AT90USB82/162
Problem Fix/workaround
Before entering sleep, interrupts not used to wake up the part from the sleep mode should
be disabled.
2. 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.
33. Datasheet Revision History for AT90USB82/162
Please note that the referring page numbers in this section are referred to this document. The
referring revision in this section are referring to the document revision.
33.1 Changes from 7707A to 7707B
1. Removed all references to Timer/Counter 2, A/D Converter.
2. Clarified information in Power Reduction Mode and Timer/Counter 1 sections.
3. Added USB design guidelines and schematics.
4. Updated default fuse configuration & EEPROM page size.
5. Updated AC/DC parameters.
6. Updated Errata section.
33.2 Changes from 7707B to 7707C
1. Updated Errata section.
33.3 Changes from 7707C to 7707D
1. Correction to Oscillator description, page 245.
299
7707DS–AVR–07/08
ATMEL [ ATMEL ]
