Datasheet

242
7593L–AVR–09/12
AT90USB64/128
22.3 Typical application implementation
Depending on the USB operating mode (Device only, Reduced Host or OTG mode) and on the
target application power supply, the Atmel AT90USB64/128 require different hardware typical
implementations.
Figure 22-2. Operating modes versus frequency and power-supply.
22.3.1 Device mode
22.3.1.1 Bus powered device
Figure 22-3. Typical bus powered application with 5V I/O.
VCC (V)
VCC min
0
3.0
3.4
5.5
USB not operational
USB compliant,
without internal regulator
USB compliant,
with internal regulator
4.5
2.7
Maximum
operating frequency [MHz]
8MHz
16MHz
2MHz
3.6
1µF
UDP
UDM
VBUS
UVSS
UID
UCAP
D-
D+
VBUS
UID
UGND
UVCC AVCC VCC
XTAL1 XTAL2 GND GND
Rs = 22
Rs = 22