at90usb647-16au ATMEL Corporation, at90usb647-16au Datasheet - Page 22

• Manufacturer Part Number: at90usb647-16au
• Description: At90usb1286 8-bit Avr Microcontroller With 64/128k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

7. Errata
8. AT90USB1287/6 Errata.
8.1
8.2
22
Second Release
Third Release
First Release
Release
Silicon
AT90USB1287/6
AT90USB1287/6 First Release
AT90USB64/128
Date Code from 0709 to 0801
except lots 0801 7H5103*
Lots 0801 7H5103* and
Note ‘*’ means a blank or any alphanumeric string
8.
7.
6.
Date Code up to 0648
• 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
Date Code from 0814
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
not set the SUSPI bit anymore. The internal USB engine remains in suspend mode but the
USB differential receiver is still enabled and generates a typical 300µA extra-power con-
sumption. Detection of the suspend state after the transient perturbation should be
performed by software (instead of reading the SUSPI bit).
Problem fix/workaround
USB waiver allows bus powered devices to consume up to 2.5mA in suspend state.
USB Eye Diagram violation in low-speed mode
Transient perturbation in USB suspend mode generates overconsumption
VBUS Session valid threshold voltage
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
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
7593GS–AVR–03/08