Raspberry Pi Pinout
GPIO 21 (PCM Data-Out)
| Alt0 | Alt1 | Alt2 | Alt3 | Alt4 | Alt5 |
|---|---|---|---|---|---|
| PCM DOUT | SMI SD13 | DPI D17 | I2CSL CE | SPI1 SCLK | GPCLK1 |
- Physical/Board pin 40
- GPIO/BCM pin 21
- Wiring Pi pin 29
GPIO 21 is used by PCM to provide a data output signal to an external audio device such as a DAC chip.
