ATSTK525 Atmel, ATSTK525 Datasheet - Page 11

• Manufacturer Part Number: ATSTK525
• Description: KIT STARTER FOR AT90USB
• Manufacturer: Atmel

Specifications of ATSTK525

• Accessory Type: STK500 Expansion Module
• Processor To Be Evaluated: AT90USBxxx
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Silicon Core Number: AT90USB
• Kit Contents: Board Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT90USB Devices
• For Use With: ATEVK525 - ADD ON KIT FOR STK525ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.3.3
2.4
2.4.1
2.4.2
2.5
2.5.1
STK525 Hardware User Guide
STK500 RESET
AT90USBxxx AVR Microcontroller
Main Clock XTAL
Analog Power Supply
Serial Links
USB
ANA REF By default, AREF is an output of AT90USBxxx.
AVCC By default, AVCC is equivalent to VCC.
(c.f.
To use the USB interface of the AT90USBxxx, the clock source should always be a
crystal or external clock oscillator (the internal 8MHz RC oscillator cannot be used to
operate with the USB interface). Only the following crystal frequency allows proper USB
operations: 2MHz, 4MHz, 6MHz, 8MHz, 12MHz, 16MHz. The STK525 comes with a
default 8MHz crystal oscillator.
When closing STKX1 and STKX2 switches, and STK525 is connected to an STK500,
the STK525 can operate with the “STK500 Osc” frequency parameter.
An external AREF source can be chosen (c.f.
The STK525 is supplied with a standard USB mini A-B receptacle. The mini AB
receptacle allows to connect both a mini A plug or a mini B plug connectors.
Figure 2-7 . USB mini A-B Receptacle
When connected to a mini B plug, the AT90USBxxx operates as an “USB device” (the
ID pin of the plug is unconnected) and when connected to a mini A plug, the
AT90USBxxx operates as a “USB host” (the ID pin of the plug is tied to ground).
“RESET from STK500” on page 20
)
“STK500 Resources” on page 19
Using the STK525
7608A–AVR–04/06
).
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