Usb Type-C ® Fs Port; Touchkey Button; Table 12. Usb Type-C ® Fs Gpio Configuration - ST STM32U083C-DK User Manual

6.12
USB Type-C
The STM32U083C-DK Discovery kit supports USB full-speed (FS) communication. The USB connector (CN14) is
a USB Type-C
500 mA current limitation. The VBUS2 voltage is connected to U17 for V
The STM32U083C-DK Discovery kit supports USB Type-C
®
USB Type-C
Device. Depending on the powering capability of the USB Host, the board can take power from the V
of CN14. In the board schematic diagrams, the corresponding power voltage line is called 5V_USB.
Section 6.4.1 provides information on how to use the powering option.
The PB6 pin is used as V
VDD is 3.3 V, SB24 is ON. When VDD is 1.8 V, SB24 is OFF as the resistor divider value for V
The hardware configuration for the USB FS interface is shown in
GPIO
PA11
PA12
1. The default configuration is shown in bold.
6.13

Touchkey button

The STM32U083C-DK Discovery kit supports a touchkey button based on either RC charging or charge‑transfer
technique. This one is enabled by default.
The touchkey button is connected to one of the TSC ports of STM32U083MC with the related charge capacitor.
An active shield is designed in layer 2 of the main PCB, under the button footprint. It allows the reduction of
disturbances from other circuits to prevent false touch detections.
The active shield is connected to another TSC interface of STM32U083MC through the R56 serial resistor. The
related charge capacitor is connected to the same TSC interface.
The solder bridge and jumper configuration related to the touchkey function enables or disables its operation.
However, most of them serve to optimize the touchkey performance, by isolating copper tracks to avoid
disturbances due to their antenna effect.
For more information about the TSC interface and the tuning explanation for this interface, refer to the application
note Getting started with touch sensing control on STM32 microcontrollers (AN5105) and the STM32U0xx product
datasheets.
UM3292 - Rev 1
®
FS port
®
connector. The USB connector (CN14) can power the Discovery board at a 5 V DC voltage with a
connector (CN14) of the STM32U083C-DK Discovery kit is detected, it starts behaving as a USB
sensing detection when the USB Device is bus-powered or self-powered. When
BUS
Table 12. USB Type-C
Hardware Setting
OFF
SB8
ON
OFF
SB7
ON
®
sink only. When a USB Host connection to the
Table 12.
®
FS GPIO configuration
(1)
PA11 is used as the USB_FS_N diff pair interface.
PA11 is connected in parallel to the extension connector (CN10).
The USB interface can be disturbed.
PA12 is used as the USB_FS_P diff pair interface.
PA12 is connected in parallel to the extension connector (CN10).
The USB interface can be disturbed.
Hardware layout and configuration
overvoltage protection.
BUS
detection.
BUS
Configuration
UM3292
terminal
BUS
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