Reusch Elektronik AVR Stick Series User manual

AVR Stick
AVR USB Module with Auto Reset
Rev. 1.0
Documentation Rev. 10
Reusch Elektronik
© 2010 Reusch Elektronik, Dipl.-Ing. (FH) Rainer Reusch
.reusch-elektronik.de
http://products.re orld.eu/avrstick.htm
File: AVR_Stick_Manual
Created: 2010-09-10
Changed: 2010-12-09

Contents
1. Introduction........................................................................................................................1
1.1 A embly Variation ............................................................................................................................... 1
1.2 U age.................................................................................................................................................... 1
2. Technical Information.........................................................................................................2
2.1 Schematic.............................................................................................................................................. 2
2.2 ISP Pin A ignment............................................................................................................................... 2
2.3 Board of the Stick.................................................................................................................................. 3
2.4 Alternative Pin Function ....................................................................................................................... 3
2.5 Technical Data....................................................................................................................................... 4
3. Application Note ...............................................................................................................4
3.1 Memory Programming........................................................................................................................... 4
4. Concluding Remark ..........................................................................................................5
4.1 Application Software.............................................................................................................................. 5
4.2 Link ...................................................................................................................................................... 6
4.3 Statement and Di claimer...................................................................................................................... 6
4.4 Technical Support.................................................................................................................................. 6
Reusch Elektronik
Dipl.-Ing. (FH) Rainer Reusch
Blumenstr. 13
D-88097 Eriskirch
Germany
Phone: [phone]
Fax: [phone]
E-Mail: [email protected]
Homepage: .reusch-elektronik.de
© 2010 Reusch Elektronik, Dipl.-Ing. (FH) Rainer Reusch
his document is protected by copyright law. It is prohibited to copy or distribute without permission of
Reusch Elektronik.

Reu ch Elektronik AVR Stick
1. Introduction
AVR Stick is a tiny interface module in stick format, containing an Atmel AVR micro
controller with USB interface. he device is designed for USB applications, which doesn't
need any connectivity to peripherals. For simple interfacing, some controller I/O ports are
available on pads. he stick comes in a compact size, suitable for an also available compact
casing. It contains an USB-A mail plug for direct plugging into an USB hub.
he stick contains an 8 bit RISC controller from Atmel, either AT90USB162 or
ATMEGA32U2. his controller is clocked with 16MHz. he USB communication confirms
USB 2.0 specification. he controller supports “full speed” (12MBit/s).
he stick will be delivered with the original Atmel bootloader. It can be programmed by the
Windows ® software “Atmel Flip” via USB. For special purposes, an Atmel compatible ISP
interface is available on solder pads for “in system” programming (a special programming
device, such as Atmel AVRISP MKII, is required).
he AVR Stick is very easy to use, because it contains all necessary and time critical
components.
1.1 Assembly Variations
he module is available in two assembly versions:
•as “AVR-Stick 162 AR”, assembled with A 90USB162 from, with Auto Reset
•as “AVR-Stick U2 AR”, assembled with A MEGA32U2, with Auto Reset
Both assembly variations are also available without Auto Reset Feature.
1.2 Usage
Without firmware, the module always will enter the bootloader. It will respond as “Atmel
device” at the personal computer. At the first plugging, it is asked for a driver installation.
You have to use the LibUSB-Win32 drivers, which are coming with the “Atmel Flip”
installation package.
After the driver installation, the device can be accessed by “Atmel Flip” to upload your
firmware application. After programming, the device has to be unplugged from USB (turn
off power supply) and the “boot” jumper (HWB port) has to be changed to “open” state.
When the device is plugged again, it will run with your uploaded firmware.
o reenter the bootloader, close the “boot” jumper (HWB port) and replug the stick. Only
assembly version without Auto Reset (AR) feature: It is necessary, to reset the controller.
For this reason, short the Reset (pin 5) and the Gnd pin (pin 6) of the ISP connector K4.
Please note:
Setting or removing the “boot” jumper while stick is plugged, doesn't have any effect! You
have to reset the controller, either through replugging or shorten the reset pad with ground
for a moment.
he device also can be programmed via ISP interface and ISP programmer. For more
information read the application note chapter, please.
Rev. 1.0 Page 1

Reu ch Elektronik AVR Stick
2. Technical Information
2.1 Schematic
Only assembly version with Auto Reset (AR) feature: A ceramic capacitor with
100nF is connected between pin 5 (Reset) and pin 6 (Gnd) of the ISP connector (K4).
2.2 ISP Pin Assignment
he in-system programming adapter is a 6 pole pad array (K4), which corresponds in
order with the 6 pin Atmel ISP connector. herefore the usual Atmel in-system
programmers (such as “AVR ISP MKII”) are suitable.
Pin Function irection Atmel ISP connector
6 * Gnd 6
5 * Re et input 5
4 MOSI input 4
3 SCLK input 3
2 VCC output 2
1 MISO output 1
*) Only AR version: A 100nF capacitor is connected between this two pins.
Rev. 1.0 Page 2

Reu ch Elektronik AVR Stick
2.3 Board of the Stick
2.4 Alternative Pin Functions
he following table shows the alternative function of each available pin of the controller.
Port Alternative Functions Connector
PD0 OC.0B, INT0 K2-1
PD1 AIN0, INT1 K2-2
PD2 RXD1, AIN1, INT2 K2-3
PD3 TXD1, INT3 K2-4
PD4 INT5, AIN3 K2-5
PD5 XCK, AIN4, PCINT12 K2-6
PD6 RTS, AIN5, INT6 K2-7
HWB PD7, CTS, AIN6, T0, INT7 * K3-2
PB0 SS, PCINT0 K5
PB1 SCLK, PCINT1 K4-3
PB2 PDI, MOSI, PCINT2 K4-4
PB3 PDO, MISO, PCINT3 K4-1
Re et PC1, dW ** K4-5
*) WB fuse has to be cleared via ISP programming. Disables ability of firmware upload
via USB!
**) RSTDISBL fuse has to be set via ISP programming. Disables ability of programming via
ISP!
Rev. 1.0 Page 3

Reu ch Elektronik AVR Stick
2.5 Technical ata
Supply Voltage 4.75V to 5.25V (USB upply voltage range)
Supply Current <30mA (depend on application)
Clock Frequency 16MHz (±0.5%)
PCB dimen ion 36,2mm x 12mm
Stick in ca ing dimen ion 61.5mm x 16.2mm x 8.7mm
Stick in ca ing weight 5 gramm
Operation Temperature -25°C to 70°C
Storage Temperature -25°C to 85°C
For further information related to the microcontroller, please refer to the Atmel data sheet
of the microcontroller.
3. Application Notes
3.1 Memory Programming
he Atmel microcontroller contains an USB bootloader as factory default. So there are
different ways, to program the flash memory and EEPROM of the microcontroller.
3.1.1 Bootloader and Flip
he USB bootloader, flashed as factory default, and the Software “Atmel Flip” (for
Microsoft Windows ®) can be used, to program the microcontroller over the USB interface
without special programming device. Install the “Flip” software package, before connecting
the module in bootloader mode first time. he software requires the LibUSB-Win32
drivers, which comes with the Atmel Flip installation package.
he USB bootloader will be executed, when the HWB pin (K3 closed) is set to low level (0
Volt) and a reset is done (pin 5 and 6 of K4 shorten for a moment). his manual reset is not
necessary for the Auto Reset (AR) featured version of this device. he module has to be
connected to the personal computer (running “Microsoft Windows”) via USB.
he module will be detected as Atmel device. he driver installation dialogue will be shown
at the first time. Chose “automatic installation”, if the LibUSB-Win32 drivers are already
installed. Start the “Flip” application. Chose the device (A MEGA32U2 or A 90USB162)
and the hex file for programming. Finally open an USB connection in “Flip”. Now the
microcontroller can be erased, programmed and verified.
he HWB pin has to be set to high level (K3 opened), before the loaded application will be
started. It is necessary, to replug the device (turn off and on the power) for proper USB
operation! Note: It isn't possible, to delete the bootloader or modify any fuses with “Flip”.
he “Atmel Flip” installation package can be downloaded from the Atmel homepage.
Search for “FLIP” or try the following link:
http://www.atmel.com/dyn/products/tools_card_mcu.asp?tool_id=3886
Rev. 1.0 Page 4

Reu ch Elektronik AVR Stick
3.1.2 In-System-Programming
he AVR Stick contains an Atmel ISP connector for in-system-programming. An Atmel ISP
compatible programming device (such as “AVRISP MKII”) is required. he advantages of
this programming method:
•full control over the microcontroller, all memories and fuses
•comfortable integration into “AVR Studio”
•no bootloader required
•the only way, to reflash the bootloader!
Note: For the first programming by ISP an “erase device” is necessary, to reset the fuses
(especially the lock bits). his will also erase the factory default bootloader! hat means,
the device no more can be programmed with “Atmel Flip”, until the bootloader (or
another) is reflashed!
Note for Auto Reset (AR) featured device: he in system programming may not
work properly, caused by the 100nF capacitor connected to reset pin. It might be
necessary, to remove this capacitor, if problems occurs.
3.1.3 ebug Wire
he alternative function for the Reset pin is the “debug Wire” pin. he dW pin can be used
for programming and debugging within the development environment (AVR Studio). A
J AG device with “debug Wire” support is required.
Note for Auto Reset (AR) featured device: his programming method can't be
applied!
3.1.4 High Voltage Programming
Because not all necessary pins of the controller are available, a high voltage programming
isn't supported.
4. Concluding Remarks
4.1 Application Software
You will find programming and application sample software on the product homepage.
Please visit the following URL:
http://products.reworld.eu/avrstick.htm
You will find additional information and tools on the following URLs.
Atmel AVR ools and Software:
http://www.atmel.com/dyn/products/tools_mcu.asp?family_id=607
Dean Cameras LUFA (Lightweight USB Framework for AVRs, formerly known as MyUSB):
http://www.fourwalledcubicle.com/LUFA.php
eensy USB Development Board:
http://www.pjrc.com/teensy/
Rev. 1.0 Page 5

Reu ch Elektronik AVR Stick
4.2 Links
Visit the following links for more information and downloads about this product, used
software modules and tools.
Reusch Elektronik homepage for electronic products:
http://products.reworld.eu
Atmel Corporation, AVR data sheets:
http://www.atmel.com/dyn/products/datasheets_mcu.asp?family_id=607
V-USB, Virtual USB Port for AVR microcontroller:
http://www.obdev.at/products/vusb/index.html
WinAVR, GCC development environment:
http://winavr.sourceforge.net/
LibUSB-Win32, USB drivers for Microsoft Windows ®:
http://libusb-win32.sourceforge.net/
4.3 Statement and isclaimer
his electronic device is designed under best known engineering guidelines. It confirms the
appropriate design rules. No warranty or liability is given for adherence, assured
properties, or damages which might be caused by the usage of this hardware or the
accessory software.
Note: his equipment has been tested and found to comply with the limits for a Class B
digital device. hese limits are designed to provide reasonable protection against harmful
interference in a residential installation. his equipment generates, uses and can radiate
radio frequency energy, and if not installed and used in accordance with the instruction
manual, may cause interference to radio communications. However, there is no guarantee
that interference will not occur in a particular installation.
4.4 Technical Support
We hope you'll understand, that technical support by phone is not possible. If You have
any questions, technical problems or You need information about other products from
Reusch Elektronik, please contact us by e-mail or Fax.
E-Mail: [email protected]
FAX: [phone]
We are able to handle inquiries in english and german language.
Don't hesitate to contact us, if You have demand for custom specific solutions!
Rev. 1.0 Page 6