WTK6900HC6-16S Voice Recognition Chip
240MHz AI Core · 5m Far‑Field · 2MB Flash · Bluetooth 5.1 · SOP16
The WTK6900HC6-16S is a powerful offline voice trigger chip with a 240MHz 32‑bit core and hardware floating‑point unit. It integrates 2MB SPI Flash and employs advanced neural‑network based speech recognition for 5‑meter far‑field pickup. With Bluetooth 5.1 support, it enables wireless audio streaming and command transmission. The chip delivers 95dB SNR audio DAC and 90dB SNR ADC, making it ideal for high‑quality voice interaction in smart home and industrial products.
- 240MHz CPU with FPU
- 5m far‑field reliable recognition
- 2MB embedded SPI Flash
- Bluetooth 5.1 (BR/EDR/BLE)
- 95dB SNR DAC & 90dB SNR ADC
- UART control with simple protocol
Key Features
Technical Specifications
| Parameter | Value / Condition |
|---|---|
| CPU Frequency | 240 MHz (with FPU) |
| Flash Memory | 2 MB (SPI) |
| DAC | Two 16‑bit channels, SNR ≥ 95dB |
| ADC | Single 16‑bit, SNR ≥ 90dB |
| Audio Formats | MP3, WAV (8–48 kHz) |
| Bluetooth | V5.1+BR+EDR+BLE, +6dBm Tx, –90dBm Rx |
| Supply Voltage | 2.8V – 5.2V |
| IO Level | 3.3V TTL |
| Microphone | Single analog MIC with built‑in bias |
| UART | 1 full‑duplex UART |
| Operating Temperature | –40°C ~ +85°C |
| Storage Temperature | –65°C ~ +150°C |
| Package | SOP16 (16‑pin) |
Pin Description – SOP16
| Pin | Name | Function |
|---|---|---|
| 1 | DACL | DAC audio output |
| 2 | P21/BUSY | I/O or busy indicator |
| 3 | VCC | Power input (2.8–5.2V) |
| 4 | VOUT | External memory power (connect 105 cap to GND) |
| 5 | P17/DATA | I/O or data |
| 6 | ANT | Antenna (for Bluetooth) |
| 7 | OSCI | 24MHz crystal input |
| 8 | OSCO | 24MHz crystal output |
| 9 | RX | UART receive |
| 10 | TX | UART transmit |
| 11 | ICEDAT/D− | Programming data / USB D− |
| 12 | ICECLK/D+ | Programming clock / USB D+ |
| 13 | MICLDO | Microphone power supply |
| 14 | MIC+ | Microphone input |
| 15 | GND | Ground |
| 16 | VMID | Internal reference (connect 105 cap to GND) |
Command Output Examples
| Command | UART Output (Hex) |
|---|---|
| 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 |
| “音量增大” (Volume up) | 7E 06 FF 06 01 09 15 EF |
| “音量减小” (Volume down) | 7E 06 FF 06 01 0A 16 EF |
Protocol: 7E + Length + Ext + Cmd + ID + Checksum + EF. Passive playback and volume control supported.
WTK6900HC6-16S Applications
Why Choose WTK6900HC6-16S
FAQs
What is the WTK6900HC6-16S?
A voice recognition chip with 240MHz CPU, 2MB Flash, 5m far‑field, and Bluetooth 5.1 in SOP16 package.
What is the recognition range?
Up to 5 meters.
Does WTK6900HC6-16S support Bluetooth audio?
Yes, WTK6900HC6-16S supports A2DP, HFP, and other profiles for audio streaming and hands‑free.
What is the Flash size?
2 MB SPI Flash.
What is the operating voltage?
2.8V – 5.2V.
Note: Requires an external 24MHz crystal and proper antenna design for Bluetooth. UART is 3.3V TTL. Custom voice models can be created via the Waytronic online platform.
