Raspberry Pi Pinout

GPIO 20 (PCM Data-In)

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PCM DINSMI SD12DPI D16I2CSL MISOSPI1 MOSIGPCLK0
  • Physical/Board pin 38
  • GPIO/BCM pin 20
  • Wiring Pi pin 28

GPIO 20 is used by PCM to as a data input from an audio device such as an I2C microphone.