Ai-Thinker VC-02 Offline Voice Recognition Module
The Ai-Thinker VC-02 Offline Voice Recognition Module is an advanced, cost-effective solution designed to integrate seamless voice control into a variety of applications without requiring an internet connection. Developed by Shenzhen Ai-Thinker Technology Co., Ltd., this module leverages the US516P6 voice chip from Unisound, delivering high reliability and versatility in speech recognition technology. It supports bilingual recognition in Chinese and English, achieving a comprehensive recognition rate exceeding 98% and an identification time of less than 100ms. Capable of handling up to 150 local instructions offline, the VC-02 is ideal for applications ranging from smart home automation to interactive toys and voice-activated appliances.
Features:
- Kernel
- 32bit RISC core, running at 240MHz
- Support DSP instruction set and FPU floating-point operation Unit
- FFT Accelerator: Support 1024-point complex FFT/IFFT operations, or 2048-point real
- FFT/IFFT operations
- Unisound customized speech algorithm operator
- Storage
- Built-in 242KB high-speed SRAM
- Built-in 2MB FLASH
- Audio input and output
- Supports 1 analog Mic input, SNR ≥ 94dB
- Support 4-channel digital Mic input
- Support dual-channel DAC output
- Supports I2S input/output
- Power supply and clock
- Support 3.6 V-5V Range Power Input
- Built-in 5V to 3.3V,3.3V to 1.2V LDO power the chip
- RC 12MHz clock source and PLL locked loop clock source
- Built-in POR(Power on Reset), low voltage detection and watchdog
- Peripheral
- All GPIOs can be configured as external interrupt input and wake-up source
- 1 full-duplex UART with a maximum rate of 3Mbps.
- Support SPI, I2C, ADC, PWM interface
- SDK
- Provides complete RTOS-based SDK
- Support fast and convenient UART, I2C and other control protocol development
Specifications:
| Category | Specification |
|---|---|
| Model | VC-02 |
| Package | SMD-20 |
| Dimension | 18mm × 17mm × 3.2mm(±0.2 mm) |
| Working Temperature | -40°C ~ 85°C |
| Storage Environment | -40°C ~ 125°C, <90% RH |
| Power Supply | 3.6V ~ 5V, current >500mA |
| Interfaces | UART/I²C/PWM/SPI/GPIO |
| I/O Pins | 10 |
| UART Rate | Default 115200 bps |
| SPI Flash | 2MB (built-in) |
Pin Configuration:
| in # | Name | Function Description |
|---|---|---|
| 1 | DAC_R | Reserved R-channel audio output (not currently supported) |
| 2 | MIC- | MIC- Input |
| 3 | MIC+ | MIC+ Input |
| 4 | TX1 | GPIO_B6 / UART1_TXD, 3.3V level |
| 5 | RX1 | GPIO_B7 / UART1_RXD, 3.3V level |
| 6 | IOA25 | IO / ADC4 / SPI_MISO |
| 7 | NC | Hanging (No Connection) |
| 8 | SDA | GPIO_B3 / I2C_SDA / TIM4_PWM, 3.3V level |
| 9 | SCL | GPIO_B2 / I2C_SCL / TIM3_PWM, 3.3V level |
| 10 | IOB0 | IO / UART1_TXD / I2C_SCL / TIM3_PWM |
| 11 | IOB1 | IO / UART1_RXD / I2C_SDA / TIM4_PWM |
| 12 | NC | Hanging (No Connection) |
| 13 | IOA26 | IO / ADC5 / SPI_CLK |
| 14 | DAC_L | Reserved L-channel audio output (not currently supported) |
| 15 | IOB8 | IO / Virtual Software UART-TX (Log Output Pin) |
| 16 | IOA27 | IO / US_SPIM_MOSI |
| 17 | VCC | 3.6-5V power input |
| 18 | GND | Ground |
| 19 | SPK- | SPK- (8Ω 2W) |
| 20 | SPK+ | SPK+ (8Ω 2W) |
Applications:
- Smart home automation: voice-controlled lights, fans, and other appliances.
- Interactive toys: robots or dolls that respond to voice commands.
- Voice-activated switches for controlling electrical devices.
- Simple voice assistants for basic tasks like setting timers or alarms.
- Educational tools for language learning through voice interaction.
Package Include:
- 1x Ai-Thinker VC-02 Offline Voice Recognition Module.
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