WTK6900HC8-24SS Voice Recognition Chip
240MHz AI Core · 5m Far‑Field · 1MB Flash · Bluetooth 5.1 · SSOP24
The WTK6900HC8-24SS offers the same 240MHz core and 5‑meter far‑field performance as the 16‑pin variant, but in a SSOP24 package with additional I/O pins. It integrates 1MB SPI Flash and supports Bluetooth 5.1 for wireless connectivity. With a 95dB SNR DAC and 90dB SNR ADC, it delivers high‑fidelity audio for voice interaction in smart appliances, industrial systems, and automotive environments.
- 240MHz CPU with FPU
- 5m far‑field reliable recognition
- 1MB SPI Flash
- Bluetooth 5.1
- More GPIO for complex designs
Key Features
Technical Specifications
| Parameter | Value / Condition |
|---|---|
| CPU Frequency | 240 MHz (with FPU) |
| Flash Memory | 1 MB (SPI) |
| DAC | Two 16‑bit, SNR ≥ 95dB |
| ADC | Single 16‑bit, SNR ≥ 90dB |
| Audio Formats | MP3, WAV |
| Bluetooth | V5.1+BR+EDR+BLE |
| Supply Voltage | 2.8V – 5.2V |
| IO Level | 3.3V TTL |
| Interfaces | UART, SPI, USB |
| Operating Temperature | –40°C ~ +85°C |
| Package | SSOP24 (24‑pin) |
Pin Description – SSOP24
| Pin | Name | Function |
|---|---|---|
| 1 | ICEDAT/D− | Programming data / USB D− |
| 2 | ICECLK/D+ | Programming clock / USB D+ |
| 3 | RX | UART receive |
| 4 | TX | UART transmit |
| 5 | LED0/BUSY | LED or busy output |
| 6 | AGND | Analog ground |
| 7 | MICLDO | Microphone power |
| 8 | MIC+ | Microphone input |
| 9 | VOUT | External memory power (106 cap to GND) |
| 10 | GND | Ground |
| 11 | VCM | Reference (105 cap to GND) |
| 12 | DAC | DAC audio output |
| 13 | DO/PWM0 | SPI data / PWM channel 0 |
| 14 | CLK/PWM1 | SPI clock / PWM channel 1 |
| 15 | CS | SPI chip select |
| 16 | VREG | Regulator (105 cap to GND) |
| 17 | VCC | Power input |
| 18 | IO2 | I/O |
| 19 | IO3 | I/O |
| 20 | IO4 | I/O |
| 21 | IO5 | I/O |
| 22 | ANT | Antenna (Bluetooth) |
| 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 WTK6900HC8-24SS
FAQs
What is the difference between WTK6900HC8-24SS and HC6-16S?
Package and Flash size: WTK6900HC8-24SS has 1MB Flash and SSOP24 package, HC6-16S has 2MB Flash and SOP16.
Does WTK6900HC8-24SS support SPI?
Yes, WTK6900HC8-24SS has a dedicated SPI interface.
What is the recognition range?
Up to 5 meters.
Can I use it without Bluetooth?
Yes, Bluetooth is optional; you can use it purely for voice recognition.
Note: Requires 24MHz crystal and proper decoupling. UART is 3.3V. For custom voice models, use the Waytronic online platform.
