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Features
■ 80MHz RISC MCU and 80MIPS Kalimba DSP
■ Internal ROM, serial flash memory and EEPROM
interfaces
■ Stereo codec with 2 microphone inputs
■ Radio includes integrated balun
■ 5-band fully configurable EQ
■ CSR's latest CVC technology for narrowband and
wideband voice connections including wind noise
reduction
■ Wideband speech supported by HFP v1.6 profile
and mSBC codec
■ Voice recognition support for answering a call,
enables true hands-free use
■ Multipoint HFP connection to 2 phones for voice
■ Multipoint A2DP connection enables a headset
(A2DP) connection to 2 A2DP source devices for
music playback
■ Secure simple pairing, CSR's proximity pairing
and CSR's proximity connection
■ Audio interfaces: I²S and PCM
■ Serial interfaces: UART, USB 2.0 (full-speed),
I²C and SPI
■ aptX, SBC, MP3 and AAC decoder support
■ Wired audio support (USB and analogue)
■ Support for smartphone/tablet applications
■ Integrated dual switch-mode regulators, linear
regulators and battery charger
■ External crystal load capacitors not required for
typical crystals
■ 3 LED outputs
■ 68‑ball VFBGA 5.5 x 5.5 x 1mm 0.5mm pitch
■ Green (RoHS compliant and no antimony or
halogenated flame retardants)
BlueCore® CSR8645™ BGA
CSR8645 Stereo ROM Solution
with aptX™
2-mic CVC Audio Enhancement
Fully Qualified Single-chip
Bluetooth® v4.0 System
Production Information
CSR8645A04
Issue 6
XTAL
BT_RF
2.4 GHz
Radio
+
Balun
ROM
RAM
Baseband
I /O
MCU
Kalimba
DSP
SPI/ I2C
UART/USB
Serial
Flash /
EEPROM
PIO
Audio In / Out
Debug SPI
General Description
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 including
basic rate, EDR to 3Mbps and Bluetooth low energy.
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.
Applications
■ Stereo headsets
■ Wired stereo headsets and headphones
■ Portable stereo speakers
The enhanced Kalimba DSP coprocessor with
80MIPS supports enhanced audio and DSP
applications.
The integrated audio codec supports 2 channels of
ADC, 2 digital microphone inputs and stereo output, as
well as a variety of audio standards.
See CSR Glossary at www.csrsupport.com.
Production Information
This material is subject to CSR's non-disclosure agreement
© Cambridge Silicon Radio Limited 2011-2012
Page 1 of 114
CS-218182-DSP6
www.csr.com
http://www.Datasheet4U.com
17.1.7 CSR’s Intelligent Power Management ................................................................................. 100
17.1.8 Proximity Pairing .................................................................................................................. 101
17.1.9 Proximity Connection ........................................................................................................... 101
17.2 6th Generation 2-mic CVC Audio Enhancements .............................................................................. 101
17.2.1 Wind Noise Reduction .......................................................................................................... 102
17.2.2 Dual-microphone Signal Separation .................................................................................... 102
17.2.3 Noise Suppression ............................................................................................................... 102
17.2.4 Acoustic Echo Cancellation .................................................................................................. 103
17.2.5 Comfort Noise Generator ..................................................................................................... 103
17.2.6 Equalisation .......................................................................................................................... 103
17.2.7 Automatic Gain Control ........................................................................................................ 103
17.2.8 Packet Loss Concealment ................................................................................................... 103
17.2.9 Adaptive Equalisation ........................................................................................................... 103
17.2.10 Auxiliary Stream Mix ............................................................................................................ 104
17.2.11 Clipper .................................................................................................................................. 104
17.2.12 Noise Dependent Volume Control ........................................................................................ 104
17.2.13 Fixed Gains .......................................................................................................................... 104
17.2.14 Frequency Enhanced Speech Intelligibility .......................................................................... 104
17.3 Music Enhancements ........................................................................................................................ 104
17.3.1 Audio Decoders .................................................................................................................... 104
17.3.2 aptX Decoder ....................................................................................................................... 104
17.3.3 Configurable EQ ................................................................................................................... 105
17.3.4 Stereo Widening (S3D) ........................................................................................................ 105
17.3.5 Volume Boost ....................................................................................................................... 106
17.4 CSR8645 Stereo ROM Solution with aptX Development Kit ............................................................. 106
18 Tape and Reel Information ......................................................................................................................... 107
18.1 Tape Orientation ................................................................................................................................ 107
18.2 Tape Dimensions ............................................................................................................................... 107
18.3 Reel Information ................................................................................................................................ 108
18.4 Moisture Sensitivity Level .................................................................................................................. 108
19 Document References ................................................................................................................................ 109
Terms and Definitions .......................................................................................................................................... 110
List of Figures
Figure 1.1
Figure 2.1
Figure 3.1
Figure 5.1
Figure 6.1
Figure 7.1
Figure 7.2
Figure 8.1
Figure 9.1
Figure 9.2
Figure 9.3
Figure 9.4
Device Pinout .................................................................................................................................. 14
Simplified Circuit BT_RF ................................................................................................................. 23
Clock Architecture ........................................................................................................................... 25
Kalimba DSP Interface to Internal Functions .................................................................................. 28
Serial Flash Interface ...................................................................................................................... 29
Universal Asynchronous Receiver .................................................................................................. 31
Example I²C EEPROM Connection ................................................................................................. 33
LED Equivalent Circuit .................................................................................................................... 35
Audio Interface ................................................................................................................................ 36
Audio Codec Input and Output Stages ............................................................................................ 38
Audio Input Gain ............................................................................................................................. 39
Microphone Biasing ......................................................................................................................... 42
Production Information
This material is subject to CSR's non-disclosure agreement
© Cambridge Silicon Radio Limited 2011-2012
Page 11 of 114
CS-218182-DSP6
www.csr.com