ST STM32H7B3I-EVAL - Usb Otg Fs; Description; Operating Voltage; Limitations and Hardware Configuration

Pin
number
Description Pin connection
Pin
number
Description Pin connection
9 MOTOR_DFSDM1_DATIN0 PC1 10 MOTOR_DFSDM1_DATIN2 PC5
11 MOTOR_DFSDM1_CKIN4 PD6 12
MEMS_LED
(1)
/
MOTOR_DFSDM1_CKIN7
PB8
13 MOTOR_DFSDM1_CKIN3 PD8 14 MOTOR_DFSDM1_2_CKIN1 PB13
15 MOTOR_DFSDM1_DATIN4 PE10 16 MOTOR_DFSDM1_CKIN5 PB7
17 MOTOR_DFSDM1_CKIN0 PC0 18 MOTOR_DFSDM1_CKIN2 PC4
19 3V3_AO 3V3_AO 20 GND GND
1. Pins used by MB1299. See the limitations in Section 7.2.3 .
7.3 USB OTG FS
7.3.1 Description
The STM32H7B3I-EVAL Evaluation board supports USB OTG full speed communication via the USB Micro-AB
connector CN27 and the USB power switch U29 connected to V
BUS
. The STM32H7B3I-EVAL Evaluation board
can be powered by this USB connection at 5 V DC with 500 mA current limitation.
A green LED LD11 is lit in one of these cases:
• Power switch (U29) is ON and STM32H7B3I-EVAL works as a USB host
• V
BUS
is powered by another USB host when STM32H7B3I-EVAL works as a USB device.
The red LED LD10 is lit when overcurrent occurs (I
VBUS
superior to 500 mA).
Note: The STM32H7B3I-EVAL board must be powered by an external power supply when using the OTG function.
7.3.2 Operating voltage
The STM32H7B3LIH6QU USB OTG FS interface can only be at 3.3 V on this board.
• In host mode, V
BUS
(5 V) is provided by the U29 power switch.
• In device mode, V
BUS
(5 V) is provided by an external source connected to CN27.
7.3.3 Limitations and hardware configuration
Limitation with secondary function FDCAN1:
• As USB FS DP/DM is shared with FDCAN1 RX/TX, SB36 and SB35 must be removed when using USB
OTG FS in order to avoid any stub.
7.3.4 Interface
Table 29. USB OTG FS Micro-AB connector CN27
Pin number Description Pin number Description
1
VBUS (PA9) (From STMPS2151STR or
to STM32H7B3LIH6QU)
4 ID (PA10)
2 D- (PA11) 5 GND
3 D+ (PA12) - -
7.4 microSD™ card 1
7.4.1 Description
An 8 GByte (Or more) Micro SD card connected to SDIO1 3.0 port of STM32H7B3LIH6QU is available on the
board. The microSD
™
card detection is managed by SD_DETECT1 (PF10).
UM2662
USB OTG FS
UM2662 - Rev 1
page 35/95