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.

• A634Products for WTV020 chip module plug the SD card, supports 2.32M ~ 1GBit capacity card;
• Supports the FAT file system, SD card as storage medium;
• And supports playback of WAV format files 4Bit ADCPM;
• Supports automatic speech recognition folders and file playback;
• You can play background music and commercials language;
• Control methods are key control, two-line control and UART232 serial control;
• WTV master chip has WTV020-16SOP and WTV020-20SOP two packages, both of which are compatible;
• You can play any segment of speech;
• Operating voltage: DC2.6 ~ 3.6V;
• Classified by folder store content, easy to operate.
• Supports FAT file system SD carrier
• Supports playing of 4Bit ADCPM format files
• Recognize the voice files automatically
• Support micro-processor and key control
• Could be called any paragraph voice playing
• Saving operation data when power off
• Loading voice to the SD card without assistance of software
• Support combination playing of file (including mute combination)
• Memory contents classified by file

Package Include:

• 1 x WTV020-SD-16P Module

• Model : WTVO20
• Duration : 20 s
• Track : Mono
• Audio Output : DAC/PWM
• Key Board Trigger I/O : 7
• Parallet Address : 7
• Control Modes : Keyboard Prallel(COM+SBT)/ Serial

1. Datasheet - WTV020