AT90USB647 Atmel Corporation, AT90USB647 Datasheet - Page 250

• Manufacturer Part Number: AT90USB647
• Manufacturer: Atmel Corporation

Specifications of AT90USB647

• Flash (kbytes): 64 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 48
• Ext Interrupts: 16
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device + OTG
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• 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: 4
• Output Compare Channels: 10
• Input Capture Channels: 1
• Pwm Channels: 9
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

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