The purpose of STEVAL-MKI138V1 is to provide a demonstration of decoding and streaming of digital MEMS microphone outputs.
The STEVAL-MKI138V1 demonstration board hosts the MP34DT01 (top-port digital microphone), working as a sensor and the STM32F107RC microcontroller, which functions as an audio decoder.
These microphones are analog-to-digital transducers. They are capable of sensing sound pressure and converting it to a digital signal using the PDM technique.
The STM32 microcontroller decodes the PDM signals from the microphones and streams the audio via USB.
The STEVAL-MKI138V1 is a sound card automatically recognized by the PC as an audio device. Connection is made through a USB cable, which both powers the board and streams the audio collected from the microphones to the PC.
It is also possible to use the STEVAL-MKI138V1 as an interface board for other microphone boards (STEVAL-MKI126Vx), in which case use of the APWorkbench software tool is recommended.
|DB1918: STAudioHub USB interface board based on MP34DT01 and STM32||2.0||245 KB|
|AN4227: Audio hub demonstration kit supporting the M45DT02, MP34DB01, and MP34DT01 microphones||1.0||1 MB|
|AN4184: Microphone coupon boards STEVAL-MKI129Vx /MKI155Vx based on digital microphones||2.0||1 MB|
|AN4146: STSmartVoice demonstration board STEVAL-MKI126Vx||2.0||3 MB|
|STEVAL-MKI138V1 gerber files||1.0||240 KB|
|STEVAL-MKI138V1 BOM||2.0||82 KB|
|STEVAL-MKI138V1 schematics||1.0||1 MB|
|Evaluation products license agreement||1.4||128 KB|
|Part Number||Marketing Status||Unit Price (US$) *||Quantity||Core Product||ECCN (EU)||ECCN (US)||Country of Origin||More info||Order from ST||Order from Distributors|
|STEVAL-MKI138V1||NRND : Not Recommended for New Design. Product is in volume production only to support customers ongoing production.||72||1||STM32F107; MP34DT01||NEC||EAR99||-||MORE INFO||DISTRIBUTOR AVAILABILITY|
|Part Number||Marketing Status||Package||Grade||RoHS Compliance Grade||Material Declaration**|
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.