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ATmega32U2 Datasheet(PDF) 186 Page - ATMEL Corporation

Part # ATmega32U2
Description  8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller
PDF  314 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega32U2 Datasheet(HTML) 186 Page - ATMEL Corporation

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186
7799B–AVR–07/09
ATmega8U2/16U2/32U2
20.3
USB Module Powering Options
Depending on the selected target application power supply (V
CC), the ATmega8U2/16U2/32U2
USB controller requires different powering schemes, see Figure 20-2 on page 186.
Figure 20-2. Operating modes versus frequency and power-supply
20.3.1
Bus Powered device
The folowing figures show typical iomplementations for different powering schemes.
Figure 20-3. Typical Bus powered application with 5V I/O
VCC (V)
VCC min
0
3.0
4.0
5.5
USB not operational
USB compliant,
without internal regulator
USB compliant,
with internal regulator
4.5
2.7
Max
Operating Frequency (MHz)
8 MHz
16 MHz
2 MHz
3.6
1µF
UDM
UDP
VBUS
UVSS
UCAP
D-
D+
UVCC
VCC
UVSS
VSS
XTAL1
XTAL2



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