CSR8640 Chipset

Bluetooth® audio ROM platform with Qualcomm® cVc™ noise cancellation technology for entry level to mid-range audio devices.

CSR8640, Qualcomm cVc and Qualcomm Kalimba are products of Qualcomm Technologies, Inc., and/or its subsidiaries.

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Product Brief

Ideal for entry-level to mid-range wireless audio products

The CSR8640 SoC has a reduced feature set supporting the essential features expected from Bluetooth audio products while providing cost efficiency for entry-level products.

Integrated single-chip solution for smaller designs

Application processor, Bluetooth and Bluetooth low energy radios, DSP and memory integrated into a single SoC helps reduce system complexity and eBOM while supporting small form factor designs.

No software development required

Pre-loaded Bluetooth and audio applications allow manufacturers to develop end-products without writing code, while customization tools support quick modification of device behaviour and user interface.

cVc 6th generation 2-mic audio technology

cVc technology is a suite of algorithms designed to work on the transmit and receive path of voice calls to deliver optimum voice quality on Bluetooth headsets, handsets, hands-free devices, and automotive.

CSR8640 Block Diagram


  • Bluetooth 4.0 specification compliant

  • Flexible ROM-based platform with fully configurable MMI and tool chain

  • Support for various profiles including: HFP 1.6, A2DP 1.2 AVRCP 1.4

  • 80MHz Qualcomm® Kalimba™ DSP with integrated multipoint A2DP and HFP audio applications

  • 2-mic cVc 6th Generation voice processing technology with wideband speech

  • Audio tuning suite with audio enhancements and 5-band EQs

  • Internal ROM, serial flash memory and EEPOM interfaces

  • MP3, AAC and SBC audio codecs

  • GAIA V1 and associated Android and iOS apps for connectivity with mobile devices

  • Reference speaker and headset applications pre-loaded on the ROM

  • Fast charging support up to 200mA with no external components

  • Pin compatible with CSR8645



DSP Technology: Qualcomm® Kalimba™ DSP


MCU Clock Speed: 80MHz


Bluetooth Version: Bluetooth 4.1

Bluetooth Profiles: HFP v1.6, AVRCP v1.4, A2DP v1.2, DI v1.3, HSP v1.2

A2DP multipoint support: 2 A2DP sources

Bluetooth Radio: Up to +9dBm output power (typical), -92dBm receiver sensitivity (basic rate, typical)


USB Support: Supports USB charger detection

USB Version: USB 2.0 (Full Speed)

General Audio

Audio Technology: HD Voice, Qualcomm® cVc™ audio technology, Talk-Time Extension, Voice recognition technology

Analog Microphone Input: 2 analog mics

Digital Microphone Input: 2 digital mics

Microphone Bias Generator: 1 microphone bias generator

Equalizer: 5-band EQ

HFP multipoint support: 2 handsets

Power Management

Maximum Input Voltage: 3.3V


Maximum Current: 200 mA on chip, 500 mA with external transistor




Supported Interfaces: I²S, I²C, PCM, SPI, UART, USB 2.0




Maximum PIOs: 22

PWM (LED): 3


Package Type: VFBGA

Package Size: 5.5 x 5.5 x 1 mm

Pitch: 0.5mm Pitch