AT90USBKEY2 Atmel, AT90USBKEY2 Datasheet - Page 7

• 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

2.2.2
2.2.3
AT90USBKey Hardware User Guide
VBUS Generator
“POWER-ON“ LED
When using the AT90USB microcontroller in USB host mode, the AT90USBKey should
provide a 5V power supply over the VBUS pin of its USB mini AB connector.
A couple of transistors allows the UVCON pin of the AT90USB to control the VBUS
generation (See Figure 2-3). In this mode the AT90USBKey is powered by external
battery power supply source.
Figure 2-3 . VBUS generator schematic
The POWER-ON LED (“D1”) is always lit when power is applied to AVRUSBKey
regardless of the power supply source.
UVCON
5V
R25
100k
R24
10k
Q1
BC847B
M1
FDV304P/FAI
-
C19
4.7uF
Using the AT90USBKey
VBUS
7627A–AVR–04/06
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