AT90USB647-AU Atmel, AT90USB647-AU Datasheet - Page 25

• Manufacturer Part Number: AT90USB647-AU
• Description: MCU, 8BIT, AVR, 64K FLASH, USB, 64TQFP
• Manufacturer: Atmel

Specifications of AT90USB647-AU

• No. Of I/o's: 48
• Eeprom Memory Size: 2KB
• Ram Memory Size: 4KB
• Cpu Speed: 20MHz
• No. Of Timers: 4
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 64KB
• Oscillator Type: External, Internal
• Controller Family/series: AVR USB
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Details

7. Errata
8. AT90USB1287/6 Errata.
8.1
8.2
7593KS–AVR–11/09
Second Release
Third Release
First Release
Release
Silicon
AT90USB1287/6
AT90USB1287/6 First Release
Date Code from 0709 to 0801
except lots 0801 7H5103*
Lots 0801 7H5103* and
Note ‘*’ means a blank or any alphanumeric string
9.
8.
7.
Date Code up to 0648
Date Code from 0814
• Incorrect CPU behavior for VBUSTI and IDTI interrupts routines
• USB Eye Diagram violation in low-speed mode
• Transient perturbation in USB suspend mode generates over consumption
• VBUS Session valid threshold voltage
• USB signal rate
• VBUS residual level
• Spike on TWI pins when TWI is enabled
• High current consumption in sleep mode
• Async timer interrupt wake up from sleep generate multiple interrupts
90USB1286-16MU
The CPU core may incorrectly execute the interrupt vector related to the VBUSTI and IDTI
interrupt flags.
Problem fix/workaround
Do not enable these interrupts, firmware must process these USB events by polling VBUSTI
and IDTI flags.
The low to high transition of D- violates the USB eye diagram specification when transmitting
with low-speed signaling.
Problem fix/workaround
None.
In device mode and when the USB is suspended, transient perturbation received on the
USB lines generates a wake up state. However the idle state following the perturbation does
Incorrect CPU behavior for VBUSTI and IDTI interrupts routines
USB Eye Diagram violation in low-speed mode
Transient perturbation in USB suspend mode generates overconsumption
Errata History
from Date Code 0722 to 0806
except lots 0735 6H2726*
and lots 0735 6H2726*
Date Code up to 0714
Date Code from 0814
90USB1287-16AU
AT90USB64/128
Date Code from 0714 to 0810
except lots 0748 7H5103*
Lots 0748 7H5103* and
Date Code up to 0701
Date Code from 0814
90USB1287-16MU
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