Product Introduction
The WTK6900HA Recognition module serves as the recognition component for the local voice-triggered engine. This module leverages the most advanced deep neural network (DNN-HMM) speech recognition technology currently available, achieving high recognition rates, real-time performance, integration of local and cloud capabilities, and highly integrated voice recognition and processing functions; it can also achieve semantic recognition and other specific intelligent voice interaction effects. Additionally, the module possesses conventional MCU control and computational processing capabilities, enabling various applications requiring communication and control. In terms of application, the module supports local voice detection and wake-up functions, offers offline far-field recognition up to 1-3 meters away, and accommodates 150 offline command entries. The module can push commands to the existing host device via UART, implementing a simple voice interaction interface. The solution supports both Chinese and English, and can be widely applied in home appliances, lighting, toys, wearable devices, and other product fields to realize voice interaction and control, as well as various intelligent voice solutions.
Module features
Kernel and Storage
• CPU clock speed up to 160 MHz, supports hardware floating-point operations
• Built-in 1 MByte SPI Flash memory
AI Algorithms
• Offline voice recognition using the latest neural network algorithms, offering high accuracy and low error rates, reliable recognition at distances up to 3 meters
• Voice noise reduction algorithm: filters out steady-state noise and effectively suppresses dynamic noise, ensuring accurate recognition even in noisy environments
Audio
• Single-channel 16-bit DAC, SNR ≥ 95 dB
• Single-channel 16-bit ADC, SNR ≥ 90 dB
• Supports sampling rates of 8 kHz / 11.025 kHz / 16 kHz / 22.05 kHz / 24 kHz / 32 kHz / 44.1 kHz / 48 kHz
• Single analog MIC input, with built-in MIC bias voltage output
Power Supply
• VCC: 2.2V to 5.5V
• VOUT: 2.2V to 3.6V
Peripherals
• Six multifunctional 32-bit timers, supporting capture and PWM modes
• One full-speed USB 2.0 OTG controller
• One full-duplex UART
• External wake-up / interrupt on all GPIOs
Operating Temperature
• Operating temperature range: -40°C to +85°C
• Storage temperature range: -65°C to +150°C
Package
• QSOP24
Application Areas
• Smart home appliances (household appliances, health appliances, kitchen appliances, etc.)
• Smart bathroom, smart lighting, smart electromechanics, smart home
• Smart toys
Pin definition
WTK6900HA-24SS As shown in Figure 1, the physical pinout is illustrated; as shown in Figure 2, the module package pinout is depicted. Please carefully verify the pin connections before powering on for use.
Figure 1 – WTK6900HA-24SS module pinout diagram
| Pin NO | Signal name | Functional description |
| 1 | MIC+ | Connect the positive terminal of the microphone |
| 2 | MIC- | Connect the negative terminal of the microphone |
| 3 | SPK+ | The positive terminal of the speaker connection is properly aligned. |
| 4 | SPK- | Negative terminal of the speaker connection |
| 5 | WTK6900HA-24SS | Voice recognition chip |
| 6 | WT8002 | Power amplifier chip |
| 7 | Horn operation indicator light | The light turns red when not working and goes off when it is working. |
| 8 | Power indicator light | The green light is on when power supply is normal, and it goes off when there is no power supply. |
| 9 | VCC | Power input（2.2.~5.5V） |
| 10 | GND | GND |
| 11 | TX | UART Asynchronous serial data output |
| 12 | RX | UART Asynchronous serial data input |
| 13 | Power supply port | TYPE-C power supply input（5V/1A/2A） |
Figure 2 – Physical Pin Description of WTK6900HA-24SS
Figure 3 – WTK6900HA-24SS module pinout diagram
Circuit design reference
