5. Block diagram
PCA9553
INPUT
REGISTER
SCL
SDA
INPUT
FILTERS
I 2 C-BUS
CONTROL
LED SELECT (LSn)
REGISTER
0
V DD
POWER-ON
RESET
PRESCALER 0
REGISTER
PWM0
REGISTER
1
BLINK0
LEDn
OSCILLATOR
PRESCALER 1
REGISTER
PWM1
REGISTER
BLINK1
V SS
002aad745
Only one I/O shown for clarity.
Fig 1.
PCA9553_6
Block diagram
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 29 December 2008
3 of 26
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