The PCF87852 combines the BluetoothTM protocol stack, Link Controller (LC), Link Manager (LM), and Host Controller Interface (HCI) firmware of the Bluetooth system specification in a single IC with embedded software. Together with an RF module, a few external components and an antenna it forms a Bluetooth system. In most cases this module will be attached to a host, for example a GSM baseband controller or a PC processor. The PCF87852 may also be used for embedded Bluetooth applications by running the upper software layers also from the on-chip memory. Together with an external voice codec a Bluetooth headset application can be realized.