Product characteristics:

1. Support MP3 and WAV decoding formats.
2. Supported sampling rate (kHz): 8/11.025/12/16/22.05/24/32/44.1/48. 3. 24 bit DAC output, 90dB in dynamic range and 85dB in signal-to-noise ratio.
4. Fully support FAT16/FAT32 file system.
5. Equipped with 5W class D power amplifier, it can directly drive 4 Ω, 3~5w horn.
6. UART serial adapter controls voice broadcast function, which can control playback, pause, music selection, volume increase and decrease and other functions. The maximum music selection is 65535 tracks, and the baud rate is 9600 bit/s.
7. It supports the IO trigger playback function. 8 tracks are triggered by 8 IO ports alone or 255 tracks are triggered by 8 IO ports in combination.
8. Support for One_ Line single bus serial adapter port control, which can control playback, pause, music selection, volume increase and decrease and other functions.
9. It supports 3 configured IOS to select up to 7 working modes and set the dial switch. The operation is simple.

Pin description:

5V power supply negative pole: connected to 5V power supply negative pole (GND)
5V power supply positive pole: connected to 5V power supply positive pole
Txd/IO0: input pin IO0 in io trigger mode; TX pin in UART control mode, connected to RX of control terminal (MCU)
Rxd/IO1: input pin IO1 in io trigger mode; RX pin in UART control mode, connected to TX of control terminal (MCU)
IO2:IO trigger mode input pin IO2
IO3:IO trigger mode input pin IO3
IO4/One_ Line:io trigger mode input pin IO4; One_ Line line serial port control mode data receiving pin
IO5:IO trigger mode input pin IO5
IO6:IO trigger mode input pin IO6
IO7:IO trigger mode input pin IO7
Busy: output low level (0V) when playing a track, and output high level (3.3V) after playing
GND: reference ground terminal (connected with control terminal GND)