ST STM32H747I-DISCO User Manual

UM2411 Rev 2 19/61
UM2411 Hardware layout and configuration
60
The audio connections are:
• The analog line input is connected to the ADC of the WM8994ECS/R through blue
audio jack CN10
• The analog line output is connected to the DAC of the WM8994ECS/R via green audio
jack CN11
• Two external speakers can be connected to WM8994ECS/R via JP5 for the right
speaker and JP2 for the left speaker
• One MP34DT05-A digital microphone is present on the STM32H747I-DISCO board
The I²C-bus addresses of the WM8994 codec are 34h and 35h.
5.5.1 Digital microphone
The U21 on the STM32H747I-DISCO board is STMicroelectronics MP34DT05-A MEMS
digital omnidirectional microphone providing PDM (pulse density modulation) output. The
microphone is supplied with a programmable clock generated directly by the
STM32H747XIH6 or the codec.
As an option, the microphone can be connected to U12 (Wolfson WM8994 audio codec
device). In that configuration, WM8994 also supplies the PDM clock to the microphone.
Regardless of microphone routing (STM32H747XIH6 MCU or WM8994 codec), the power
can be supplied either by VDD or the MICBIAS1 output of the WM8994 codec device.
Table 4 shows the settings of all solder bridges associated to the digital microphone on the
board.
5.6 USB OTG HS port
The STM32H747I-DISCO supports USB OTG HS (high-speed) communication via the U4
USB PHY USB3320C-EZK with the ULPI interface. USB OTG connector CN1 is of the
Micro-AB type.
5.6.1 STM32H747I-DISCO as USB device
The STM32H747I-DISCO board may work as USB device on CN1 in any power source
configuration. If the board is supplied by an external power source from jumper JP4 set on
Table 4. Digital microphone-related jumper settings
Solder bridge Setting Configuration
SB45, SB21,
SB44, SB22
SB45, SB21 open,
SB44, SB22 closed
The PDM clock for the digital microphone is provided by
the WM8994 codec.
SB45, SB21 closed,
SB44, SB22 open
Default setting.
The PDM clock for the digital microphone is provided by
the STM32H747XIH6 MCU.
SB42, SB41
SB41 closed,
SB42 open
The power supply of the digital microphone is generated
by the WM8994 codec.
SB41 open,
SB42 closed
Default setting.
The power supply of the digital microphone is +3V3.

ST STM32H747I-DISCO Specifications

General

Brand	ST
Model	STM32H747I-DISCO
Category	Motherboard
Language	English