Congratulation for acquiring the A VR® STK525 Starter Kit. This ki t is designed to give
designers a quick start to develop code on the AT90USBxxx and for prototyping and
testing of new designs.
This document describes the STK525 dedicated to the AT90USBxxx AVR
microcontroller. This board is des ig ned to al low an eas y ev alu ation of t he product using
demonstration software.
To complement the evaluation and enable additional development capability, the
STK525 can be plu gged into the Atmel STK500 Start er Kit Board in order to use the
AT90USBxxx with advanced features such as variable VCC, variable VRef, variable
XTAL, etc. and supports all AVR development tools.
To increase its demonstrative capabilities, this stand alone board has numerous onboard resources (USB, RS232, joystick, data-flash, microphone and temperature
sensor).
This user guide acts as a general getting started guide as well as a comple te technical
reference for advanced users.
STK525 Hardware User Guide1-3
7608A–AVR–04/06
Introduction
Figure 1-1 . STK525 Board
1.2STK525 Starter Kit Feature s
The STK525 provides the following features:
AT90USBxxx TQFP device (2.7V<Vcc<5.5V),
AVR Studio® software interface
USB software interface for Device Firmware Upgrade (DFU bootloader)
STK500 compatible
Power supply flagged by “VCC-ON” LED:
– regulated 3 or 5V,
– from an external power connector,
– from the USB interface (USB device bus powered application),
– from STK5 0 0
ISP connector for on-chip ISP,
JT AG connector:
– for on-chip ISP,
– for on-chip debugging using JTAG ICE,
Serial interfaces:
– 1 USB full/low speed device/host interface
– RS-232C ports with RTS/CTS handshake lines,
On-board resources:
– 4+1-ways joystick,
–4 LEDs,
– temperature sensor,
– microphone,
– serial dataflash memory,
(2)
(1)
,
(2)
,
1-4STK525 Hardware User Guide
7608A–AVR–04/06
Introduction
On-board RESET button,
On-board HWB button for force bootloader section execution at reset.
Notes: 1. The STK525 is suppor ted by A VR S tudi o®, ver sion 4.12SP2 or higher . For up-to-date
information on this and other AVR tool products, please consult our web site. The
newest version of AVR Studio®, AVR tools and this User Guide can be found in the
AVR section of the Atmel web site, http://www.atmel.com.
2. ATMEL Flip®, In System Programming Version 3 or Higher shall be used for Device
Firmware Upgrade . Please consult Atmel web site to retrieve the latest version of Flip
and the DFU bootloader Hex file if needed.
STK525 Hardware User Guide1-5
7608A–AVR–04/06
2.1Overview
Section 2
Using the STK525
This chapter describes the board and all its features.
Figure 2-1 . STK525 Overview
USB MiniABRS232JTAGISPExternal Power
C Sensor
Pin1
STK500 Expand0
TQFP64 Socket
LEDS
Microphone
Vbus Gen.
Setting
JoystickPotentiometerResetCrystal
Vcc Src.
Setting
Data Flash
STK500 Expand1
Bootloader
Activation
STK525 Hardware User Guide2-6
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2.2Power Supply
2.2.1Power Supply Sources
Using the STK525
The on-board power supply circuitry allows various power supply configurations.
The power supply source can come from three different
USB connector,
JACK PWR connector (J6, See Figure 2-2),
STK500
USB powered: When used as a USB devi ce bus powered application, the STK525 can be powered via
the USB VBUS power supply line.
JACK PWR connector:– Need of a male JACK outlet,
– Input supply from 9 up to 15V
– No specific polarization
(2)
is required.
Figure 2-2 . JACK PWR Connector (J6)
(1)
DC,
(3)
and exclusive sources:
Figure 2-3 . M ale JACK Outlet and Wires
+
-
STK500 Powered: (c.f.
STK525 Hardware User Guide2-7
“STK500 Resour ces” on page 19).
Notes: 1. 15V is the maxim um level limitation of an unidirectional transit diode.
2. There is a diode (bridge) voltage level between the negative output of the power
supply and the STK525 “GND”. This could introduce some gap of voltage during
measurement and instrumentation.
3. Caution: Do not mount more than one power supply sour ce on STK525.
7608A–AVR–04/06
Using the STK525
2.2.2Pow er S upp l y Sett in g
Vcc Source
Jumper position
VBUS 5
REG 55V
Table 2-1 . Power Supply
VCC power
supply value
This is the default confi guration.
This should be used for a typical USB
VBUS
(4,7V to 5. 0V)
device “bus powered” application.
In this mod e, the STK525 is powered
directly from th e USB bus, and no
other external power supply is
required.
This configuration can be used for a
USB “self powered” device
application” or when operating has a
USB host.
To use this conf iguration an exter nal
power supply must be connected to
J6 connector.
(1)
Setting
CommentsView
Source
Reg 5
Reg 3.3
VBUS 5
STK
Source
Reg 5
Reg 3.3
VBUS 5
STK
VCC
VCC
REG 3.33.3V
Depends on
STK
STK500 VTG
setting
Notes: 1. Caution: The STK500 has its own “ON/OFF” switch
This configuration allows the STK525
to be used in a 3V range applicat ion.
This configuration can be used with
both device or host mode USB
applications.
To use this conf iguration an exter nal
power supply must be connected to
J6 connector.
This configuration allows the STK525
to be used with an STK500 board.
In this mode, the STK525 power
supply is generat ed and configured
accord i ng to th e “VT G ” par ameter of
the STK500 (1).
VCC
Source
Reg 5
Reg 3.3
VBUS 5
STK
VCC
Source
Reg 5
Reg 3.3
VBUS 5
STK
2-8STK525 Hardware User Guide
7608A–AVR–04/06
2.2.3VBUS Generator Setting
Using the STK525
When using the A T90USBxxx microcontroller in USB ho st mode. The STK5 25 should
provide a 5V power supply over the VBUS pin of its USB mini AB connector.
A couple of transistors on the STK525 allows the UVCON pin of the AT90USBxxx to
control the VBUS gene ration (See Figure 2 -4). In this mode the S TK525 is powe red by
external power supply source (J6 or STK500 expand0/1 connectors). JP7 allows to
select the 5V source used by the VBUS generator.
Figure 2-4 . VBUS generator schematic
JP7
VTG
STK
Ext
UVCON
1
3
VBUS ge n
R33
100k
2
R32
10k
Q2
BC847B
FDV304P/FAI
M1
VBUS
C34
4.7uF
-
Table 2-2 . VBUS Generator Setting
“Vbus Gen”
Jumper position
“Ext”Ext e rnal po w er su pp ly from J6
“Stk”
STK525 power supplyCommentsView
Exte r n a l po w er su pp ly from
Expand0/1 (connected to a STK500)
This is the default configuration.
The VBUS generator source is the
on-board 5V regulator.
The VBUS generator source is the
STK500.
Note:
The “Vtarget” setting of STK500
should be set to “5V”.
Ext
Ext
Vbus
Gen
Stk
Vbus
Gen
Stk
STK525 Hardware User Guide2-9
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Using the STK525
2.2.4“POWER-ON“ LED
2.3RESET
The POWER-ON LED is always lit when power is applied to STK525 regardless of
power supply source and the regulation.
Figure 2-5 . “VCC-ON” LED
Although the AT90USBxxx has its on-chip RESET circuitry (c.f. AT90USBxxx
Datasheet, section “System Control and Reset), the STK525 provides the AT90USBxxx
a RESET signal which can come from 3 different sources:
2.3.1Power-on RESET
2.3.2RESET Push Button
The on-board RC network acts as power-on RESET.
By pressing the RESET push button on the STK525, a warm RESET of the
AT90USBxxx is performed.
To use the USB i nterface of the AT90USBxxx, the clock source should always be a
crystal or external clock oscillator (the internal 8 MHz 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 ST KX1 and STKX2 s witches, and STK525 is connected to an STK500,
the STK525 can operate with the “STK500 Osc” frequency parameter.
2.4.2Anal og P ower Supply
Using the STK525
ANA REF By default, AREF is an output of AT90USBxxx.
2.5Serial Links
2.5.1USB
AVCC By default, AVCC is equivalent to VCC.
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
“STK500 Resour ces” on page 19).
When connected to a m ini B plug, the AT90USBxxx opera tes 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).
STK525 Hardware User Guide2-11
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Using the STK525
2.5.2RS-232C
The AT90USBxxx is a microcontroller with an on-chip USART peripheral (USART1).
Only the asynchronous mode is supported by the STK525.
The STK525 is supplied with a RS-232 driver/receiver. One female DB9 connector
assumes the RS-232 connections.
Figure 2-8 . RS -232 DB9 Connector
Figure 2-9 . RS -232 DB9 Connections
RS-232 D B 9 fron t view
5
1
234
69
78
Figure 2-10 . Typical PC Connection Layout
STK525 / RS-232 DB9
FunctionPin NoFunction
RTS (
AT90USBxxx
Pin No
2TxD (AT90USBxxx)
5GND
If Hardware Data Flow Control
7CTS (AT90USBxxx)7
)
pin 2
RS-TxD
pin 3RS-RxD
pin 4
pin 6
pin 5GND
pin 7RS-CTS
pin 8RS-RTS
PC / DB9 serial port
(COM1 o r C OM x )
2
3
RxD (PC)
TxD (PC)3RxD (AT90USBxx x)
5GND
RTS (PC)
8
CTS (PC)8
2-12STK525 Hardware User Guide
7608A–AVR–04/06
Using the STK525
The STK525 USART implement ation allows an optional hardware flow control that can
be enabled thanks to SP4, SP5, SP7, SP8 solder pads (See Figure 2-11).
Note:1. Tx reference: STK525 source, Rx reference: STK525 destinati on
Solder Pads
Configuration
SP4: open
SP5: open
SP7: open
SP8: open
SP4: close
SP5: close
SP7: close
SP8: close
DB9
Connection
TxRxPin 2
Pin 3
Tx
Pin 2
Rx
Pin 3
CTS
Pin 7
Pin 8
RTS
(1)
STK525 Hardware User Guide2-13
7608A–AVR–04/06
Using the STK525
2.6On-board Resources
2.6.1Joystick
The 4+1 way joystick offers an easy user interface implementation for a USB application
(it can emulate mouse movements, keyboard inputs, etc.).
Pushing a push-button causes the corresponding signal to be pulled low, while releasing
(not pressed) causes an H.Z stat e on the s igna l. The user m us t enable i nternal pul l-ups
on the input pins, removing the need for an external pull-up resistors on the push-button.
Figure 2-12 . Joystick Schemati c
SW3
SW3
SW3
1
1
1
2
2
2
TPA511G
TPA511G
TPA511G
Com1
Com1
Com1
Com2
Com2
Com2
Select
Select
Select
Left
Left
Left
Up
Up
Up
Right
Right
Right
Down
Down
Down
PB[7..0]
PB[7..0]
PB[7..0]
PB5
PB5
PB5
5
5
5
PB6
PB6
PB6
7
7
7
PB7
PB7
PB7
3
3
3
PE4
PE4
PE4
6
6
6
PE5
PE5
PE5
4
4
4
PE[7..0]
PE[7..0]
PE[7..0]
2.6.2LEDs
Figure 2-13 . Joystick Implementation
The STK525 include s 4 green LEDs implemented on one line. They are connected to
the high nibble of “Port D” of AT90USBxxx (PORTD[4..7]).
To light On a LED, the correspo nding port pin must drive to high level. To light Off a
LED, the corresponding port pin must drive a low level. It is the opposite method used in
STK500.
2-14STK525 Hardware User Guide
7608A–AVR–04/06
Figure 2-14 . LEDs Implementation Schematic
In-line Grouped LED s
Using the STK525
R121k
R131k
R141k
R151k
LED 0 (green)
LED 1 (green)
LED 2 (green)
LED 3 (green)
PD4
D2TOPLED LP M676
PD5
D3TOPLED LP M676
PD6
D4TOPLED LP M676
PD7
D5TOPLED LP M676
PD[7..0]
STK525 Hardware User Guide2-15
7608A–AVR–04/06
Using the STK525
2.6.3Temperature Sensor
The temperature sensor uses a thermistor (R18), or temperature-sensitive resistor. This
thermistor has a ne gative temperature c oefficient (NTC), mea ning the resistance goes
up as temperature goes down. Of all passive temperature measurement sensors,
thermistors have the highest sensitivity (resistance cha nge per degree of temperat ure
change). Thermistors do not have a linear temperature/resistance curve.
The voltage over the NTC can be found using the A/D converter (connected to channel
0). See the AT90USBxxx datasheet for how to use the ADC. The thermistor value (R
T)
is calculated with the following expression:
R
RHV
T
Where:RT = Thermistor value (Ω) at T temperature (°Kelvin)
⋅()VCC V
ADC0
H = Second resistor of the bridge -100 KΩ ±10% at 25°C
R
ADC0 = Volt age value on ADC-0 input (V)
V
VCC = Board power supply
–
()⁄=
ADC0
The NTC thermistor used in STK525 has a resistance of 100 KΩ ±5% at 25° C (T0) and a
beta-value of 4250 ±3%. By the use of the following equation, the temperature (T) can
be calculated:
T
Where:RT = Thermistor value (Ω) at T temperature (°Kelvin)
R
T
⎛⎞
ln
⎝⎠
-------
R
------+
T
0
β
0
β
-------------------------------=
ß = 4250 ±3%
0 = 100 KΩ ±5% at 25°C
R
T
0 = 298 °K (273 °K + 25 °K)
The following cross table also can be used. It is based on the above equation.
Table 2-4 . Thermistor Values versus Temperature
The STK525 provides an electret microph one associated with its required preamplifier
(See Figure 2-16), the interface is connected to ADC channel 2 of the AT90USBxxx
microcontroller.
STK525 Hardware User Guide2-17
7608A–AVR–04/06
Using the STK525
Figure 2-16 . Microphone interface schematic
3.3V
R20
2.2k
MIC1
MICROPHONE
2.6.5Data Flash Memory
R23 100k
3.3V
R24 100k
-
6
+
5
84
U4B
LMV358
7
R27 0
C24 4.7uF
+
R21
100k
R25 10k
R28
100k
+
1uF
C25
2
3
3.3V
C22220pF
U4A
LMV358
-
1
+
84
R22
100k
R26 22k
For mass-storage class demonstration purposes, the STK525 provides an on-chip serial
Flash memory (AT45DB321x) connected to the AT90USBxxx Serial Port Interface
(SPI).
TP4
1
Mic
2.6.6Potentiometer
The data-flash chip select signal is connected to PortB bit 4 of the AT90USBxxx (See
Figure 2-17).
Figure 2-17 . On-board data flash schematic
PB[7..0]
3.3V
R10
100k
PB4
PB1
PB2
PB3
R11
100k
RESET
U2
1
BUSY
2
RESET
3
WP
11
CS
12
SCK
13
SI
14
SO
AT45DB321C TSOP28
VCC
GND
3.3V
6
C15
7
100nF
The cursor of a potentiometer is connected to ADC channel 1 of the AT90USBxxx.
2-18STK525 Hardware User Guide
7608A–AVR–04/06
2.7STK500 Resources
Using the STK525
Figure 2-18 . Connecting STK525 to the STK500 Board
Note:Caution: Do not mount an AVR microcontroller on the STK500 board when STK525 is
plugged on STK500.
2.7.1Supply Voltage from STK500
The AVR supply voltage coming from STK500 (VT G) can also be controlled from AVR
Studio®.
The supply voltage coming from STK500 is controlled by power supply circuitry of
the STK525. Refer to
Table 2-1 on page 8 to configure “Vcc Source” jumper.
2.7.2Analog Reference Voltage from STK50 0
The AVR Analog Reference V oltage com ing from ST K500 (RE F) can also be cont rolled
from AVR Studio®.
JP3 should be closed
STK525 Hardware User Guide2-19
7608A–AVR–04/06
Using the STK525
2.7.3EXP.CON 0 & EXP.CON 1 Connectors
Figure 2-19 . EXP.CON 0 and EXP.CON 1 Connectors
2.7.4Main Clock from STK500
The AVR clock frequency (external) coming from STK500 (XT1/XT2) can also be
controlled from AVR Studio®.
The AVR RESET coming from STK500 (NRST - EXP.CON 0) can also control the
STK525. STK525 is protected against +12V RESET pulse (parallel programing not
allowed for AT90USBxxx on STK525) coming from STK500.
2.8In-System Programming
2.8.1Programming with USB bootloader: DFU (Devi ce Firmware Upgrade)
AT90USBxxx part comes with a default factory pre-programmed USB bootloader
located in the on-chip boot section of the AT90USBxxx. This is the easiest and fastest
way to reprogram the device directly over the USB interface. The “Flip” PC side
application available for free on Atmel website offers a flexible and user friendly
interface to reprogram the application over the USB bus.
2-20STK525 Hardware User Guide
7608A–AVR–04/06
The HWB pin of the A T90USB xx x allows to forc e the boot load er sec tion exec ution after
reset. (Refer to AT90USBxxx datasheet section “boot loader support”). To force
bootloader execution, operate as follows:
Press both “RST” and “HWB” push buttons
First release the “RST” push button
Release the “HWB” push button
For more information about the USB bootloader and FLIP software, please refer to the
‘USB bootloader datasheet’ document and ‘FLIP User Manual’.
2.8.2P rogramming with AVR ISP mkII Programmer
The AT90USBxxx can be programmed using specific SPI serial links. This sub section
will explain how to connect the programmer.
The Flash, EEPROM and all Fuses and Lock Bits options ISP-programm able can be
programmed individually or with the sequential automatic programming option.
The AVR ISP mkII progra mmer is a com pact an d easy-to-use In-System P rogramming
tool for developing applications with AT90USBxxx. Due to the small size, it is also an
excellent tool for field upgrades of existing applications.
Using the STK525
The AVR ISP programming interface is integrated in AVR Studio®.
To program the device using AVR ISP programmer, connect the 6-wire cable on the ISP
connector of the STK525 as shown in Figure 2-20.
Note:See AVR Studio® on-line Help for informati on.
Figure 2-20 . Programming from AVR ISP mkII programmer
2.8.3Programmin g with STK500
The AT90USBxxx can be programm ed using the serial program ming mode in the A VR
Studio STK500 software. The software interface (In-System Programming of an external
target system) is integrated in AVR S tud i o ®.
STK525 Hardware User Guide2-21
7608A–AVR–04/06
Using the STK525
To program the dev ice using ISP f rom STK500, conne ct the 6-wire cable between the
ISP6PIN connector of the STK500 board and the ISP connector of the STK525 as
shown in Figure 2-18.
Note:See AVR Studio® on-line Help for informati on.
Note:The high voltage parallel programming mode with STK500 is not available for an
STK525. To reprogram an AT90USBxxx part in parallel mode, use an STK501 extension
board (AT90USBxxx product pinout is compatible with the STK501 parallel programing
mode).
2.8.4Programming with A VR JTAG ICE
The AT90USBxxx can be programmed using specific JTAG link. This sub-section will
explain how to connect and use the AVR JTAG ICE.
Note:When the JTAGEN Fuse is unprogrammed, the four TAP pins are normal port pins, and
the TAP controller is in reset. When programmed, the input TAP signals are internally
pulled high and the JTAG is enabled for Boundary-scan and programming. The
AT90USBxxx device is shipped wit h this fuse programmed.
Figure 2-21 . Connecting AVR JTAG ICE to STK525
The Flash, EEPROM and all Fuse and Lock Bit options ISP-programmable can be
programmed individually or with the sequential automatic programming option.
Note:See AVR Studio® on-line Help for informati on.
2-22STK525 Hardware User Guide
7608A–AVR–04/06
2.9Debugging
2.9.1Debugging with AVR JTAG ICE mkII
Every STK525 can be used for debugging with JTAG ICE MK II.
Connect the JTAG ICE mkII as shown in Figure 2-21, for debugging help, please refer to
AVR Studio® Help information.
When using JTAG ICE MK II for debugging, and as AT90USBxxx parts are factory
configured with the higher security level set, a chip erase operation will be performed on
the part before debugging. Thus the on-ch ip flash bootloader will be erased. It can be
restored after the debug session using the bootloader hex file available from ATM EL
website.
2.10Test Points
There are 8 test points implemented, these test points are referred in the full schematics
section.
Using the STK525
Config.
Pads
Reference
T1D+USB D+ data line
T2D-USB D- data line
T3ArefAnalog reference
T4MicMicrophone preamplifier output
T53.3V3.3V internal power supply
T65V5V inter nal power supply
T7GndGround
T8VbusUSB Vbus power supply
Related SignalsFunction
STK525 Hardware User Guide2-23
7608A–AVR–04/06
Using the STK525
2.11Configuration Pads
Configuration pads are used to disconnect/connect on-board peripherals or elements, their
default configuration is: connect.
2.11.1Confi guration P ads Listing
Table 2-5 . Configuration Pads
Config.
Pads
Reference
CP1°c sensor (PF0)
CP2pot. (PF1)
CP3Mic.(PF2)
2.11.2Configuration Pads - Disconnection
Figure 1. Configuration Pad - Disconnection
2.11.3Confi guration P ads - Co nn e ct i on
Related
Signals
Function
This configuration pad is used to disconnect/connect the
CTN sensor from STK525.
This configuration pad is used to disconnect/connect the
potentiomet er from STK525.
This configuration pad is used to disconnect/connect the
microphone preamplifier output from STK525.
Cut Connection
Figure 2. Configuration Pad - Re-connection
WireDroplet of So lder
2-24STK525 Hardware User Guide
7608A–AVR–04/06
2.12Solder Pads
2.12.1Solder Pads Listing
Using the STK525
Solder pads are used to disconnect/connect on-board peripherals or elements, their default
configuration is: disconnect.
Table 2-6 . Solder Pads
Solder.
Pads
Reference
SP1AVCC/VCCThis solder pad can be used to bypass L1.
SP2NRST/RESETThis solder pad can be used to bypass D1.
SP33.3V
SP4PD1/CTS
SP5PD0/RTS
SP6VBUSThis solder pad allows to bypass U5 VBUS current limit er.
SP7RS-CTS
SP8RS-RTS
Related
Signals
Function
This solder p ad is reserved to connect 3.3V power supply to
the N.C pin of Expand0/1
This solder pa d all ows to enable the logical CTS signal for
hardware contro l flow on RS232 interface.
This solder pa d all ows to enable the logical R TS signal for
hardware contro l flow on RS232 interface.
This solder pa d all ows to enable the physical CTS signal for
hardware contro l flow on RS232 interface.
This solder pa d all ows to enable the physical R TS signal for
hardware contro l flow on RS232 interface.
STK525 Hardware User Guide2-25
7608A–AVR–04/06
Troubleshooting Guide
Figure 3-1 . Troubleshooting Guide
ProblemReasonSolution
Section 3
The Green “VCC-ON”
LED is not on
STK525 does not work
The A T90USBxxx cannot
be programmed
AVR Studi o does not
detect the AVR tool used
No power supply
The
STK500 ISP header
is not connected.
The A VR ISP probe is
not connected
The A V R JTAG ICE
probe is not
connected
The memory lock bits
are programmed
The fuse bits are
wrongly programmed
Programming too fast
with ISP SPI
Serial/USB cable is
not connected, or
power is off
PC COM port is in
use
Verify the power supply source
Verify the power supply source
Connect the DC power supply source, o r
USB interface or STK500.
Connect a 6-pin flexible cable from
STK500 ISP 6-PIN header to the correct
STK525 ISP header (page 21)
Connect the AVR ISP 6-PIN header to
the correct STK525 ISP header (page
21)
Connect the JTAG ICE 10-PIN header to
the correct STK525 JTAG header (page
22)
Erase the memory before programming
Check the fuse bits
Check oscillator settings and make sure
it is not set higher than SPI clock
Connect seri al cable to RS232 (STK5 00 AVR ISP) and check power connect ions
Connect serial cable to USB (JATG ICE
MKII, AVR ISPmkIIl) and chec k power
connections
Disable other programs that are using
PC COM port.
Change PC COM port
AVR Studio does not
detect COM port.
STK525 Hardware User Guide3-26
Disable COM port auto-detection in AVR
St udio file menu. Force COM port to
correct COM port
7608A–AVR–04/06
Troubleshooting Guide
STK525 Hardware User Guide3-27
7608A–AVR–04/06
Section 4
Technical Specifications
System Unit
– Physical Dimensions ................................................. L=119 x W=56 x H=27 mm
– Weight...........................................................................................................70 g
Operating Conditions
– Internal Voltage Supply .............. ........................ ...............................2.7V - 5.5V
– External Voltage Supply ..........................................................9V -15V (100mA)
Connections
– USB Connector......................................................................Mini AB receptacle
– USB Communications .......................................................Full speed/low speed
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