This document is a user manual for the WTV020-SD module produced by Guangzhou Weichuang Electronics Co., Ltd. It describes the features and characteristics of the product, including support for up to 1G capacity SD cards, playback of 4Bit ADPCM format files, and automatic recognition of voice files.
The WTV020‑SD series are voice modules that support an external SD card up to 1 GB and can play AD4 and WAV audio files. They provide multiple control modes such as MP3 mode, key‑to‑key (3‑ or 5‑segment) mode, power‑on loop playback, and two‑wire serial control, with DAC and PWM audio outputs.
The document includes product features, pin descriptions, module selection, detailed control‑mode timing diagrams, typical application circuits, package dimensions, and supply information, as well as version history and sales contacts. This manual is written in Chinese.
| Maximum SD card capacity | 1 GB |
|---|---|
| AD4 sampling rate range | 6 kHz‑32 kHz, 36 kHz |
| WAV sampling rate range | 6 kHz‑16 kHz |
| Audio output | 16‑bit DAC and PWM |
| Maximum voice segments | 512 |
| Operating voltage | DC 2.5 V – 3.6 V |
| Static current (no SD) | 16 µA |
The module supports an external SD card up to 1 GB in size.
Up to 512 voice segments can be stored.
AD4 files can be sampled at 6 kHz to 32 kHz, and also at 36 kHz.
The module operates from 2.5 V to 3.6 V DC.