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Features
■ Bluetooth® v4.0 specification compliant
■ 80MHz RISC MCU and 80MIPS Kalimba DSP
■ Stereo codec with 1 microphone input
■ Internal ROM, serial flash memory and EEPROM
interfaces
■ High-performance Stereo codec
■ Radio includes integrated balun with RF
performance of 8dBm transmit power and -89dBm
receiver sensitivity
■ AVRCP v1.4
■ 5-band fully configurable EQ
■ Wideband speech supported by HFP v1.6 and
mSBC codec
■ CSR's latest CVC technology for narrowband and
wideband voice connections including wind noise
reduction
■ Multipoint support for A2DP connection to 2
A2DP sources for music playback
■ Secure simple pairing, CSR's proximity pairing and
CSR's proximity connections
■ Stereo line-in
■ Serial interfaces: USB 2.0, UART, I²C and SPI
■ SBC, MP3 and AAC decoder support
■ Wired audio support
■ Integrated dual switch-mode regulators, linear
regulators and battery charger
■ External crystal load capacitors not required for
typical crystals
■ 3 LED outputs (RGB)
■ 68-lead QFN 8 x 8 x 0.9mm 0.4mm pitch
■ Green (RoHS compliant and no antimony or
halogenated flame retardants)
General Description
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 high-
performance 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® CSR8635 QFN
CSR8635 Stereo ROM Solution
1-mic CVC Audio Enhancement
Fully Qualified Single-chip
Bluetooth® v4.0 System
Production Information
CSR8635A04
Issue 5
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
Applications
■ Stereo speakers
■ Speakerphones
■ 1-mic stereo headset or headphones
■ Handsfree car kits
The enhanced Kalimba DSP coprocessor with 80MIPS
supports enhanced audio and DSP applications.
The integrated audio codec supports stereo input and
output, as well as a variety of audio standards.
See CSR Glossary at www.csrsupport.com.
Production Information
© Cambridge Silicon Radio Limited 2013
Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement
Page 1 of 105
CS-303725-DSP5
www.csr.com
16.2.13 Input Output Gains ..................................................................................................................... 94
16.3 Music Enhancements ............................................................................................................................... 95
16.3.1 Audio Decoders .......................................................................................................................... 95
16.3.2 Configurable EQ ......................................................................................................................... 95
16.3.3 Stereo Widening (S3D) ............................................................................................................... 95
16.3.4 Volume Boost ............................................................................................................................. 96
16.4 CSR8635 Stereo ROM Solution Development Kit ................................................................................... 96
17 Tape and Reel Information ................................................................................................................................ 97
17.1 Tape Orientation ...................................................................................................................................... 97
17.2 Tape Dimensions ..................................................................................................................................... 98
17.3 Reel Information ....................................................................................................................................... 99
17.4 Moisture Sensitivity Level ......................................................................................................................... 99
18 Document References ..................................................................................................................................... 100
Terms and Definitions .............................................................................................................................................. 101
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
Figure 9.5
Figure 9.6
Figure 9.7
Figure 9.8
Figure 9.9
Figure 9.10
Figure 9.11
Figure 9.12
Figure 9.13
Figure 9.14
Figure 9.15
Figure 9.16
Figure 9.17
Figure 9.18
Figure 9.19
Figure 9.20
Figure 9.21
Figure 9.22
Figure 10.1
Figure 10.2
Figure 10.3
Figure 10.4
Figure 10.5
Device Pinout ....................................................................................................................................... 13
Simplified Circuit BT_RF ...................................................................................................................... 22
Crystal Oscillator Overview .................................................................................................................. 24
Kalimba DSP Interface to Internal Functions ....................................................................................... 29
Serial Flash Interface ........................................................................................................................... 30
Universal Asynchronous Receiver ....................................................................................................... 32
Example I²C EEPROM Connection ..................................................................................................... 34
LED Equivalent Circuit ......................................................................................................................... 36
Audio Interface ..................................................................................................................................... 37
Audio Codec Input and Output Stages ................................................................................................ 38
Audio Input Gain .................................................................................................................................. 39
Microphone Biasing ............................................................................................................................. 41
Differential Input ................................................................................................................................... 42
Single-ended Input ............................................................................................................................... 42
Speaker Output .................................................................................................................................... 43
Side Tone ............................................................................................................................................ 44
PCM Interface Master .......................................................................................................................... 46
PCM Interface Slave ............................................................................................................................ 47
Long Frame Sync (Shown with 8-bit Companded Sample) ................................................................. 47
Short Frame Sync (Shown with 16-bit Sample) ................................................................................... 47
Multi-slot Operation with 2 Slots and 8-bit Companded Samples ........................................................ 48
GCI Interface ....................................................................................................................................... 48
16-bit Slot Length and Sample Formats .............................................................................................. 49
PCM Master Timing Long Frame Sync ................................................................................................ 50
PCM Master Timing Short Frame Sync ............................................................................................... 51
PCM Slave Timing Long Frame Sync .................................................................................................. 52
PCM Slave Timing Short Frame Sync ................................................................................................. 53
Digital Audio Interface Modes .............................................................................................................. 54
Digital Audio Interface Slave Timing .................................................................................................... 55
Digital Audio Interface Master Timing .................................................................................................. 56
1.80V and 1.35V Dual-supply Switch-mode System Configuration ..................................................... 58
1.80V Parallel-supply Switch-mode System Configuration .................................................................. 59
1.8V Switch-mode Regulator Output Configuration ............................................................................. 60
1.35V Switch-mode Regulator Output Configuration ........................................................................... 61
1.8V and 1.35V Switch-mode Regulators Outputs Parallel Configuration ........................................... 62
Production Information
© Cambridge Silicon Radio Limited 2013
Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement
Page 11 of 105
CS-303725-DSP5
www.csr.com