SPI interface, the control signal lines are led out A headphone and stereo output Onboard Microphone for recording A line-in input interface Separate 3.5 mm Jack for MIC and Speaker Onboard Power Indicator 3.3V and 2.8V of LDO chip AMS-1117 on board provides up to 800mA current
Using serial Nor flash external expansion memory chip W25Q128. Operating Voltage: 2.7-3.6V Support the SPI interface. Capacity: 128M-bit / 16M-byte Clock Frequency: ?? 104MHz
Supply Voltage ?? Min: 2.7 V Supply Voltage ?? Max: 3.6 V Interface Type: SPI Maximum Clock Frequency: 133 MHz Organization: 4 M x 8 Data Bus Width: 8 bit Timing Type: Synchronous Minimum Operating Temperature: ?? 40 C Maximum Operating Temperature: + 85 C