![ST UM2033 Скачать руководство пользователя страница 20](http://html1.mh-extra.com/html/st/um2033/um2033_user-manual_1355577020.webp)
Hardware layout and configuration
UM2033
20/44
UM2033 Rev 4
•
Two external speakers can be connected to the codec device via the JP2 for the left
speaker and JP3 for the right speaker.
•
Four digital microphones (ST MEMS microphone) are available on the
32F769IDISCOVERY Discovery board. They are connected to the input digital
microphones of the STM32F769NIH6 and are managed by the DFSDM functionality.
•
One coaxial connector (CN12) is implemented on the 32F769IDISCOVERY to receive
external audio data compatible with SPDIF specifications.
•
One coaxial connector (CN8) is implemented on the 32F769IDISCOVERY to output
external audio data compatible with SPDIF specifications.
5.9
USB OTG HS
32F769IDISCOVERY Discovery board supports USB OTG high-speed communication via a
USB Micro-AB connector and a USB high-speed PHY for high-speed function.
The Discovery board can be powered by USB connectors at 5 V DC with a 500 mA current
limitation.
A USB power switch is also connected to V
BUS
and provides power to CN15. The green
LED LD5 is lit in one of these cases:
•
Power switch is ON and 32F769IDISCOVERY works as a USB host
•
VBUS is powered by another USB host when 32F769IDISCOVERY works as a USB
device
The red LED LD4 is lit when an overcurrent occurs.
Note:
32F769IDISCOVERY Discovery board should be powered by an external power supply
when using the OTG function.
5.10 microSD™
card
The 2-Gbyte (or more) microSD™ card connected to the SDMMC2 port of STM32F769NIH6
is supported by the board.
5.11 Ethernet
The 32F769IDISCOVERY Discovery board supports 10/100-Mbit Ethernet communication
by a PHY and integrates an RJ45 connector. Ethernet PHY is connected to the
STM32F769NIH6 via an RMII interface.
The oscillator X2 generates a 25 MHz clock for the PHY, the PHY RMII_REF_CLK
generates the 50 MHz clock for the STM32F769NIH6.
5.12 Power
over
Ethernet
The 32F769IDISCOVERY Discovery board integrates a power module that uses Ethernet.
This module is an IEEE802.3af compliant, class 1 / 2 PoE converter based on the simple
diode rectified Flyback topology around the PM8800A component from ST. This module
''Powered Device'' accepts an input voltage of 48 V and can provide 5 V with 600 mA.