INTEGRATED CIRCUITS PCA9553 4-bit I2C LED driver with programmable blink rates Product data sheet Supersedes data of 2003 May 02 2004 Oct 01 Philips Semiconductors Philips Semiconductors Product data sheet 4-bit I2C LED driver with programmable blink rates PCA9553 or PCA9554, the bus master must send repeated commands to turn the LED on and off.
This greatly increases the amount of traffic on the I2C-bus and uses up one of the master’s timers.
The PCA9553 LED Blinker instead requires only the initial set-up command to program BLINK RATE 1 and BLINK RATE 2 (i.
e.
, the frequency and duty cycle).
From then on, only one command from the bus master is required to turn each individual open d...

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