LPC5536
FC0
FC6
FC2
FC3
FC4
Audio codec
Audio jacks
I2S master
I2S slave
I2S master/slave
I2S slave
I2S slave
I2S slave
I2S master/slave
Audio
expansion
connector
Figure 8. I2S diagram
The table below shows the LPC55S36-EVK I2S bus device map.
Table 15. I2S bus device map
Device
I2S master
I2S slaves
Audio codec (U13)
FC0
FC3
Audio expansion connector (J44)
FC0/FC3
• When FC0 is used as I2S master; FC2, FC3,
FC4, and FC6 are I2S slaves
• When FC3 is used as I2S master; FC0, FC2,
FC4, and FC6 are I2S slaves
2.6.1 Audio codec and audio expansion connector
The LPC55S36-EVK board has an audio coder/decoder (codec) for encoding/decoding audio data. The audio codec is connected
to two audio jacks, one for receiving input for audio codec and other for sending output from audio codec.
The board also provides an audio expansion connector, which can be used to connect an external audio device. The routing
of signals between the target MCU and audio codec (or audio expansion connector) is controlled through various configuration
resistors. The configuration resistors of the audio codec are populated, allowing it to communicate to the target MCU. The
configuration resistors of the audio expansion connector are not populated on the board.
Communication between audio codec / audio expansion connector and the target MCU is enabled using I2C bus (for control
signals) and I2S bus (for data signals).
The audio codec, audio jacks, and audio expansion connector are described in the table below.
NXP Semiconductors
LPC55S36-EVK Functional Description
LPC55S36-EVK Board User Manual, Rev. 1, 24 January 2022
User Manual
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