The WTV020 module (HCMODU0072) is based on the WTV020SD-20 device and allows for direct playback of audio files stored on a microSD card. The module also has outputs that will either drive an 8ohm speaker connected to the SPK+ and SPK- pins, or drive a single ended amplifier directly from its DAC output via the AUDIO-L pin. There are also several options for controlling playback including interfacing push buttons for play/pause, track forward/backwards and volume up/down. Alternatively the module can be controlled via a two wire serial interface (clock and data) that allows for random track selection and playback control.

Please note: The digital pins are not 5V tolerant. If interfacing to a 5V microcontroller, the datasheet recommends using 470R resistors between the microcontroller and this module. Alternatively a level shifter or potential divider can be used. MP3 format files will need to be converted to AD4 format for playback.