AT32UC3C1512C Automotive Atmel Corporation, AT32UC3C1512C Automotive Datasheet - Page 876

• Manufacturer Part Number: AT32UC3C1512C Automotive
• Manufacturer: Atmel Corporation

32.6.1.9
9166C–AVR-08/11
ID detection
Figure 32-6. Plug-in Detection Input Block Diagram
The control logic of the USB_VBUS pad outputs two signals:
In device mode, the USBSTA.VBUS bit follows the Session_valid comparator output:
In host mode, the USBSTA.VBUS bit follows a hysteresis based on Session_valid and
Va_Vbus_valid:
The VBUS Transition Interrupt (VBUSTI) bit in USBSTA is set on each transition of the USB-
STA.VBUS bit.
The USBSTA.VBUS bit is operational regardless of whether the USBC is enabled or not.
Figure 32-7
Figure 32-7. ID Detection Input Block Diagram
• The Session_valid signal is high when the voltage on the USB_VBUS pad is higher than or
• The Va_Vbus_valid signal is high when the voltage on the USB_VBUS pad is higher than or
• It is set when the voltage on the USB_VBUS pad is higher than or equal to 1.4V.
• It is cleared when the voltage on the VBUS pad is lower than 1.4V.
• It is set when the voltage on the USB_VBUS pad is higher than or equal to 4.4V.
• It is cleared when the voltage on the USB_VBUS pad is lower than 1.4V.
equal to 1.4V.
equal to 4.4V.
USB_VBUS
USB_ID
shows how the ID transitions are detected.
I/O Controller
Pad Logic
VDD
GND
VDD
Session_valid
Va_Vbus_valid
VBUS_pulsing
VBUS_discharge
UIMOD
USBCON
USBCON
1
0
UIDE
Logic
USBSTA
ID
USBSTA
VBUS
AT32UC3C
USBSTA
IDTI
VBUSTI
876