CSR is very protective of their datasheet's, can you please contact "design@digikey.com" and include your company contact information. Then we can forward your information to the CSR product manager.
I tried to get the datasheet, but there are contracts that has to be signed and CSR lawyers insist that disputes will be in England only. Its too much of a business risk.
I am sure all the other successful manufacturers are successful despite providing datasheets. Cant they at least tell us how to interface with the chip? We dont need to know how the silicon looks like on the inside.