AT90USB1286-16MU ATMEL [ATMEL Corporation], AT90USB1286-16MU Datasheet - Page 261

• Manufacturer Part Number: AT90USB1286-16MU
• Description: Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
• Manufacturer: ATMEL [ATMEL Corporation]

21.11 Plug-in detection
7593A–AVR–02/06
The USB connection is detected by the VBUS pad, thanks to the following architecture:
Figure 21-16. Plug-in Detection Input Block Diagram
The control logic of the UVBUS pad outputs 2 signals:
In the Host mode, the VBUS flag follows the next hysteresis rule:
In the Peripheral mode, the VBUS flag follows the next rule:
The VBUSTI interrupt is triggered at each transition of the VBUS flag.
• VALUE=01bTime-out is set to 23 ms
• VALUE=10bTime-out is set to 31 ms
• VALUE=11bTime-out is set to 40 ms
• PAGE=10b: PdTmOutCnt. [OTG] chapter 5.3.2
• VALUE=00bTime-out is set to 93 ms
• VALUE=01bTime-out is set to 105 ms
• VALUE=10bTime-out is set to 118 ms
• VALUE=11bTime-out is set to 131 ms
• PAGE=11b: SRPDetTmOut. [OTG] chapter 5.3.3
• VALUE=00bTime-out is set to 10 us
• VALUE=01bTime-out is set to 100 us
• VALUE=10bTime-out is set to 1 ms
• VALUE=11bTime-out is set to 11 ms
• The “session_valid” signal is active high when the voltage on the UVBUS pad is higher or
• The “Va_Vbus_valid” signal is active high when the voltage on the UVBUS pad is higher or
• VBUS is set when the voltage on the UVBUS pad is higher or equal to 4.4 V.
• VBUS is cleared when the voltage on the UVBUS pad is lower than 1.4 V.
• VBUS is set when the voltage on the UVBUS pad is higher or equal to 1.4 V.
• VBUS is cleared when the voltage on the UVBUS pad is lower than 1.4 V.
equal to 1.4V.
equal to 4.4V.
UVBUS
Pad logic
VDD
VSS
Session_valid
Va_Vbus_valid
VBus_pulsing
VBus_discharge
Logic
USBSTA.0
VBUS
AT90USB64/128
VBUSTI
USBINT.0
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