STEVAL-MKI138V1

STEVAL-MKI138V1 STAudioHub USB interface board based on MP34DT01 and STM32 Data brief Description Top view 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. Bottom view 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. Features • Powered and connected to PC through USB • Sound card automatically recognized by the PC as an audio device. • MEMS microphones provide a high frequency data stream (1 to 3.25 MHz) of 1 bit digital samples (PDM technique) • Audio collected from the microphones is sent to the PC through USB • LED status indicator • RoHS compliant June 2013 DocID024359 Rev 2 1/4 www.st.com 4 Application block diagram 1 STEVAL-MKI138V1 Application block diagram Figure 1. Microphone USB demonstration board block diagram 2/4 DocID024359 Rev 2 STEVAL-MKI138V1 2 Revision history Revision history Table 1. Document revision history Date Revision Changes 01-Mar-2013 1 Initial release. 20-Jun-2013 2 Title has been modified. 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