Where to Buy: Alibaba
1. Product Introduction
▫️ Overview
VC Series
Developed by Ai-Thinker Co., Ltd., the VC series modules are AI-enabled offline voice recognition solutions powered by Unisound’s Fengniao M (US516P6) chip. Key features include high wake-up recognition accuracy, extended wake-up range, low false activation rate, enhanced noise immunity, fast response time, and full offline operation independent of internet connectivity.
The modules integrate a 32-bit RISC core with DSP-optimized instruction sets, an FPU for floating-point operations, and an FFT accelerator. They support up to 150 local command recognitions, lightweight RTOS compatibility, and user-friendly customization tools for rapid deployment.
Equipped with versatile interfaces (UART/I2C/PWM/SPI) and comprehensive development tools, the VC series enables straightforward implementation of voice control applications with minimal peripheral requirements.
▫️ Features
- Supports Chinese and English bilingual control
- Single MIC access
- Supports AEC (Acoustic Echo Cancellation) and steady-state noise reduction
- Supports wake-up word self-learning without firmware compilation
- Comprehensive recognition rate of over 98%
- Recognition time less than 100ms
- Extremely low misjudgment rate
- Up to 150 keyword corpus
- No recording supported
- Integrated 32-bit RISC core with a maximum frequency of 240MHz
- Supports DSP instruction set and FPU floating-point arithmetic unit
- FFT accelerator: Maximum support for 1024-point complex FFT/IFFT operations or 2048-point real FFT/IFFT operations
- Unisound customized voice algorithm operators
- Built-in 242KB high-speed SRAM
- 8KB ROM for Boot
- Built-in 2MB SPI FLASH
- Supports 1-channel analog Mic input with SNR≥94dB
- Supports dual-channel DAC output
- Built-in 5V to 3.3V and 3.3V to 1.2V LDO for chip power supply
- Provides a complete RTOS-based SDK
▫️ Selection Table
Expand to search and pick modules by chip, protocol, flash and more.
| Product Image |
| Wireless Protocol |
| Chip |
| Module Flash Size (Mbits) |
| Frequency Band (MHz) |
| Package |
| Dimensions (L×W×H) (mm) |
| Operating Temp Range (℃) |
| Storage Temp Range (℃) |
| Antenna Type |
| Available GPIO |
| Min Voltage (V) |
| Max Voltage (V) |
| Typical Voltage (V) |
| Min Power Current (mA) |
| Rx Current (mA) |
| Deep Sleep Current (μA) |
| Certifications |
| Max TX Power (dBm) |
| Modulation |
2. About Modules
| Module Name | Datasheet | PCB Footprint | Schematic Diagram |
|---|---|---|---|
| VC-01 | View | Download | View Diagram |
| VC-02 | View | Download | View Diagram |
| VC-01-Kit | View | - | View Diagram |
| VC-02-Kit | View | - | View Diagram |
| VC_Burner Debugger | View | - | - |
3. Firmware Related
▫️ Firmware Download, Burning, and Debugging
| Module Model | Firmware ID | Firmware Description | Version | Download Link | Programming Guide |
|---|---|---|---|---|---|
| VC-01/02 | ⭐ #1731 | Standard CN Firmware | V1.0.2 | Download | View Guide |
| VC-01/02 | ⭐ #1732 | Standard EN Firmware | V1.0.2 | Download | View Guide |
| Debugger Exclusive FW | - | - | - | CN | EN | - |
| Serial Programming FW | - | - | - | CN | EN | - |
- Debugger Burning Exclusive Firmware: EN
- Serial Port Burning Exclusive Firmware: EN
- VC Series Module Windows Platform Serial Port Driver Download: Download
4. Development Guide
▫️ AT Command Set
- VC Series Module Factory Command List: EN
🔹 Burning Tools
5. Compliance & Testing
▫️ Hardware Reliability Test Reports
| Module | Report |
|---|---|
| VC-01 | View |
| VC-02 | View |