WTK6900HA-16S Voice Recognition Chip
Low‑Cost, High‑Reliability Offline Voice Trigger in SOP16 Package
The WTK6900HA-16S is a cost‑effective offline voice trigger chip built on a 192MHz 32‑bit core with hardware floating‑point support. It integrates 512KB or 1MB SPI Flash and employs advanced neural network‑based speech recognition with 3‑meter far‑field capability. The chip features robust noise suppression, low false‑wake rates, and fast response, making it ideal for voice‑controlled appliances.
- 192MHz CPU with floating‑point unit
- 3m far‑field reliable recognition
- 512KB/1MB embedded SPI Flash
- 95dB SNR DAC & 90dB SNR ADC
- UART control with simple protocol
Key Features
Technical Specifications
| Parameter | Value / Condition |
|---|---|
| CPU Frequency | 192 MHz (with FPU) |
| Flash Memory | 512KB (HA4) or 1MB (HA8) |
| DAC | Two 16‑bit channels, SNR ≥ 95dB |
| ADC | Single 16‑bit, SNR ≥ 90dB |
| Audio Formats | MP3, WAV (8/11.025/16/22.05/24/32/44.1/48 kHz) |
| Supply Voltage | 2.8V – 5.2V |
| IO Level | 3.3V TTL |
| Microphone | Single analog MIC with built‑in bias |
| UART Baud Rate | 115200 (configurable) |
| 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 (left) |
| 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 (reserved) |
| 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 commands also supported (see datasheet).
Applications
Why Choose WTK6900HA-16S
FAQs
What is the WTK6900HA-16S?
A low‑cost voice recognition chip in SOP16 package, with 192MHz CPU, 3m far‑field, and UART control.
What is the recognition range?
Up to 3 meters in typical environments.
What Flash sizes are available?
512KB (HA4) or 1MB (HA8) SPI Flash.
What audio formats are supported?
MP3 and WAV at various sample rates.
What is the operating voltage?
2.8V – 5.2V, making it suitable for battery‑powered devices.
Important: The chip requires an external 24MHz crystal. UART is 3.3V TTL – level shifting may be needed for 5V systems. For custom voice models, use the Waytronic online platform. Refer to the full datasheet for design guidelines.
