WT2003H4-16S MP3 Player Chip | 0.5W Audio IC | Waytronic
SOP16 Voice Chip with 180KB Built‑in Voice, 32‑Bit DSP & UART Control
The WT2003H4-16S is a high‑performance SOP16 MP3 voice chip powered by a 32‑bit DSP up to 120MHz. It features 180KB of built‑in voice storage (approx. 90s at 16kbps MP3) and supports external SPI‑Flash, TF card, and USB drive storage. With UART control (default 9600 baud), 32‑level volume control, and a built‑in 0.5W Class‑D amplifier, it is ideal for voice prompt systems, home appliances, and automotive applications.
- 32‑bit DSP – 120MHz processing
- 180KB voice – built‑in storage
- UART control – 9600 default baud
- 32‑level volume – with power‑off memory
- Built‑in 0.5W amp – direct speaker drive
Key Features
WT2003H4-16S Specifications
| Parameter | Value |
|---|---|
| Package | SOP16 |
| Processor | 32‑bit, up to 120MHz |
| Operating Voltage | 2.6V – 5.0V |
| Built‑in Voice | 180KB (~90s @ 16kbps MP3) |
| Audio Format | MP3, WAV (8–44.1kHz, 8–320kbps) |
| Audio Output | PWM (0.5W) / DAC |
| Volume Levels | 32 (0–31, power‑off memory) |
| External Storage | SPI‑Flash (128Mbit), TF (32GB), USB (32GB) |
| Control Interface | UART (9600 default) |
| Deep Sleep | < 5 µA |
| Operating Temp | ‑40°C ~ +85°C |
Key Pin Functions WT2003H4-16S (SOP16)
| Pin | Name | Function |
|---|---|---|
| 6 | RXD | UART receive |
| 7 | LED3/KEY12/ADC0 | Multi‑function I/O |
| 8 | AGND | Analog ground |
| 9 | LED4/KEY13/DAC | DAC output |
| 10 | VOUT | External memory power |
| 11 | VCC | Power (2.6–5.0V) |
| 12 | GND | Digital ground |
| 13 | PWM+ | Speaker positive |
| 14 | PWM− | Speaker negative |
| 15 | BUSY | Busy signal (high during playback) |
| 16 | TXD | UART transmit |
Applications
Frequently Asked Questions
What control interface does WT2003H4-16S use?
It uses standard UART serial communication with default baud rate 9600, configurable up to 921600.
What is the built-in voice storage capacity?
WT2003H4-16S provides 180KB of built-in voice storage, offering approximately 90 seconds at 16kbps MP3.
What storage media are supported?
It supports external SPI-Flash (up to 128Mbit), TF card (up to 32GB), and USB drive (up to 32GB).
Does it have a built-in amplifier?
Yes, it features a built-in 0.5W Class-D amplifier with PWM output. DAC output is also available with a command switch (B6).
How many volume levels are available?
32 levels (0 to 31), with 0 = mute and 31 = maximum volume. The setting has power-off memory.
What is the operating voltage range?
The chip operates from 2.6V to 5.0V, with ripple controlled within 5% and peak voltage below 5.5V.
What is the package of WT2003H4-16S?
It comes in a 16-pin SOP (SOP16) package.
What audio formats are supported?
It supports MP3 and WAV formats with sampling rates from 8kHz to 44.1kHz and bitrates from 8kbps to 320kbps.
What playback modes are available?
Normal, single loop, all loop, random, insert playback, and chained playback.
What are the typical applications?
Voice prompt systems, home appliances, automotive electronics, toys, industrial alarms, and consumer electronics.
Important: SOP16 package operates at 2.6–5.0V. Control via UART with default 9600 baud. For external Flash, Waytronic‑branded Flash is recommended. Power‑up initialization takes 500ms–1s – wait before sending commands. Deep sleep <5µA via B8 command.
