AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 259

• Manufacturer Part Number: AT90USB647-MU
• Description: MCU, 8BIT, 64K FLASH, USB, 64QFN
• Manufacturer: Atmel

Specifications of AT90USB647-MU

• Controller Family/series: AT90
• No. Of I/o's: 48
• Eeprom Memory Size: 2KB
• Ram Memory Size: 4KB
• Cpu Speed: 16MHz
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 64KB
• Oscillator Type: External, Internal
• Package: 64QFN EP
• Device Core: AVR
• Family Name: AT90
• Maximum Speed: 20 MHz
• Ram Size: 4 KB
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 48
• Interface Type: SPI/TWI/USART/USB
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 4
• Lead Free Status / Rohs Status: Details

21.9
21.10 Plug-in detection
7593K–AVR–11/09
OTG timers customizing
It is possible to refine some OTG timers thanks to the OTGTCON register that contains the
PAGE bits to select the timer and the VALUE bits to adjust the value. User should refer to lastest
releases of the OTG specification to select compliant timings.
The USB connection is detected by the VBUS pad, thanks to the following architecture:
• PAGE=00b: AWaitVrise time-out. [OTG]. In Host mode, once VBUSREQ has been set to “1”,
• PAGE=01b: VbBusPulsing. [OTG]. In Device mode, this delay corresponds to the pulse
• PAGE=10b: PdTmOutCnt. [OTG]. In Device mode, when a SRP has been requested to be
• PAGE=11b: SRPDetTmOut. [OTG]. In Host mode, this delay is the minimum pulse duration
if no VBUS is detected on VBUS pin after this AWaitVrise delay then the VBERRI error flag is
set.
duration on Vbus during a SRP.
sent by the firmware, this delay is waited by the hardware after VBUS has gone below the
“session_valid” threshold voltage and before initiating the first pulse. This delay should be
considered as an approximation of USB lines discharge (pull-down resistors vs. line
capacitance) in order to wait that VBUS has gone below the “b_session_end” threshold
voltae, as defined in the OTG specification.
required to detect and accept a valid SRP from a Device.
– VALUE=00bTime-out is set to 20 ms
– VALUE=01bTime-out is set to 50 ms
– VALUE=10bTime-out is set to 70ms
– VALUE=11bTime-out is set to 100 ms
– VALUE=00bTime-out is set to 15 ms
– VALUE=01bTime-out is set to 23 ms
– VALUE=10bTime-out is set to 31 ms
– VALUE=11bTime-out is set to 40 ms
– 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
– 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
AT90USB64/128
259