ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 189
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ATmega32U2
Manufacturer Part Number
ATmega32U2
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32U2
Flash (kbytes)
32 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
22
Ext Interrupts
20
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
5
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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20.3.3
20.4
20.4.1
20.4.2
7799D–AVR–11/10
General Operating Modes
Design guidelines
Introduction
Power-on and reset
The following design guidelines should be met:
In addition it is highly recommended to connect a 10µF capacitor to the VBUS line
The USB controller is disabled and reset after a hardware reset generated by:
In the case of USB End Of Reset (EOR), the USB controller is reset, but not disabled. Therefore
the device remains attached.
Figure 20-7 on page 189
Figure 20-7. USB controller states after reset
• Serial resistors on USB Data lines must have 22 Ohms value (
• Traces from the input USB receptacle (or from the cable connection in the case of a tethered
• Voltage transient / ESD suppressors may also be used to prevent USB pads to be damaged
• U
device) to the USB microcontroller pads should be as short as possible, and follow differential
traces routing rules (same length, as near as possible and avoid vias accumulation).
by external disturbances.
cap
– Power on reset
– External reset
– Watchdog reset
– Brown out reset
– debugWIRE reset
– USB End Of Reset
capacitor should be 1µF (
Clock stopped
FRZCLK = 1
(macro off)
USBE = 1
Device
illustrates the USB controller main states on power-on:
+/-
10%) for correct operation.
USBE = 0
Reset
HW RESET
(from EOR)
ATmega8U2/16U2/32U2
USBE = 0
USBE = 0
+/-
(except from EOR)
Any other
5%).
HW RESET
state
189
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