atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 422

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

35. Errata
35.1
422
AT90USB164/324 Rev A
ATmega32U4
The revision letter in this section refers to the revision of the ATmega32U4 device.
1. Spike on TWI pins when TWI is enabled
2. High current consumption in sleep mode
100 ns negative spike occurs on SDA and SCL pins when TWI is enabled.
Problem Fix/work around
No known work around, enable ATmega32U4 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/work around
Before entering sleep, interrupts not used to wake up the part from the sleep mode should
be disabled.
7766A–AVR–03/08