WTV380C-8S Audio Stream Decoding Chip
32‑Bit RISC‑V Core with UART Streaming, Built‑in 0.5W Amplifier & Voice Replacement
The WTV380C-8S is a high‑performance audio stream decoding chip featuring a 32‑bit RISC‑V processor core running up to 160MHz. It integrates a built‑in Class‑D 0.5W amplifier for 8Ω/0.5W speakers with 90dB SNR, a 16‑bit ADC (98dB SNR), and supports UART streaming control for real‑time audio decoding. With serial port‑based voice content replacement, simultaneous playback and download, and multiple Flash capacity options (C0/C3/C4/C6), the WTV380CX revolutionizes audio output while addressing industry challenges of poor sound quality and memory constraints.
- 32‑bit RISC‑V – 160MHz high‑performance core
- UART streaming – real‑time audio decoding
- Built‑in 0.5W amp – Class‑D, 90dB SNR
- 16‑bit ADC – 98dB SNR precision
- Voice replacement – serial port updates
Flash Capacity Options
| Model | Flash Capacity | Key Features |
|---|---|---|
| WTV380C0 | 32 Kbit | Cost‑down version, audio stream decoding only, 10‑second voice storage |
| WTV380C6 | 16 Mbit | Serial port voice replacement, audio stream decoding, live streaming + storage |
| WTV380C4 | 4 Mbit | Serial port voice replacement, audio stream decoding, live streaming + storage |
| WTV380C3 | 32 Mbit | Serial port voice replacement, audio stream decoding, live streaming + storage |
Contact Waytronic sales for detailed pricing and customization options.
WTV380C-8S Key Features
Technical Specifications
| Parameter | Value / Condition |
|---|---|
| Processor Core | 32‑bit RISC‑V, up to 160MHz |
| Operating Voltage | 2.0V – 5.5V |
| Amplifier Output | Class‑D 0.5W, 8Ω speaker, 90dB SNR |
| ADC Resolution | 16‑bit, 98dB SNR |
| Control Interface | UART (default 115200 baud, configurable to 2,000,000) |
| Volume Levels | 32 (00H – 1FH, with power‑off memory) |
| Flash Capacity Options | 32Kbit (C0), 4Mbit (C4), 16Mbit (C6), 32Mbit (C3) |
| Voice Addresses | Up to 65,535 (0000H – FFFFH) |
| Peripherals | SPI, I2C, 2‑channel 10‑bit SAR ADC, 3 timers, Watchdog |
| VOUT LDO | 3.3V output, up to 150mA |
| Operating Temperature | ‑40°C ~ +85°C |
| Storage Temperature | ‑65°C ~ +150°C |
| Package | SOP8 |
UART Command Highlights
| Command | Function | Description |
|---|---|---|
| A0 | Index Playback | Play audio by Flash index (0000H–FFFFH) |
| AB | Stop | Stop current playback |
| AE | Volume Control | Set volume (00–1F, 32 levels) |
| AD | Volume Up | Increase volume by one level |
| AC | Volume Down | Decrease volume by one level |
| AF | Loop Mode | Set single loop / all loop playback |
| B0 | Combined Playback | Play up to 20 tracks in sequence |
| FB | Baud Rate Change | Switch baud rate (8 fixed options) |
| C0 | Query Version | Read firmware version |
| B8 | Low‑Power Mode | Enter sleep mode |
UART Streaming Media Control Protocol
| Frame | Function | Description |
|---|---|---|
| 00 | Index Playback (Download + Play) | Play downloaded content by index |
| 01 | Stream Playback Start | Start decoding with 512‑byte MP3 frame |
| 02 | Stream Playback Transmission | Transmit 512‑byte MP3 data packet |
| 03 | Stream Playback End | End streaming playback |
| 04 | Broadcast While Downloading | Start frame with 512‑byte MP3 data |
| 05 | Handshake (Data Transmission) | Create Flash space, check storage |
| 06 | Query Remaining Capacity | Check remaining live streaming space |
| 07 | Delete All Indexes | Delete all edge‑down edge‑broadcast indexes |
| 08 | Delete Specified Index | Delete specified track index |
| 10 | Single‑Track Handshake | Prepare single‑track download |
| 09 | Single‑Track Data | Transmit single‑track data packet |
UART Bin File Update Protocol
| Frame | Function | Description |
|---|---|---|
| FD | Handshake | Start bin file update with file size and CRC32 |
| F0 | Data Transfer | Transfer bin file data packets |
| FE | Integrity Check | Verify CRC32 after update completion |
Pin Functions (SOP8)
| Pin | Name | Function |
|---|---|---|
| 1 | VOUT | 3.3V LDO power output |
| 2 | P25 / BUSY | Audio output indicator / BUSY signal |
| 3 | RX | UART receive (serial data input) |
| 4 | TX | UART transmit (serial data output) |
| 5 | PWMN | Speaker negative terminal (PWM output) |
| 6 | VCC | Power input (2.0V – 5.5V) |
| 7 | PWMP | Speaker positive terminal (PWM output) |
| 8 | GND | Ground |
Application Scenarios
Why Choose WTV380C-8S
Frequently Asked Questions
What is the WTV380CX?
WTV380C-8S is an audio stream decoding chip with a 32-bit RISC-V processor core running up to 160MHz. It supports UART streaming control, built-in 0.5W Class-D amplifier, and serial port-based voice content replacement.
What are the available Flash capacity options?
The WTV380C-8S series offers multiple Flash capacity options: C0 (32Kbit, cost-down version), C6 (16Mbit), C4 (4Mbit), and C3 (32Mbit). For details, contact Waytronic sales.
What control interface does it use?
It uses a standard UART serial interface with default baud rate 115200, configurable up to 2,000,000 baud. The 3.3V TTL interface supports a comprehensive command set.
Does it support streaming audio playback?
Yes. It supports UART streaming media control with dedicated frames for starting, transmitting, and ending stream playback. It also supports simultaneous playback and download (broadcasting while downloading).
What audio output does it provide?
It features a built-in Class-D 0.5W amplifier supporting 8Ω/0.5W speakers with 90dB SNR. The chip also provides PWM output and supports DAC output for external amplifier connections.
What is the operating voltage range?
The chip operates from 2.0V to 5.5V, with 3.3V LDO output (VOUT) for powering external circuits.
Can voice content be updated in the field?
Yes. The chip supports UART-based bin file updates via handshake (FD), data transfer (F0), and integrity check (FE) frames, enabling field updates without removing the chip.
What is the operating temperature range?
The chip operates from -40°C to +85°C with a storage temperature range of -65°C to +150°C.
What package is available?
The WTV380C-8S is available in an SOP8 package, providing a compact footprint for space-constrained designs.
What are the typical applications?
Cleaning appliances (floor washers, vacuum cleaners, range hoods), small home appliances, electronic locks, electric vehicles, audio playback toys, security surveillance, dashcams, in-car entertainment, smart home devices, and audio speakers.
Important: Capacitors must be placed within 1.5–2mm of the chip’s power pins. VOUT provides 3.3V LDO output (up to 150mA) for external circuits. When using DAC output with an external amplifier, configure the BUSY pin to match the amplifier’s enable logic. The chip requires 500mA current headroom when using a step-down power supply. For voice replacement and bin updates, ensure the correct handshake sequence (FD → F0 → FE) is followed.
