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CHEERSTAR headphones and speakers are all CSR Bluetooth chips. CSR plc (formerly Cambridge Silicon Radio) was a multinational fabless semiconductor company headquartered in Cambridge, United Kingdom. Its main products were connectivity, audio, imaging and location chips. CSR was listed on the London Stock Exchange and was a constituent of the FTSE 250 Index until it was acquired by Qualcomm in August 2015. Under Qualcomm’s ownership, the company was renamed Qualcomm Technologies International, Ltd. More details to

We Are Currently Using Two Bluetooth Chips: CSR8635 & CSR8645
CSR’s BlueCore® CSR8635 QFN is a single-chip Bluetooth ROM audio solution for rapid evaluation and development of Bluetooth ROM stereo applications.
BlueCore® CSR8635 QFN consumer audio platform for wired and wireless applications using the QFN package integrates an ultra-low power DSP and application processor with embedded flash memory, a highperformance stereo codec, a power management subsystem and LED drivers.
The CSR configuration tools and the development kit provide a flexible and powerful development platform to design advanced and high-quality Bluetooth stereo products using BlueCore® CSR8635 QFN single-chip Bluetooth audio solution.

BlueCore® CSR8645™ BGA is a product from CSR’s Connectivity Centre. It is a single-chip radio and baseband IC for Bluetooth 2.4GHz systems.
The integrated peripherals reduce the number of external components required, including no requirement for external codec, battery charger, SMPS, LDOs, balun or external program memory, ensuring minimum production costs.The battery charger architecture enables the CSR8645 BGA to independently operate from the charger supply, ensuring dependable operation for all battery conditions.

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