PCA9533 dimmer equivalent, 4-bit i2c led dimmer.
* 4 LED drivers (on, off, flashing at a programmable rate)
* 2 selectable, fully programmable blink rates (frequency and duty
cycle) between 0.591 Hz and 152 Hz .
The PCA9533 contains an internal oscillator with two user programmable blink rates and duty cycles coupled to the outpu.
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