Datasheet

NXP Semiconductors

UM11035

LPCXpresso boards for LPC546xx/LPC540xx/LPC54S0xx families of

MCUs

UM11035

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User manual

Rev. 2.1 — 7th January 2019

28 of 36

Fig 6. Line input circuitry

A second 3.5 mm stereo jack socket (J6) provides a headphone / line out from the codec,

via the circuit shown in Fig 7.

Fig 7. Headphone / line output circuitry

The MCUXpresso SDK includes drivers and example code for the audio codec.

9.3 SD card

The full size SD card (J7) includes in the LPCXpresso546x8/540xx/54S0xx board

provides a 4-bit SDIO interface to support memory cards, plug-in WiFi modules, etc.

Power enable to the socket is provided via PIO2-5, with LED D7 providing a visual

indication when power is applied.

The MCUXpresso SDK includes drivers and examples of using this interface with SD

memory cards.