22

7593GS–AVR–03/08

AT90USB64/128

7.

Errata

8.

AT90USB1287/6 Errata.

8.1

Note ‘*’ means a blank or any alphanumeric string

8.2

AT90USB1287/6 First Release

• 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

8.

USB Eye Diagram violation in low-speed mode

The low to high transition of D- violates the USB eye diagram specification when transmitting

with low-speed signaling.

Problem fix/workaround

None.

7.

Transient perturbation in USB suspend mode generates overconsumption

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.

6.

VBUS Session valid threshold voltage

Silicon

Release

90USB1286-16MU

90USB1287-16AU

90USB1287-16MU

First Release

Date Code up to 0648

Date Code up to 0714

and lots 0735 6H2726*

Date Code up to 0701

Second Release

Date Code from 0709 to 0801

except lots 0801 7H5103*

from Date Code 0722 to 0806

except lots 0735 6H2726*

Date Code from 0714 to 0810

except lots 0748 7H5103*

Third Release

Lots 0801 7H5103* and

Date Code from 0814

Date Code from 0814

Lots 0748 7H5103* and

Date Code from 0814