AVR32768
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.
VDD
3.3 volt
regulator
USB_VBOF
VBUS
DM
VBUS
D-
39 ꢀ
39 ꢀ
DP
D+
USB_ID
ID
GND
Table 9-1. USB bus-powered connection checklist.
Signal name Recommended pin connection
Description
USB_VBOF
VBUS
Can be left unconnected
Directly to connector
39ꢀ series resistor
USB power control pin
USB power pin
DM
Negative differential data line
Placed as close as possible to DM
pin
39ꢀ series resistor
DP
Positive differential data line
Placed as close as possible to DP
pin
USB_ID
Can be used as GPIO if not used
USB connector identification pin
13
32157A-AVR-12/10
ATMEL [ ATMEL ]
