WT9501M03 is an audio player that supports MP3 audio format, external maximum 32G Byte SD card capacity, supports playback of U disk and SD card audio files, supports button mode and serial control mode, supports direct playback of any segment of audio, supports USB update of SD card contents, and can optionally purchase an internal D-class amplifier (3W×1) output.
The WT9501M03 is a compact voice playback module (41 mm × 39 mm) that can play MP3 files (8‑320 kbps) and WAV files from an SD card (up to 32 GB) or a USB flash drive. It offers two operation modes – a button‑controlled mode and a UART‑controlled mode – and includes an optional 3 W class‑D audio amplifier.
The manual provides product features, pin assignments, electrical parameters, file handling procedures, command formats for playback control, application circuit diagrams for both key and MCU control modes, mechanical dimensions, and a revision history. This manual is written in Chinese.
| Operating voltage | DC5 V |
|---|---|
| Static current | 20 mA |
| Maximum operating current | 70 mA |
| Dimensions | 41 mm × 39 mm |
| Supported SD card capacity | Up to 32 GB |
| MP3 bitrate support | 8 kbps – 320 kbps |
Set the EN pin high to enable operation; set it low to put the module into sleep mode.
Pins 23 to 26 can be used for both USB flash and SD card data lines.