AT90USBKEY Atmel, AT90USBKEY Datasheet - Page 7

• Manufacturer Part Number: AT90USBKEY
• Description: MCU, MPU & DSP Development Tools Demo board f/AVR MCU & AT90USB
• Manufacturer: Atmel

Specifications of AT90USBKEY

• Processor To Be Evaluated: AT90USB AVR
• Data Bus Width: 8 bit
• Interface Type: USB
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: AVRUSB
• Silicon Core Number: AT90USB
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AT90USBKEY2

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
2-7