AW9523B 16-Channel LED Driver & I2C GPIO Expander (C148077, QFN-24)

Expand your microcontroller's capabilities and create stunning lighting effects with the AW9523B multi-function IC. This highly versatile chip operates as both a 16-channel constant-current LED driver and a general-purpose input/output (GPIO) expander. By utilizing the standard I2C bus interface, it allows you to control up to 16 independent LEDs or read/write to 16 digital pins while occupying only two precious pins on your main MCU (like an STM32, ESP32, or Arduino).

When configured in LED mode, each of the 16 channels features an independent 256-step linear dimming control, allowing for ultra-smooth breathing effects, color mixing, and custom drone navigation light patterns. If used as an I/O expander, it is perfect for reading multiple switches or driving relays. Housed in a compact QFN-24 package, the AW9523B is an excellent choice for custom FPV drone lighting boards, custom mechanical keyboards, and complex DIY electronics where space and MCU pins are at a premium.

Key Features:

• Dual Functionality: Each of the 16 channels can be independently configured as an LED drive pin or a standard GPIO pin.

• I2C Interface: Controls 16 channels using only two wires (SDA/SCL), drastically saving I/O pins on your primary microcontroller.

• 256-Step Dimming: Features built-in 8-bit linear dimming control for each LED channel, allowing for smooth, flicker-free brightness adjustments.

• Interrupt Support: Includes an interrupt output (INT) to notify the master MCU of input state changes without constant polling.

Specifications:

• Part Number: AW9523B (LCSC: C148077)

• IC Type: LED Driver / I/O Expander

• Interface: I2C (Up to 400 kHz)

• Number of Channels: 16

• Dimming Control: 256 steps (8-bit) per channel

• Package Type: QFN-24 (SMD/SMT)