AT90USBKEY2 Atmel, AT90USBKEY2 Datasheet - Page 6

• Manufacturer Part Number: AT90USBKEY2
• Description: KIT DEMO FOR AT90USB
• Manufacturer: Atmel

Specifications of AT90USBKEY2

• Main Purpose: USB Controller
• Embedded: *
• Utilized Ic / Part: AT90USB1286, AT90USB1287, AT90USB646, AT90USB647
• Primary Attributes: *
• Secondary Attributes: *
• Supplier: Atmel
• Architecture: 8/16-bit
• Interfaces: USB
• For Use With: ATSTK525 - KIT STARTER FOR AT90USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AT90USBKEY; AT90USBKEY

7627A–AVR–04/06
Using the AT90USBKey
2.2
2.2.1
2-6
Power Supply
Power Supply Sources
Battery powered The external battery connector should be used when the AT90USBKey is used as a
USB powered When used as a USB device bus powered application, the AVRUSBKey can be directly
The on-board power supply circuitry allows two power supply configurations:
powered via the USB VBUS power supply line.
USB host. This mode allows the AT90USBKey to provide a 5V power supply from its
VBUS pin.
Figure 2-2 . Power supply schematic
MTA
Ext power supply
J8
from USB connector
from battery connector
– Need of a female battery clip
– Input supply from 8 up to 15V DC (min. 100mA)
2
1
VBUS
D3
LL4148
D4
LL4148
D6
LL4148
5V
U3out=1.25*(1+(R15+R18)/R19)
-
C16
4.7uF
2
7
3
LP3982
IN
SHDN
GND
U4
220nF
C17
FAULT
OUT
OUT
SET
CC
VBAT
1
4
8
6
5
33nF
C15
1
2
LM340
IN
GND
U5
AT90USBKey Hardware User Guide
OUT
R19
124k 1%
100k 1%
100k 1%
3
100nF
C18
R15
R18
VCC3
VCC3