Configuration Elements Related To The Usb Otg Fs Port; Table 11. Configuration Elements Related To The Usb Otg Fs Port - ST STM32L476ZG User Manual

Hardware layout and configuration
6.8.3

Configuration elements related to the USB OTG FS port

The following STM32L476ZG terminals related to the USB OTG FS port control are shared
by other resources of the STM32L476G-EVAL board:
•
PB12 used as USB overcurrent input (USBOTG_OVRCR signal). It is shared with
SWP, touch sensing, LCD glass module, and motor control resources
•
PB13 used as USB power ready input (USBOTG_PRDY signal); it is shared with NFC,
touch sensing and LCD glass module resources
•
PC6 used as USB power switch control (USBOTG_PPWR signal); it is shared with
touch sensing, LCD glass module, and motor control
Configuration elements related to the USB OTG FS port, such as jumpers, solder bridges,
and zero-ohm resistors, shunt the shared ports toward different resources or determine the
operating mode of the USB OTG FS port. By default, they are set such as to enable the
USB OTG FS port operation where STM32L476G-EVAL plays a USB Device role and can
be connected to a USB Host.
related to the USB OTG FS port. The LCD glass module daughterboard must be connected
in the I/O position.
USBOTG_OVRCR and USBOTG_PRDY signals, requiring the PB12 and PB13 ports of
STM32L476ZG, are only exploited when STM32L476G-EVAL acts as a USB Host. That is
why, the USB Host function of STM32L476G-EVAL is exclusive to alternate functions also
requiring PB12 and PB13 ports of STM32L476ZG - NFC, touch sensing, motor control,
SWP.
The PB12 and PB13 ports of STM32L476ZG are not required for the USB OTG FS port to
operate as a USB Device.
Element
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R36
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Table 11

Table 11. Configuration elements related to the USB OTG FS port

Setting
USB OTG FS port can be connected to a USB Host and get power
Open from it. If connected to the USB Device, STM32L476G-EVAL cannot
supply power to it.
Default setting.
Closed USB OTG FS port can be connected to a USB Device and supply
power to it. It must not be connected to the USB Host.
Default setting
PC6 is shunted to control the U1 power switch, transiting through the
In LCD glass module daughterboard connector.
LCD glass module daughterboard must be in I/O position, with SB2
and SB27 open.
PC6 is disconnected from the LCD glass module daughterboard
Out connector. It can be shunted to one of the alternate resources, either
touch sensing (SB2 closed) or motor control (SB27 closed).
gives an overview of all configuration elements
Description
UM1855 Rev 6
UM1855