WTK6900HA-24SS Voice Recognition Chip
Versatile Offline Voice Trigger with Extended I/O in SSOP24
The WTK6900HA-24SS offers the same high‑performance 192MHz core and neural‑network voice recognition as the 16‑pin variant, but in a SSOP24 package with additional GPIOs for more complex applications. It supports 3‑meter far‑field pickup, MP3/WAV playback, and flexible UART control, making it perfect for smart appliances with multiple I/O needs.
- 192MHz CPU with FPU
- 3m far‑field reliable recognition
- 512KB/1MB SPI Flash
- More GPIO than SOP16 version
- UART & USB programming
Key Features
Technical Specifications
| Parameter | Value / Condition |
|---|---|
| CPU Frequency | 192 MHz (with FPU) |
| Flash Memory | 512KB (HA4) or 1MB (HA8) |
| DAC | Two 16‑bit, SNR ≥ 95dB |
| ADC | Single 16‑bit, SNR ≥ 90dB |
| Audio Formats | MP3, WAV (multiple sample rates) |
| Supply Voltage | 2.8V – 5.2V |
| IO Level | 3.3V TTL |
| Microphone | Single analog MIC with bias |
| UART | 1 full‑duplex UART |
| Operating Temperature | –40°C ~ +85°C |
| Package | SSOP24 (24‑pin) |
Pin Description – SSOP24
| Pin | Name | Function |
|---|---|---|
| 1 | RX | UART receive |
| 2 | TX | UART transmit |
| 3 | DAT | Programming data |
| 4 | CLK | Programming clock |
| 5 | P04 | I/O |
| 6 | P03 | I/O |
| 7 | MICLDO | Microphone power |
| 8 | MIC+ | Microphone input |
| 9 | P00 | I/O |
| 10 | DACVSS | DAC ground |
| 11 | VCM | Reference (105 cap to GND) |
| 12 | DAC_L | DAC left output |
| 13 | P23 | I/O |
| 14 | P22 | I/O |
| 15 | P20 | I/O |
| 16 | P21 | I/O (BUSY) |
| 17 | VCC | Power input |
| 18 | VOUT | External memory power (105 cap) |
| 19 | P17 | I/O |
| 20 | GND | Ground |
| 21 | NG | Not connected |
| 22 | VREG | Regulator (105 cap to GND) |
| 23 | OSCI | 24MHz crystal input |
| 24 | OSCO | 24MHz crystal output |
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” | 7E 06 FF 06 01 02 0E EF |
| “关闭灯光” | 7E 06 FF 06 01 03 0F EF |
| “调亮灯光” | 7E 06 FF 06 01 04 10 EF |
| “调暗灯光” | 7E 06 FF 06 01 05 11 EF |
| “音量增大” | 7E 06 FF 06 01 09 15 EF |
| “音量减小” | 7E 06 FF 06 01 0A 16 EF |
Applications
Why Choose WTK6900HA-24SS
FAQs
What is the difference between HA-16S and HA-24SS?
Package and pin count – HA-24SS has 24 pins with additional I/O ports.
What is the recognition range?
Up to 3 meters.
Is external Flash needed?
No, the chip integrates SPI Flash (512KB or 1MB).
Can I update voice commands?
Yes, via the Waytronic online platform and programming interface.
Note: The chip requires a 24MHz crystal and proper decoupling capacitors. UART is 3.3V. For custom voice models, visit the Waytronic voice platform.
