# Bluetooth Low Energy Baseband Controller

RSL15 has dedicated hardware designed to handled Bluetooth Low Energy activities and events. From one side, the hardware communicates with the RF front-end control interface through an internal SPI interface (for RX or TX programming and radio FSM control purposes), along with internal signals connected between Bluetooth Low Energy hardware and the RF front-end for the TX/RX data/clock and IQ data. From the other side, the hardware communicates to the Bluetooth Low Energy stack software. This communication is executed in firmware through shared memory, Bluetooth Low Energy interrupts, and Bluetooth Low Energy hardware registers.

Each onsemi Bluetooth Low Energy device has a globally unique EUI-48 address (formerly called a MAC-48 address), assigned in accordance with IEEE standards. These addresses can be used as the Bluetooth device address, guaranteeing that the address is distinct and ensuring reliable identification and communication across all Bluetooth Low Energy-enabled systems.

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