WTK6900HC-M02 Voice Recognition Module
240MHz AI Core · 5–8m Far‑Field · Bluetooth 5.1 · 1MB Flash · SOP16 Module
The WTK6900HC-M02 is a compact voice recognition module based on the WTK6900HC chip in SOP16 package. It features a 240MHz 32‑bit core with hardware FPU, 1MB SPI Flash, and advanced DNN‑HMM neural network algorithms for 5–8 meter far‑field voice pickup. With integrated Bluetooth 5.1, onboard amplifier (WT8002), and Type‑C power input, this module provides a complete turnkey solution for smart voice control.
- 240MHz CPU with floating‑point unit
- 5–8m far‑field reliable recognition
- Bluetooth 5.1 (BR/EDR/BLE)
- 1MB SPI Flash
- Low power 25–30mA (active)
- No external crystal required
Key Features
Technical Specifications
| Parameter | Value / Condition |
|---|---|
| CPU Frequency | 240 MHz (with FPU) |
| Flash Memory | 1 MB (SPI) |
| DAC | 16‑bit, SNR ≥ 95dB |
| ADC | 16‑bit, SNR ≥ 90dB |
| Audio Formats | MP3, WAV (8–48 kHz) |
| Bluetooth | V5.1+BR+EDR+BLE, +6dBm Tx, –90dBm Rx |
| Supply Voltage | 3.3V – 5.5V (5V typical) |
| IO Level | 3.3V TTL |
| Microphone | Electret (ECM) with built‑in bias |
| Speaker Output | 8Ω / 1W (via WT8002) |
| UART | 1 full‑duplex UART |
| Operating Temperature | –40°C ~ +85°C |
| Module Dimensions | 40 × 30 × 6.55 mm |
| Package | SOP16 (on module) |
Pin Description – 13‑Pin Interface
| Pin | Name | Function |
|---|---|---|
| 1 | MIC+ | Microphone positive |
| 2 | MIC− | Microphone negative |
| 3 | SPK+ | Speaker positive (8Ω 1W) |
| 4 | SPK− | Speaker negative |
| 5 | WT8002 | Onboard amplifier IC |
| 6 | Chip | WTK6900HC-16S (SOP16) |
| 7 | LED (SPK) | Red when idle, off when working |
| 8 | LED (TX) | Green when TX active |
| 9 | VCC | Power input (3.3–5.5V) |
| 10 | GND | Ground |
| 11 | TX | UART transmit (3.3V) |
| 12 | RX | UART receive (3.3V) |
| 13 | Type‑C | 5V power input (1A/2A) |
Command Output Examples
| Command | UART Output (Hex) |
|---|---|
| Power‑on (auto) | 7E 06 FF A0 00 03 AF EF |
| Wake‑up: “小蜂管家” | 7E 06 FF 06 01 01 0D EF |
| “打开灯光” (Turn on light) | 7E 06 FF 06 01 02 0E EF |
| “关闭灯光” (Turn off light) | 7E 06 FF 06 01 03 0F EF |
| “调亮灯光” (Brighten) | 7E 06 FF 06 01 04 10 EF |
| “调暗灯光” (Dim) | 7E 06 FF 06 01 05 11 EF |
| 10s idle exit | 7E 06 FF 06 01 0A 16 EF |
Protocol: 7E + Length + Ext + Cmd + ID + Checksum + EF. Passive playback and volume control supported.
Applications
Why Choose WTK6900HC-M02
FAQs
What is the WTK6900HC-M02?
A voice recognition module based on WTK6900HC chip in SOP16 package, with 240MHz CPU, 1MB Flash, Bluetooth 5.1, and 5–8m far‑field.
What is the recognition range?
5–8 meters in quiet environments.
Does WTK6900HC-M02 require an external crystal?
No, WTK6900HC-M02 uses an internal RC oscillator.
What power supply is needed?
3.3–5.5V, with Type‑C port for 5V input.
Can I update the voice commands?
Yes, via OTA or the Waytronic online platform.
Note: The module includes onboard WT8002 amplifier (1W/8Ω). UART is 3.3V TTL. For custom command sets, contact Waytronic or use the online voice platform.
