It has 16 I/O pins, that'll double most boards' pin count
Four I2C address options, so you can connect 4 expanders to one bus
Each pin can be an input or an output
IRQ output can alert you when input pins change value
This chip does not support internal pull-ups or pull-downs, you will need to add an external resistor if you need one
However, it does have 8-bit linear constant-current LED dimming support so you can connect LEDs without resistors and have great looking dimming without PWM
The first 8 pins can be configured as open drain (as a group)
AW9523 Features:
16 multi-function I/O, each for LED drive (current-source dimming) or GPIO mode
256 steps linear dimming in LED drive mode
Any GPIO can be configured as an input or an output independently
Support interrupt, 8us deglitch, low-level active
Standard I2C interface, AD1/AD0 select I2C device address
SDA, SCL, SHDN, and all GPIO can accept in 1.8V logic input
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