Datasheet

243
7593L–AVR–09/12
AT90USB64/128
Figure 22-4. Typical bus powered application with 3V I/O.
22.3.1.2 Self powered device
Figure 22-5. Typical self powered application with 3.4V to 5.5V I/O.
1µF
UVSS
External
3V regulator
UDP
UDM
VBUS
UVSS
UID
UCAP
D-
D+
VBUS
UID
UGND
UVCC AVCC VCC
XTAL1 XTAL2 GND GND
Rs = 22
Rs = 22
1µF
External 3.4V - 5.5V
power supply
UDP
UDM
VBUS
UVSS
UID
UCAP
D-
D+
VBUS
UID
UGND
UVCC AVCC VCC
XTAL1 XTAL2 GND GND
Rs = 22
Rs = 22