Free shipping high quality WM8731 module TLV320AIC23 audio 8731 WIFI voice raspberry pie sound card | Инструменты

Processing chip WM8731 The following are the basic parameters of the chip

After the controller, such as the microcontroller ARM FPGA.... after initialization       Can play music or voice with headphones or stereo           You can superimpose the music and the voice of the speech to form a karaoke effect! ! ! !   First, the sending information contains 1. One WM8731 audio circuit board.   2, WM8731 data manual, customer development and use.   3, WM8731 board schematic, for customer reference.   4, WM8731 initialization configuration project, written by verilog language. Mainly IIC configuration can be used to close the register. For details, please refer to the data sheet.   Second, the module function   1. The module can realize the external input LINE, MIC and DAC amplification and filtering, and can select the output through the analog signal.     2. External input LINE, MIC digital signal output after DAC, output mode can be IIS mode or DSP mode.            The sampling rate is 8KHZ – 96KHZ.   Sample bit width 16bit, 20bit, 24bit, 32bit   Second, the interface definition: Power supply interface: As shown in Figure 4 above, the power supply voltage is 3.3V, pay attention to the positive and negative poles, and the silk screen on the board is marked.   Data interface: The position of Figure 5 above, mainly digital audio input and output interface and IIC interface.   If only the external audio input is implemented, then the chip outputs the audio after processing, and only the IIC interface and the power interface can be connected.   If you want to save external audio or have an existing audio DA or AD conversion you need to connect other pins.   Audio input:   Mode 1, the position 3.5 audio interface of Figure 1 above, can be connected to a computer, MP3 and other linear audio output devices.   Mode 2, position 3.5 audio interface in Figure 2, can be connected to common passive microphones, such as computer microphones, headsets, etc.   After the relevant registers are also configured, the implementation mode 1 and mode 2 can select the output or select the input DAC.   Audio output: Position 3.5 audio interface in Figure 3, you can connect headphones, computer speakers, headsets, etc.   Typical output Connects a 16 ohm or 32 ohm headset.   Description:   If you need to use the module's ADC or DAC function, you need to provide a clock source externally or solder the crystal at the board crystal position.   Because the usage mode is different from the controller, the system needs different clocks. Most processors also have their own clock output, which can be directly connected to the MCLK pin. Therefore, there is no solder crystal. There is only a crystal interface.   Module 2.5 pitch pin The default is up, please contact the battery if you have special needs!         Common working modes are normal mode and USB mode. Normal mode selects the appropriate input clock according to the sampling rate (see manual page 38), USB mode fixed input 12MHZ clock, internal setting register clock through register.