PH2.0-7P:BT_LED,WIFI_LED,GPIO2,GPIO1,ADC_KEY, GND,VCC_3V3 (top to bottom)
GPIO2 and GPIO1 is used to connect a coding key, should be used for volume control. KEY is a ADC key port, reference the
diagram below for key definitions. BT_LED, WIFI_LED are used to extend the LED, and are common-anode connected. You
should connect 3.3V to a current limit resister and then to LED
and then to the pin. (reference the diagram below)
PH2.0-7P: SPDIF, MCLK, IIS_DATA, BCLK, LRCK, GND, VCC_3V3:
This is the digital audio output extension. For the IIS, BCLK is 2.8MHz, the LRCK is 44.1KHz, the MCLK is 11.288MHz, the
DOUT following the standard IIS data format and have 16 bits depth. The system is running in master mode, you should
make sure the IIS port of connected device is running in slave mode.
PH2.0-4P: ROUT, GND, LOUT, GND: For analog output to amplifier board, it has same signal with the 3.5mm Aux jack
Connection Diagram
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