Hardware layout and configuration UM2411
20/61 UM2411 Rev 2
U5V, the user must pay attention that the power source delivers a sufficient amount of
current for the complete STM32H747I-DISCO board setup.
When a USB host connection to the CN1 Micro-AB USB connector of STM32H747I-DISCO
is detected, the STM32H747I-DISCO board starts behaving as a USB device. Depending
on the powering capability of the USB host, the board can take power from the VBUS
terminal of CN1. In the board schematics, the corresponding power voltage line is called
HS.
Refer to Section 5.2: Power supply on page 14 for the related jumper setting.
5.6.2 STM32H747I-DISCO as USB host
When a USB device connection to the CN1 Micro-AB USB connector is detected, the
STM32H747I-DISCO board starts behaving as USB host. It sources 5
V on the VBUS
terminal of CN1 Micro-AB USB connector to power the USB device. For this to happen, the
STM32H747XIH6 MCU sets the U2 power switch STMPS2151STR to the ON state via
USB3320C. The LD7 green LED marked OTG_HS indicates that the peripheral is supplied
by the board. The LD5 red LED marked HS_OC lights up if over-current is detected.
5.7 Ethernet
The STM32H747I-DISCO board supports 10Mbps/100Mbps Ethernet communication with
the U18 LAN8742A-CZ-TR PHY from MICROCHIP and CN7 integrated RJ45 connector.
The Ethernet PHY is connected to the STM32H747XIH6 MCU via the RMII interface.
The 25 MHz clock for the PHY is generated by oscillator X2. The 50 MHz clock for the
STM32H747XIH6 is provided by the RMII_REF_CLK of the PHY.
5.8 SDRAM
The U7 8M x 32bit SDRAM (IS42S32800G-6BLI) is connected to SDRAM Bank1 of
STM32H747XIH6 FMC interface.
5.9 Quad-SPI Flash memory
Two 512-Mbit Quad-SPI Flash memory devices (MX25QL512ABB8ESF-0SIT from
MACRONIX) are fitted on STM32H747I-DISCO in positions U3 and U14, making possible
the evaluation of the STM32H747XIH6 Quad-SPI interface.
5.10 Virtual COM port
The serial interface USART1 is directly available as a Virtual COM port of a PC connected
to STLINK-V3E USB connector CN2. The Virtual COM port configuration is:
• 115200 b/s
• 8-bit data
• no parity
• 1 stop bit
To Next Page
Loading...
Need help?
General
