ADCREF0 datasheet(13/30 Pages) ATMEL

Part #	ADCREF0

Description	32-Bit AVR UC3 C Series Schematic Checklist

PDF	30 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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13 / 30 page

AVR32768

32157A-AVR-12/10

9 USB connection

9.1 Not used

When the USB interface is not used, DM, DP and VBUS should be connected to

ground.

9.2 Device mode, bus-powered connection

Figure 9-1.

USB in device mode, bus-powered connection example schematic.

USB_VBOF

VBUS

USB_ID

VBUS

D-

D+

GND

3.3 volt

regulator

VDD

39 Ω

Table 9-1.

USB bus-powered connection checklist.

Signal name

Recommended pin connection

Description

USB_VBOF

Can be left unconnected

USB power control pin

VBUS

Directly to connector

USB power pin

39Ω series resistor

Placed as close as possible to DM

Negative differential data line

39Ω series resistor

Placed as close as possible to DP

Positive differential data line

USB_ID

Can be used as GPIO if not used

USB connector identification pin

ADCREF0 Datasheet(PDF) 13 Page - ATMEL Corporation