Internal I/O Ports: 1x 40-pin heade up to 28 x GPIO pins up to 2 x SPI bus up to 2 x I2C bus up to 4 x UART up to 2 x PWM up to 1 x PCM/I2S 2x 5V power pins 2x 3.3V power pins 8x ground pins 1x 2-pin contact pin 1x PWM 1x S/PDIF 1x 15-pin MIPI DSI 1x 15-pin MIPI CSI
