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