AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 250

• Manufacturer Part Number: AT90USB647-MU
• Description: MCU, 8BIT, 64K FLASH, USB, 64QFN
• Manufacturer: Atmel

Specifications of AT90USB647-MU

• Controller Family/series: AT90
• No. Of I/o's: 48
• Eeprom Memory Size: 2KB
• Ram Memory Size: 4KB
• Cpu Speed: 16MHz
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 64KB
• Oscillator Type: External, Internal
• Package: 64QFN EP
• Device Core: AVR
• Family Name: AT90
• Maximum Speed: 20 MHz
• Ram Size: 4 KB
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 48
• Interface Type: SPI/TWI/USART/USB
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 4
• Lead Free Status / Rohs Status: Details

21.3.3
250
AT90USB64/128
Design guidelines
Figure 21-8. Host/OTG application with 5V I/O
• Serial resistors on USB Data lines must have 22 Ohms value (
• Traces from the input USB receptable (or from the cable connection in the case of a tethered
• Voltage transcient / ESD suppressors may also be used to prevent USB pads to be damaged
• U
• A 10µF capacitor is highly recommended on VBUS line
device) to the USB microcontroller pads should be as short as possibles, and follow
differential traces routing rules (same length, as near as possible, avoid vias accumulation).
by external disturbances.
cap
capacitor should be 1µF (
VBUS
UVSS
UDP
UDM
UID
5V
Rs=22
Rs=22
+/-
1µF
10%) for correct operation.
UVCON
UCAP
VBUS
UGND
D+
D-
UID
UVCC
XTAL1
XTAL2
AVCC
GND
VCC
+/-
GND
5%).
External 5.0V
Power Supply
7593K–AVR–11/09