I2C (IIC)
The I2C (IIC) interface is a synchronous serial communication protocol bus that can communicate between multiple controllers, such as an MCU (primary), and single or multiple lower-speed target peripheral devices (secondary). It uses two wires, SCL (serial clock line) and SDA (bidirectional serial data line), to communicate.
Each secondary device has a unique address. The I2C bus can support up to 128 devices. Data on the I2C-bus can be transferred at a rate of 100 kbit/s in the standard-mode and up to 400 kbit/s in the fast-mode.
SPI
The SPI (serial peripheral interface), with its four-wire chip select (CS), Serial Input Data (SI), Serial Output Data (SO), and Clock (CLK), offers a versatile communication solution primarily in embedded systems. It leverages the chip select line to enable communication with the specific device you intend to interact with.
Data on the SPI-bus can be transferred at a rate of 20MHz (typical) and up to 50MHz.
AL3644: Dual 1.5A Current Source Camera Flash LED Driver (I2C-compatible interface)
AL5887: I2C/SPI 36-Channel RGB Linear LED Driver
