AURA SOM/AURA Hardware/Peripherals/Audio

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Issue Date Notes
2023/09/12 First release

Peripheral Audio[edit | edit source]

The Audio interface available on AURA is based on i.MX93 SoC. The audio port supports the following standards and features:

  • Synchronous Audio Interface (SAI)
  • Pulse Density Modulated Microphone Interface (PDM)
  • Sony/Philips digital interface (SPDIF XCVR)
  • Medium Quality Sound (MQS) (MQS is used to generate medium quality audio to connect stereo speakers or headphones to a power amplifier)

Description[edit | edit source]

The Synchronous Audio Interface (SAI) supports 2 Tx lanes and 2 Rx lanes

  • 16-word TX/RX FIFO and up to 32 words per frame
  • One set of Tx clocks and frame sync

The SPDIF (Sony Philips Digital Interface) Transceiver supports raw capture mode that can save all the digital audio bits into audio buffer.

The PDM (Pulse Density Modulated Microphone Interface) module receives audio from a microphone. It includes the following features:

  • Supports up to 8-microphones (4 lanes)
  • Supports frame synchronization

The MQS (Medium Quality Sound) is used to generate medium quality audio via a standard GPIO. It provides only simple audio reproduction. Stereo speakers or headphones can be connected to a power amplifier without an additional DAC chip.

  • 2-channel, LSB-valid 16 bit, MSB shift-out first serial data (sdata)
  • Signals over 10 kHz have worse THD+N values

Pin mapping[edit | edit source]

The Pin mapping is described in the Pinout table section