Synaptics(R) CX20924 4-mic Far-Field Voice Input Processor SoC AudioSmart(R) Product Brief Four-Microphone Far-Field Input Subsystem with Integrated Low-Power Wake Word The Synaptics CX20924 is a high-performance, 4-mic far-field voice input processor System-on-Chip (SoC). The CX20924 is the first product in this category with an integrated voice trigger function that supports a low system power Wake-on-Voice (WoV) function and 360-degree Smart Source Locator (SSL) that detects user's location around the device. The device includes a Pulse Density Modulated (PDM) interface with digital decimation filters that supports up to four high-performance digital microphones, a powerful dual core 32-bit hardware Digital Signal Processor (DSP), and integrated power management. When the PDM microphone and DSP are active in the WoV mode, the device consumes less than 70mW, which is well below the 0.5W EC 1275/2008 requirement for standby power. Key Features * * * AudioSmart(R) far-field voice input processing software Combined with Synaptics' suite, including four-microphone Smart Source Pickup (SSP) noise suppression and full-duplex Acoustic Echo Cancellation (AEC), the CX20924 is the ideal turnkey solution for adding voice control, 360-degree SSL, voice search, and Voice over Internet Protocol (VoIP)/speakerphone functionalities to SmartTV, Smart Speakers, Set-Top Box (STB), Smart appliances, and many tabletop consumer electronics devices. The CX20924 device supports four digital microphones using two stereo digital PDM microphone external interfaces. Each Digital Microphone Interface (DMIC) supports sample rates from 8kHz to 96kHz. The CX20924 assists manufacturers and developers to prototype and develop Amazon AlexaTM-enabled devices. Synaptics' proprietary far-field AudioSmart algorithms leverage the built-in hardware to deliver a superior voice interactive experience in the most challenging room environments. The voice processing chain also supports multiple modes of processing, which are independently optimized for voice communication and automatic speech recognition. * 4-mic SSL identified the user's direction in 360 degrees. Low-power WoV mode with embedded third-party voice wake-up engine Enables premium-performance Automatic Speech Recognition (ASR) and excellent voice clarity with four microphones using Synaptics' AudioSmart voice input processing software, which includes: o 4-mic SSP noise suppression o Full-duplex AEC Compatible with multiple leading embedded and server-based speech recognition vendors Applications * * * * Voice-controlled Smart TV/STB Smart Bluetooth/WiFi speaker Voice interactive smart appliances Internet of Things (IoT) devices System Block Diagram PCM DC/DC PLL DMAs Timers Debug I2S Out Far Field Voice Trigger Voice Engine Algorithms Full Speed USB DSP CORE Memory Bridge MCLK Out Echo Ref. I2S/SPDIF 4 x DMIC I2C Slave SPI FLASH I/F UART GPIO Published November 7, 2017. Copyright (c) 2017 Synaptics Incorporated. All rights reserved. WoV Interrupt PN: 190-000281-01 Rev. A Synaptics(R) CX20924 4-mic Far-Field Voice Input Processor SoC AudioSmart Product Brief Additional Features * Powerful, dual-core 32-bit DSP * I2S serial data interfaces * I2C serial control interface * USB 2.0 full-speed compliant audio data and control interface * Serial Peripheral Interface (SPI) for low-cost flash support * Supports four MEMS digital microphones using two stereo data pins * Only supports digital microphones * 7x7mm 60 QFN package Ordering Information Ordering Part Number Part Number Description Package Conditions CX20924-21Z CX20924 Four-Microphone Far-Field Voice Processor SoC 60 QFN 7x7mm 0 to 70C The devices in this publication are lead-free (Pb-Free) and China RoHS compliant. Contact your local Synaptics sales office for advanced software options. Trademarks Synaptics, the Synaptics logo, and AudioSmart, are trademarks or registered trademarks of Synaptics Incorporated or its affiliates in the United States and/or other countries. Notice Use of the materials may require a license of intellectual property from a third party or from Synaptics. This document conveys no express or implied licenses to any intellectual property rights belonging to Synaptics or any other party. Synaptics may, from time to time and at its sole option, update the information contained in this document without notice. INFORMATION CONTAINED IN THIS DOCUMENT IS PROVIDED "AS-IS," WITH NO EXPRESS OR IMPLIED WARRANTIES, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND ANY WARRANTIES OF NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT SHALL SYNAPTICS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE INFORMATION CONTAINED IN THIS DOCUMENT, HOWEVER CAUSED AND BASED ON ANY THEORY OF LIABILITY, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, AND EVEN IF SYNAPTICS WAS ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. IF A TRIBUNAL OF COMPETENT JURISDICTION DOES NOT PERMIT THE DISCLAIMER OF DIRECT DAMAGES OR ANY OTHER DAMAGES, SYNAPTICS' TOTAL CUMULATIVE LIABILITY TO ANY PARTY SHALL NOT EXCEED ONE HUNDRED U.S. DOLLARS. Published November 7, 2017. Copyright (c) 2017 Synaptics Incorporated. All rights reserved. PN: 190-000281-01 Rev. A