AT90USB1286-16MU ATMEL [ATMEL Corporation], AT90USB1286-16MU Datasheet - Page 425

• Manufacturer Part Number: AT90USB1286-16MU
• Description: Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
• Manufacturer: ATMEL [ATMEL Corporation]

35. Errata
35.1
7593A–AVR–02/06
Rev A
The revision letter in this section refers to the revision of the AT90USB64/128 device.
4.
3. Spike on TWI pins when TWI is enabled
2. High current consumption in sleep mode
1. Asynchonous timer interrupt wake up from sleep generates multiple interrupts
• 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
In USB device and host mode, once a 5V level has been detected to the VBUS pad, a resid-
ual level (about 3V) can be measured on the VBUS pin.
Problem fix/workaround
None.
100 ns negative spike occurs on SDA and SCL pins when TWI is enabled.
Problem Fix/workaround
No known workaround, enable AT90USB64/128 TWI first versus the others nodes of the
TWI network.
If a pending interrupt cannot wake the part up from the selected mode, the current consump-
tion will increase during sleep when executing the SLEEP instruction directly after a SEI
instruction.
Problem Fix/workaround
Before entering sleep, interrupts not used to wake up the part from the sleep mode should
be disabled.
If the cpu core is in sleep and wakeups from an asynchronous timer interrupt and then go
back in sleep again it may wake up multiple times.
Problem Fix/workaround
A s o f t w a r e w o r k a r o u n d i s t o w a i t w i t h p e r f o r m i n g t h e s l e e p i n s t r u c t i o n u n t i l
TCNT2>OCR2+1.
VBUS residual level
AT90USB64/128
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