UM1900

Hardware description

DocID027905 Rev 3

7/19

3

Hardware description

The board allows the user to test the function of the STMicroelectronics MEMS

microphones. For this purpose two MP34DT01-M digital MEMS microphone are mounted

on the board and 6 headers (4 mounted with 2 additional footprints) are available for

connecting additional microphones using digital microphone coupon boards (STEVAL-

MKI129Vx or STEVAL-MKI155Vx), for further information refer to www.st.com. The

connection between the X-NUCLEO-CCA02M1 and the STEVAL-MKI155V1 is shown in

Figure 3: "Connection with STEVAL-MKI155V1". The board interfaces with the STM32

Nucleo microcontrollers via the I²S, SPI or DFSDM peripherals for the synchronized

acquisition of up to 4 microphones. The board also provides USB streaming using the

STM32 Nucleo microcontroller USB peripheral; for this purpose, a USB connector is

available as well as the footprint to mount a dedicated oscillator that can be used to feed

the host MCU through the OSC_IN pin. Solder bridges are used in order to choose from

different options, depending on the number of microphones and the MCU peripherals

involved.

Figure 3: Connection with STEVAL-MKI155V1

3.1

Nucleo 144 support

In order to accept Nucleo-144 boards, morpho header connectors must be soldered on the

relevant footprint available on the Nucleo.

A pair of 2 x 38 pin stripline is enough to plug the expansion board, so it is not

necessary to solder the whole 2 x 80 pin header.