Datasheet

258
ATmega16U4/32U4 [DATASHEET]
Atmel-7766J-USB-ATmega16U4/32U4-Datasheet_04/2016
Figure 21-4. Typical Bus Powered Application with 3V I/O
21.3.2 Self Powered Device
Figure 21-5. 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