BlueCore® CSR8645™ BGA
Features
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2-mic CVC Audio Enhancement
Fully Qualified Single-chip
Bluetooth® v4.0 System
Pre-production Information
CSR8645A03
Issue 2
XTAL
BT _RF
2.4GHz
Radio
+
Balun
ROM
External Memory
RAM
UART/USB
Baseband
I/O
Serial Flash /
EEPROM
PIO
MCU
Audio In/Out
Kalimba
DSP
SPI/I2C
General Description
Applications
BlueCore®
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.
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.
Production Information
© Cambridge Silicon Radio Limited 2011
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Page 1 of 5
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CSR8645 BGA Technical Overview
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CSR8645 Stereo ROM Solution
with aptX™
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 v2.0 (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)
Device Details
Production Information
© Cambridge Silicon Radio Limited 2011
Physical Interfaces
UART interface for debug
USB 2.0 (full-speed) interface for audio and charger
enumeration
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1-bit SPI flash memory interface
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SPI interface for debug and programming
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I²C interface for EEPROM
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Up to 22 general purpose PIOs with 3 extra opendrain PIOs available when LED not used
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PCM and I²S interfaces
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3 LED drivers (includes RGB) with PWM flasher
independent of MCU
Integrated Power Control and Regulation
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Automatic power switching to charger when present
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2 high-efficiency switch-mode regulators with 1.8V
and 1.35V outputs direct from battery supply
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3.3V linear regulator for USB supply
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Low-voltage linear regulator for internal digital
circuits
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Low-voltage linear regulator for internal analogue
circuits
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Power-on-reset detects low supply voltage
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Power management includes digital shutdown and
wake-up commands for ultra-low power modes
Battery Charger
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Lithium ion / Lithium polymer battery charger
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Instant-on function automatically selects the power
supply between battery and USB, which enables
operation even if the battery is fully discharged
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Fast charging support up to 200mA with no external
components
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Higher charge currents using external pass device
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Supports USB charger detection
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Support for thermistor protection of battery pack
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Support to enable end product design to PSE law:
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Design to JIS-C 8712/8714 (batteries)
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Testing based on IEEE 1725
Baseband and Software
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Internal ROM
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Memory protection unit supporting accelerated VM
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56KB internal RAM, enables full-speed data
transfer, mixed voice/data and full piconet support
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Logic for forward error correction, header error
control, access code correlation, CRC,
demodulation, encryption bit stream generation,
whitening and transmit pulse shaping
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Transcoders for A-law, µ-law and linear voice from
host and A-law, µ-law and CVSD voice over air
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CSR8645 BGA Technical Overview
Bluetooth Radio
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On-chip balun (50Ω impedance in TX and RX
modes)
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No trimming of external components required in
production
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Bluetooth v4.0 specification compliant
Bluetooth Transmitter
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9dBm RF transmit power with level control from onchip 6-bit DAC
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Class 1, Class 2 and Class 3 support without the
need for an external power amplifier or TX/RX
switch
Bluetooth Receiver
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Receiver sensitivity of -90dBm
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Integrated channel filters
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Digital demodulator for improved sensitivity and cochannel rejection
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Real-time digitised RSSI available to application
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Fast AGC for enhanced dynamic range
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Channel classification for AFH
Bluetooth Synthesiser
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Fully integrated synthesiser requires no external
VCO, varactor diode, resonator or loop filter
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Compatible with crystals 16MHz to 32MHz
Kalimba DSP
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Enhanced Kalimba DSP coprocessor, 80MIPS,
24‑bit fixed point core
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2 single-cycle MACs; 24 x 24-bit multiply and 56-bit
accumulator
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32-bit instruction word, dual 24-bit data memory
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6K x 32-bit program RAM including 1K instruction
cache for executing out of internal ROM
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16K x 24-bit + 16K x 24-bit 2-bank data RAM
Audio Interfaces
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Audio codec with 2 high-quality dedicated ADCs
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Microphone bias generator and up to 2 analogue
microphone inputs
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2 digital microphone inputs (MEMS)
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Enhanced side-tone gain control
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Supported sample rates of 8, 11.025, 16, 22.05, 32,
44.1, 48 and 96kHz (DAC only)
Auxiliary Features
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Crystal oscillator with built-in digital trimming
Package Option
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68‑ball VFBGA 5.5 x 5.5 x 1mm 0.5mm pitch
CSR8645 Stereo ROM Solution with aptX Details
Production Information
© Cambridge Silicon Radio Limited 2011
Headset Configurator Tool
Configures the CSR8645 stereo ROM solution with aptX
software features:
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Bluetooth v4.0 specification features
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Reconnection policies, e.g. reconnect on power-on
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Audio features, including default volumes
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Button events: configuring button presses and
durations for certain events, e.g. double press on
PIO for last number redial
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LED indications for states, e.g. headset connected,
and events, power on etc.
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Indication tones for events and ringtones
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HFP v1.6 supported features
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Battery divider ratios and thresholds, e.g.
thresholds for battery low indication, full battery etc.
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Advanced Multipoint settings
CSR8645 Stereo ROM Solution with aptX Development
Kit
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CSR8645 stereo ROM solution with aptX
demonstrator board
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Music and voice dongle
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Interface adapters and cables are available
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Works in conjunction with the CSR8645 stereo
ROM solution with aptX Configurator tool and other
supporting utilities
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For order code details contact CSR
Page 3 of 5
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CSR8645 BGA Technical Overview
Bluetooth Profiles
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Bluetooth v4.0 specification support
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HFP v1.6 wideband speech (HD voice ready)
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HSP v1.2
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A2DP v1.2
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AVRCP v1.4
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Support for smartphone applications (apps)
Improved Audio Quality
CSR’s latest 2-mic CVC audio enhancements for
narrowband and wideband connections including:
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2-mic far-end audio enhancements
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Near-end audio enhancements (noise suppression
and AEQ)
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Wind noise reduction
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Packet loss concealment
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Bit error concealment
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Automatic gain control and automatic volume
control
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Frequency expansion for improved speech
intelligibility
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mSBC codec support for wideband speech
Music Enhancements
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Configurable 5-band EQ for music playback (rock,
pop, classical, jazz, dance etc)
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aptX, SBC, MP3, AAC and Faststream decoder
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Stereo widening (S3D)
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Volume Boost
Additional Functionality
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Support for voice recognition
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Support for multi-language programmable audio
prompts
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CSR's proximity pairing and CSR's proximity
connection
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Multipoint support for HFP connection to 2 handsets
for voice
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Multipoint support for A2DP connection to 2 A2DP
sources for music playback
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Talk-time extension
1
Ordering Information
Package
Device
CSR8645 Stereo ROM
Solution with aptX
Type
Size
Shipment
Method
VFBGA 68‑ball
(Pb free)
5.5 x 5.5 x 1mm
0.5mm pitch
Tape and reel
Order Number
CSR8645A03‑IBBC‑R
Note:
Until CSR8645A03 reaches Production status, engineering samples order number applies. This is
ES‑CSR8645A03‑IBBC, with no minimum order quantity.
At Production status minimum order quantity is 2kpcs taped and reeled.
Your attention is drawn to Cambridge Silicon Radio Limited’s ("Seller"’s ) standard terms of supply which govern
the supply of Prototype Products or Engineering Samples and which state in clause 5:
5.1 "Prototype Products" or "Engineering Samples" means any products that have not passed all the stages of
full production acceptance as determined solely by the Seller. The Seller will usually identify which of the Goods
ordered are considered Prototype Products designating them "ES" on the Quotation and any Order for Prototype
Products shall be subject to the special terms contained in this clause 5.
5.2 The Seller has used reasonable efforts to design and build the Prototype Products in accordance with the
relevant specification, but because the testing carried out by the Seller in respect of the Prototype Products is
incomplete, the Seller does not give or enter into any warranties, conditions or other terms in relation to quality
or fitness for purpose of the Prototype Products and/or that the Prototype Products are free from bugs, errors
or omissions.
Supply chain: CSR's manufacturing policy is to multisource volume products. For further details, contact your
local sales account manager or representative.
To contact a CSR representative, email [email protected] or go to www.csr.com/contacts.
Production Information
© Cambridge Silicon Radio Limited 2011
Page 4 of 5
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CSR8645 BGA Technical Overview
CSR8645 BGA is a ROM-based device where the product code has the form CSR8645Axx. Axx is the specific
ROM-variant, A03 is the ROM-variant for CSR8645 Stereo ROM Solution with aptX.
1.1
Contacts
General information
Information on this product
Customer support for this product
Details of compliance and standards
Help with this document
1.2
www.csr.com
[email protected]
www.csrsupport.com
[email protected]
[email protected]
CSR8645 Stereo ROM Solution with aptX Development Kit Ordering
Information
Description
Order Number
CSR8645 Stereo ROM Solution with aptX Audio Development Kit
DK-8645-10064-1A
Revision
Date
Change Reason
1
24 OCT 11
Original publication of this document.
2
16 DEC 11
Bluetooth v4.0 specification added.
If you have any comments about this document, email [email protected] giving number, title and section
with your feedback.
Trademarks, Patents and Licences
Unless otherwise stated, words and logos marked with ™ or ® are trademarks registered or owned by CSR plc or its affiliates. Bluetooth ® and the
Bluetooth ® logos are trademarks owned by Bluetooth ® SIG, Inc. and licensed to CSR. Other products, services and names used in this document
may have been trademarked by their respective owners.
The publication of this information does not imply that any license is granted under any patent or other rights owned by CSR plc and/or its affiliates.
CSR reserves the right to make technical changes to its products as part of its development programme.
While every care has been taken to ensure the accuracy of the contents of this document, CSR cannot accept responsibility for any errors.
Refer to www.csrsupport.com for compliance and conformance to standards information.
Production Information
© Cambridge Silicon Radio Limited 2011
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CSR8645 BGA Technical Overview
Document History