WT2003HX Series Recording Chip
1‑Wire / 2‑Wire Serial Control with High‑Quality Recording & Playback
The WT2003HX Series-R are versatile recording and playback voice chips supporting 1‑wire and 2‑wire serial control. They feature high‑quality recording with sampling rates up to 24kHz, a built‑in 0.5W Class‑D amplifier with 8‑level volume control, and support for external Flash expansion up to 128Mbit. With ultra‑low standby current (<5µA) and availability in SOP16, TSSOP24, and QFN32 packages, these chips are ideal for a wide range of voice recording applications.
- 1‑wire / 2‑wire serial – flexible control options
- High‑quality recording – 8–24kHz sampling rates
- Built‑in 0.5W amplifier – 8‑level volume control
- External Flash – up to 128Mbit expansion
- Ultra‑low power – < 5µA standby current
WT2003HX Series-R Key Features
Recording Duration Reference
| Chip Type | Storage | Sample Rate | Duration (±30s) |
|---|---|---|---|
| WT2003H4K | Built-in 350KB | 8K | ~77s |
| 12K | ~51s | ||
| 16K | ~40s | ||
| 24K | ~26s | ||
| WT2003Hp8-32N | Built-in 800KB | 8K | ~176s |
| 12K | ~117s | ||
| 16K | ~87s | ||
| 24K | ~58s | ||
| WT2003H0+WT25Q128B | External 128Mbit | 8K | ~3564s |
| 12K | ~2376s | ||
| 16K | ~1782s | ||
| 24K | ~1188s |
Duration is approximate (±30s). Default recording sample rate is 24kHz. External Flash sizes: 8Mbit, 16Mbit, 32Mbit, 64Mbit, and 128Mbit available.
Key Commands (1‑Wire / 2‑Wire)
| Command | Function | Description |
|---|---|---|
| F0 | Auto Sleep | After playback ends, chip enters sleep after 5 seconds (power-on default) |
| F3 + Address | Chain Playback | Play multiple addresses in sequence |
| F4 00 / F4 01 | Output Mode Switch | F4 00 → DAC output, F4 01 → PWM output |
| F4 02 | Deep Sleep | Enter deep sleep mode |
| F5 | Start Recording | Begin recording (single segment, auto-stored) |
| F6 | Play Recording | Play back the recorded segment |
| FE | Stop | Stop playback or recording |
| 00H–DFH | Play Address | Play the corresponding voice address segment |
| E0H–EFH | Volume Control | E0 = min volume, EF = max volume (16 levels) |
Technical Specifications
| Parameter | Value / Condition |
|---|---|
| Operating Voltage | 2.4V – 5.2V |
| Standby Current | < 5 µA (deep sleep) |
| Recording Sampling Rates | 8K, 12K, 16K, 20K, 24K |
| Playback Bitrates | 8 kbps – 320 kbps |
| Audio Output | PWM (default) / DAC (switchable) |
| Built‑in Amplifier | 0.5W Class‑D, 8‑level volume |
| External Flash | Up to 128 Mbit (SPI‑Flash) |
| Control Interfaces | 1‑wire, 2‑wire (UART/key customizable) |
| Busy Indicator | High during recording/playback, low when idle |
| Power‑up Init Time | 200–300 ms |
| Operating Temperature | ‑40°C ~ +85°C |
| Packages | SOP16, TSSOP24, QFN32 |
Pin Assignment – Control & Audio
| Package | DATA1 Pin | BUSY Pin |
|---|---|---|
| SOP16 | 6 | 15 |
| TSSOP24 | 9 | 20 |
| QFN32 | 2 | 12 |
Key pins: DATA1 = 1‑wire data input / 2‑wire clock. DATA2 (QFN32 pin15) = 2‑wire data input. BUSY = high during playback/recording. MIC = microphone input. DAC = analog audio output.
Application Scenarios
Why Choose WT2003HX Series-R
Frequently Asked Questions
What control interfaces does the WT2003HX Series-R support?
WT2003HX Series-R supports 1-wire serial and 2-wire serial control. UART and key control are also available as customizable options.
What is the recording quality and duration?
Recording supports sampling rates of 8K, 12K, 16K, 20K, and 24K. Duration varies by chip model and Flash size: built-in storage offers up to 58 seconds at 24K, while external Flash (128Mbit) can provide up to 1188 seconds at 24K.
Does the chip have a built-in amplifier?
Yes. WT2003HX Series-R features a built-in 0.5W Class-D amplifier with 8-level adjustable volume, capable of directly driving an 8Ω speaker.
What is the standby current consumption?
The WT2003HX Series-R chip enters deep sleep mode 5 seconds after power-on, with standby current less than 5µA. The first command sent after wake-up is ineffective and serves only as a wake-up trigger.
What is the operating voltage range?
The WT2003HX Series-R chip operates from 2.4V to 5.2V, making it compatible with both 3.3V and 5V systems.
Can external Flash be added for extended storage?
Yes. The WT2003HX Series-R chip supports external Flash expansion up to 128Mbit. It is recommended to use Waytronic-branded Flash memory for guaranteed compatibility.
What packages are available?
The WT2003HX Series-R is available in SOP16, TSSOP24, and QFN32 packages, suitable for various application requirements.
What audio output modes are supported?
By default, PWM output is used. DAC output can be enabled by connecting the DAC pin and sending the F4 00 command. External amplifier output is also supported.
How do I start and stop recording?
Send the F5 command to start recording and FE to stop recording. The chip records a single segment per session and automatically stores it. Use the F6 command to play back the recording.
What are the typical applications?
Voice recorders, interactive toys, security systems, industrial alarms, home appliances, voice prompts, and any application requiring voice recording and playback with low power consumption.
Important: The chip’s recording circuit is powered by the internal LDO (3.3V), consuming 30–450µA. For ultra‑low power (<5µA), alternative power supply through other IO ports is available (custom engineering, contact sales). The chip is set to PWM output by default – send F4 00 to switch to DAC. For external Flash, Waytronic‑branded Flash is recommended. Reserve a UART port on the PCB for program and voice updates.
