WTN6040FP-14S High-Power Voice Chip
40‑Second Voice IC with Integrated Class‑D Amplifier, 3W Output, and Low EMI
The WTN6040FP-14S is a high-power voice chip developed by Waytronic, featuring a built-in Class-D audio power amplifier that directly drives a 4Ω speaker with up to 3W @ 5V. It operates without an LC filter, significantly reducing EMI interference across the full bandwidth. With 40 seconds of voice storage, 12-bit PWM output, and 16-level volume control, it is ideal for applications requiring loud, clear audio in a compact footprint.
- 3W @ 5V into 4Ω speaker – built-in Class-D amp
- No LC filter – excellent EMI suppression
- Flash-based – update voice via downloader
- 1-wire / 2-wire / key control modes
- Protections – short‑circuit, over‑current, over‑temperature
Key Features
Technical Specifications
| Parameter | Value / Condition |
|---|---|
| Operating Voltage (VCC) | 2.0V – 5.5V (recommended ≥3.0V for amp) |
| Power Amplifier Voltage (VPD) | 3.0V – 5.5V (5V for full 3W output) |
| Standby Current | < 10 µA |
| Operating Current (no load) | ~7 mA |
| Output Power (4Ω @ 5V) | Up to 3W |
| Output Power (8Ω @ 5V) | Up to 2W (adjustable via gain resistors) |
| Audio Output | 12-bit PWM (Differential outputs OUT‑N / OUT‑P) |
| Sampling Rate Support | 6 kHz – 32 kHz |
| Volume Control | 16 levels (E0H min – EFH max) |
| Voice Storage | 40 seconds |
| Address Segments | 224 (00H – DFH) |
| Amplifier Efficiency | 88% (Class-D) |
| Startup Time (with COM cap) | ~61 ms (typ.) |
| Operating Temperature | ‑25°C ~ +85°C (functional to ‑40°C) |
| Internal Oscillator | 13.1072 MHz (±3%) |
| I/O Pull-down | 1 MΩ (internal) |
Control Interfaces
Application Scenarios
Why Choose WTN6040FP-14S
Output Power Configuration Reference
| Output Power | Speaker | VCC / VPD | Gain Setting Resistors (R1/R11) | COM Cap (C13) |
|---|---|---|---|---|
| 3W | 4Ω 3W | 5V / 5V | 200K / 1K | 0.01µF |
| 2W | 4Ω 2W | 5V / 5V | 200K / 1K | Not fitted (use 3.9K resistor) |
| 1W | 4Ω 1W | 5V / 5V | 300K / 6.8K | 0.01µF |
| 2W | 8Ω 2W | 5V / 5V | 100K / 1K | Not fitted (use 3.3K resistor) |
| 1W | 8Ω 1W | 5V / 5V | 200K / 1K | Not fitted (use 3.9K resistor) |
| 3W | 4Ω 3W | 3.3V / 5V | 150K / 1K | 0.01µF |
Gain formula: Avd = 230K / Rin, where Rin = R1+R11 (or R3+R12). See datasheet for full details.
Frequently Asked Questions
What is the maximum output power of WTN6040FP-14S?
WTN6040FP-14S can deliver up to 3W into a 4Ω speaker at 5V supply, thanks to the built-in Class-D amplifier.
Does WTN6040FP-14S require an LC filter on the output?
No. The WTN6040FP-14S chip has excellent EMI suppression across the full bandwidth and can operate without an LC filter, reducing BOM cost and board space.
What control interfaces are supported?
WTN6040FP-14S supports 1-wire serial, 2-wire serial, and key (button) control modes. The control mode is fixed during programming and must be specified when ordering.
What is the operating voltage range?
The IO and audio circuitry (VCC) operates from 2.0V to 5.5V, while the internal power amplifier (VPD) requires 3.0V to 5.5V. For full 3W output, a 5V supply on VPD is recommended.
How long can the voice storage be?
The WTN6040FP-14S provides 40 seconds of voice storage at standard sampling rates.
What protections are integrated?
It includes short-circuit protection, over-current protection, and over-temperature protection to ensure reliable operation.
Can I update the voice content in the field?
Yes. The WTN6040FP-14S chip is Flash-based and supports online voice replacement using a dedicated downloader. Both the main program and voice data can be reprogrammed.
What is the typical startup time of the built-in amplifier?
With a 0.1µF capacitor on the COM pin (pin 3), the startup time is approximately 61ms at 5V. Without the capacitor, it is about 43ms, but the capacitor is recommended for better noise immunity.
How many voice addresses can be used?
WTN6040FP-14S supports up to 224 address segments (00H to DFH). Each address corresponds to a voice segment.
What is the PA2 pin behavior?
PA2 is the BUSY output pin. It is normally low and goes high during voice playback. Do not add pull-up or pull-down resistors to PA2 to avoid improper operation.
Important: The control mode and output type (PWM) are fixed during programming – specify when ordering. For DAC or other configurations, refer to other WTN6 models. Do not add pull resistors to PA2. For high‑power designs, follow the recommended PCB layout guidelines (Y‑shaped power routing, separate ground, and keep capacitor close to VCC/VPD pins).
