Mediatek Labs LinkIt 2523 HDK User Manual page 17

4.8. Audio

The LinkIt 2523 HDK is equipped with a loud speaker to enable audio playback. To apply this feature on the HDK assign

the GPIO45 as an output to enable the amplifier. LinkIt 2523 HDK also supports full duplex to develop audio receive and

speak at the same time for real‐time development. It's using the I2S interface with master and slave with a sampling rate

of 48Hz and bit width of up to 16bits for stereo.

4.9. Speech

There is one analog microphone on the LinkIt 2523 HDK for audio recording. The audio jack also supports the OMTP

standard for recording. The locations of the microphone and audio jack are shown in Figure 5.

4.10. MSDC

The LinkIt 2523 HDK supports any micro SD card of FAT32 format to read and write data. Micro SD card plug‐in is

detected at GPIO10 with various voltage levels.

The HDK also supports eMMC. eMMC feature is shared with micro SD card by comprehensive pin jumper switching,

please refer to Table 13 for more details.

This document contains information that is proprietary to MediaTek Inc. ("MediaTek") and/or its licensor(s).

Any unauthorized use, reproduction or disclosure of this document in whole or in part is strictly prohibited.

LinkIt 2523 HDK User's Manual

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