ATMEGA8U2-MU Atmel, ATMEGA8U2-MU Datasheet - Page 189
ATMEGA8U2-MU
Manufacturer Part Number
ATMEGA8U2-MU
Description
MCU AVR 8K FLASH USB 32-VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8U2-MU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
Processor Series
ATMEGA8x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
SPI, UART
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
22
Number Of Timers
2
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, AT90USBKEY, ATEVK525
Minimum Operating Temperature
- 40 C
Package
32QFN EP
Device Core
AVR
Family Name
ATmega
Maximum Speed
16 MHz
Operating Supply Voltage
3.3|5 V
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
Details
- Current page: 189 of 309
- Download datasheet (6Mb)
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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