Features
BlueCore® CSRA65700 QFN
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CSRA65700 Subwoofer ROM Solution
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General Description
Low Frequency Audio Sink
Fully Qualified Single-chip
Bluetooth® v4.0 System
Advance Information
CSRA65700A05
Issue 1
XTAL
SPI/ I2C
ROM
UART
RAM
BT_RF
2.4GHz
Radio
+
Balun
Baseband
Serial
Flash /
EEPROM
I /O
PIO
MCU
Audio In / Out
Kalimba
DSP
Debug SPI
Applications
BlueCore®
CSR's
CSRA65700 QFN is a cost effective
audio sink device for wireless subwoofer speakers
based on CSR’s Subwoofer Audio Transfer (SWAT)
transport mechanism. CSRA65700 QFN combines with
any CSR SWAT capable source, in the soundbar or
AVR, to form a robust wireless subwoofer link in a high
fidelity multi-channel audio system.
CSRA65700 QFN supports eSCO or L2CAP
uncompressed media channel or wired (independent of
SWAT source) inputs. The subwoofer speaker EQ is
configurable through a single bank three-stage
parametric equalizer filter. The external subwoofer
power amplifier is driven by analogue line out or digital
I2S output, and can be configured via I²C or PIOs.
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Wireless subwoofer speakers
CSR's configuration tools and Persistent Store Keys
(external EEPROM or SPI flash) provide a flexible
means of customising CSRA65700 QFN to drive the
subwoofer power amplifiers I²C interface, assign PIO
functionality, associate device control with different
button presses, configure user and speaker EQ
settings, configure volume control and define unique
LED patterns with user actions, system states and
system events.
See CSR Glossary at www.csrsupport.com.
Advance Information
Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement
© Cambridge Silicon Radio Limited 2013
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CSRA65700 QFN Technical Overview
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Bluetooth® v4.0 specification
80 MHz RISC MCU and 80 MIPS Kalimba DSP
Internal ROM, serial flash memory and EEPROM
interfaces
Radio includes integrated balun with RF
performance of 8dBm transmit power and -89dBm
receiver sensitivity
CSR's Subwoofer Audio Transfer (SWAT) transport
mechanism
eSCO or L2CAP uncompressed audio channels
Mono wired input
Secure simple pairing with CSR's proximity pairing
3 ms latency (Source relative to Subwoofer)
Configurable speaker cut-off frequency
250 Hz maximum subwoofer cut-off frequency
Serial interfaces: I²C and SPI
DSP packet loss concealment algorithms
Configurable EQ settings
Configurable I2S audio output
Configurable I²C and PIOs output for audio power
amplifier control
3 hardware LED controllers
68-lead QFN 8 x 8 x 0.9mm 0.4mm pitch
Device Details
Physical Interfaces
SPI interface for debug and programming
I²C EEPROM interface for external power amplifier
UART (for Production Test environment only)
Up to 20 general purpose PIOs with 3 extra opendrain PIOs available when LED not used
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PCM I²S output
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3 LED drivers (includes RGB) with PWM flasher
independent of MCU
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,
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
Audio Interfaces
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ADC mono line input
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48 kHz ADC sample rate
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Mono audio DAC
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Supported DAC sample rates of 44.1 and 48 kHz
Auxiliary Features
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Crystal oscillator with built-in digital trimming
Package Option
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68-lead QFN 8 x 8 x 0.9mm 0.4mm pitch
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Advance Information
Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement
© Cambridge Silicon Radio Limited 2013
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CSRA65700 QFN Technical Overview
Bluetooth Radio
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On-chip balun (50Ω impedance)
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No production trimming of external components
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Bluetooth v4.0 specification compliant
Bluetooth Transmitter
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8dBm (typ) RF transmit power with level control
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Class 1, Class 2 and Class 3 support, no external
PA or TX/RX switch required
Bluetooth Receiver
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-91dBm (typ) π/4 DQPSK receiver sensitivity and
-81dBm (typ) 8DPSK receiver sensitivity
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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
CSRA65700 Subwoofer ROM Solution Details
Audio Features
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Subwoofer EQ manageable via two configurations:
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Subwoofer speaker EQ configurable via single
bank three-stage parametric filter (wired and
wireless channels)
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User programmable EQ (wired input only)
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Direct subwoofer volume control (wired input only)
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Subwoofer volume controlled by source device when
using wireless channel
Additional Functionality
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CSR's proximity pairing and CSR's proximity
connection
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Dedicated subwoofer pairing mode
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Deletable subwoofer pairing history
L2CAP for A2DP media channel input
High quality eSCO link media channel input
I2S output connection for digital power amplifier
ADC media channel input solution for non-wireless
systems
Analogue output connection for analogue power
amplifier
Advance Information
Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement
© Cambridge Silicon Radio Limited 2013
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CSRA65700 QFN Technical Overview
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Bluetooth Profiles
Bluetooth v4.0 specification support
Configuration Tools
Configures the CSRA65700 subwoofer ROM solution
software features:
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UFE Tools
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PS Tools
Packet loss concealment algorithm:
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For eSCO and wireless A2DP (L2CAP) inputs
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DSP concealment techniques replace bit or packet
errors (and late packets)
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Automatic fade control mutes or ramps audio when
excessive link loss or data recovery occurs
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System Overview
Application
Audio Sink
SWAT
L2CAP
Baseband
G-TW-0013252.1.2
LMP
SDP
SWAT Audio Source
CSRA65700
CSR’s SWAT is a protocol and control mechanism for
streaming mono audio, stripped of its high frequencies,
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This profile stack figure shows the SWAT protocol
from the source device over a Bluetooth link to the sink
and the core Bluetooth protocols
device. SWAT provide the means for source and sink
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SWAT defines the protocols and procedures that
devices to discover each other’s capabilities, setup a
realise distribution of audio content of low frequency,
standard (L2CAP) or low latency (eSCO) media channel,
SWAT audio channels on ACL (L2CAP) or eSCO
and stream high quality low frequency audio that is robust
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SWAT consists of a control entity for command
to errors and losses in the link.
transfer and a transport entity that handles streaming
This system overview shows a subwoofer utilising CSRA65700 QFN, combining with a soundbar that contains a CSR
SWAT capable source device.
Soundbar
Subwoofer
SWAT SOURCE
CSRA65700
Swift
Application
UART
SPDIF
Swift Host
Amplifier
Amplifier
Display
Infrared
MAPX
Microphone
Buttons
I 2S
SPDIF HDMI
Advance Information
Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement
© Cambridge Silicon Radio Limited 2013
G-TW-0 01321 1.1 .5
Main
Speakers
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CSRA65700 QFN Technical Overview
CSRA65700 QFN
SWAT
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CSRA65700 QFN is a cost effective Bluetooth audio
sink for wireless subwoofers based on CSR’s
Application
Subwoofer Audio Transfer (SWAT)
Audio
Source
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CSRA65700 QFN works with CSR SWAT source
capable devices in Soundbars, AVRs or HTiBs to
form a robust wireless subwoofer link in a high fidelity
SWAT
SDP
multi-channel audio system.
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CSRA65700 QFN supports eSCO or L2CAP
uncompressed media channels
LMP
L2CAP
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Also compatible with CSR Swift™ enabled
soundbars, HTiBs and AVRs, CSRA65700 QFN
provides a digital or analogue audio signal to the
Baseband
subwoofer power amplifier
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Ordering Information
Package
Device
CSRA65700
Subwoofer ROM
Solution
Type
Size
Shipment
Method
QFN‑68-lead
(Pb free)
8 x 8 x 0.9mm
0.4mm pitch
Tape and reel
Order Number
CSRA65700A05‑IQQF‑R
Note:
Until CSRA65700A05 reaches Production status, engineering samples order number applies. This is
ES‑CSRA65700A05‑IQQF, 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.
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]
CSRA65700 Subwoofer ROM Solution Development Kit Ordering
Information
Description
Order Number
CSRA65700 Subwoofer ROM Solution Audio Development Kit
DK‑65700‑xxxxx‑1A
Document History
Revision
Date
Change Reason
Issue 1
15 NOV 13
Original publication of this document.
Advance Information
Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement
© Cambridge Silicon Radio Limited 2013
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CSRA65700 QFN Technical Overview
CSRA65700 QFN is a ROM-based device where the product code has the form CSRA65700Axx. Axx is the specific
ROM-variant, A05 is the ROM-variant for CSRA65700 Subwoofer ROM Solution.
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.
CSRA65700 QFN Technical Overview
Advance Information
Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement
© Cambridge Silicon Radio Limited 2013
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