I2S Audio Pins

The ESP32-P4-WIFI6-DEV-KIT includes a complete audio subsystem built around the ES8311 codec, connected to the ESP32-P4 via the I2S peripheral.

I2S pin assignments

Signal	GPIO	Direction	Description
MCLK	GPIO13	P4 to codec	Master clock. Drives the ES8311’s internal PLL. Typically 256x the sample rate (e.g., 12.288 MHz for 48 kHz audio).
SCLK	GPIO12	P4 to codec	Serial clock (bit clock). Clocks each audio sample bit on the I2S bus.
LRCK	GPIO10	P4 to codec	Left/right clock (word select). Toggles to indicate left or right channel data. Frequency equals the sample rate.
ASDOUT	GPIO11	P4 to codec	Audio data out from ESP32-P4 to ES8311. Used for playback (speaker, headphone).
DSDIN	GPIO9	Codec to P4	Audio data in from ES8311 to ESP32-P4. Used for recording (microphone input).

Amplifier control

Signal	GPIO	Description
PA_Ctrl	GPIO53	Enable/disable the NS4150B Class D amplifier. Drive HIGH to enable speaker output, LOW to mute.

Note

GPIO53 is also exposed on the 40-pin GPIO header at pin 35. If your application uses the onboard speaker, do not reassign this pin.

Audio signal chain

Playback path

ESP32-P4 (I2S TX)
  -- ASDOUT (GPIO11) -->
  ES8311 codec (DAC)
  -- analog -->
  +-- 3.5 mm headphone jack
  +-- NS4150B amplifier (enabled by PA_Ctrl / GPIO53)
       -- amplified -->
       MX1.25 speaker connector (8 ohm / 2 W)

Capture path

SMD MEMS microphone
  -- analog -->
  ES8311 codec (ADC)
  -- DSDIN (GPIO9) -->
  ESP32-P4 (I2S RX)

ES8311 codec details

Parameter	Value
Chip	ES8311 (Everest Semiconductor)
Interface	I2S (slave mode)
Control bus	I2C (address 0x18, on the default I2C bus: SCL/GPIO8, SDA/GPIO7)
DAC resolution	Up to 24-bit
ADC resolution	Up to 24-bit
Sample rates	8 kHz to 96 kHz
SNR (DAC)	110 dB typical
SNR (ADC)	95 dB typical

Tip

The ES8311 is controlled over I2C for configuration (volume, gain, power modes, etc.) and receives/sends audio data over I2S. Both buses must be initialized in your application. ESP-IDF provides the es8311 component in the esp-bsp package for driver support.

NS4150B amplifier

Parameter	Value
Chip	NS4150B (Nsiway)
Type	Class D, mono, filterless
Output power	3 W at 4 ohm, 2 W at 8 ohm
Enable pin	GPIO53 (active HIGH)
Speaker connector	MX1.25 2P
Recommended speaker	8 ohm, 2 W

The amplifier is always powered but only drives the speaker when PA_Ctrl is HIGH. Set GPIO53 LOW before configuring the I2S peripheral to avoid transient noise on the speaker output during initialization.

I2C control bus (shared)

The ES8311 shares the I2C bus with any external devices connected to:

• 40-pin header pins 3 (SDA/GPIO7) and 5 (SCL/GPIO8)
• The dedicated I2C port connector (component 15)

The ES8311 I2C address is 0x18. Ensure no external device conflicts with this address on the shared bus.

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Pin assignments and codec details sourced from the Waveshare ESP32-P4-WIFI6-DEV-KIT Wiki and ES8311 datasheet.