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AtmeE
AVR XMEGA Microcontrollers
AT02667: XMEGA-E5 Xplained Hardware User's
Guide
APPLICATION NOTE
Features
Atmel® AVR® ATxmega32E5 microcontroller
OLED display with 128×32 pixels resolution
Ambient light sensor
Analog filter
Rotary Encoder with push button
Digital I/O
Two mechanical buttons
Two user LEDs
Four expansion headers
Board controller with USB interface
One power LED and one status LED
Description
The Atmel AVR XMEGA-E5 Xplained evaluation kit is a hardware platform to
evaluate the Atmel ATxmega32E5 microcontroller.
The kit offers a larger range of features that enables the Atmel AVR
XMEGA® user to get started using XMEGA peripherals right away and
understand how to integrate the XMEGA device in their own design.
Figure -1. XMEGA-E5 Xplained Kit
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Table of Contents
Features.......................................................................................................................... 1
Description.......................................................................................................................1
1. Related Items.............................................................................................................3
2. General Information...................................................................................................4
2.1. Preprogrammed Firmware............................................................................................................4
2.2. Power Supply............................................................................................................................... 4
2.3. Measuring the Atmel AVR XMEGA Power Consumption............................................................. 4
2.4. Communication through the USART-to-USB Gateway................................................................ 5
2.5. Programming the Kit.....................................................................................................................5
3. Connectors................................................................................................................ 6
3.1. Programming Headers................................................................................................................. 6
3.2. I/O Expansion Headers................................................................................................................ 6
4. Peripherals.................................................................................................................9
4.1. Mechanical Buttons...................................................................................................................... 9
4.2. LEDs.............................................................................................................................................9
4.3. Quadrature Encoder.....................................................................................................................9
4.4. OLED Display.............................................................................................................................10
4.5. Analog I/O...................................................................................................................................10
4.5.1. Ambient Light Sensor.................................................................................................. 10
4.6. Board Controller..........................................................................................................................11
5. Code Examples....................................................................................................... 13
6. Hardware Revision History and Known Issues........................................................14
6.1. Revision 1...................................................................................................................................14
7. Document Revision History..................................................................................... 15
8. Evaluation Board/Kit Important Notice.....................................................................16
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1. Related Items
The following list contains links to the most relevant documents, software and tools for the Atmel AVR
XMEGA-E5 Xplained:
Atmel AVR Xplained products
Xplained is a series of small-sized and easy-to-use evaluation kits for 8- and 32-bit AVR
microcontrollers. It consists of a series of low cost MCU boards for evaluation and demonstration of
feature and capabilities of different MCU families.
Atmel Xplained USB CDC driver
The Xplained USB CDC driver file supports both 32- and 64-bit versions of Windows® XP and
Windows 7. Driver installs are not necessary on Linux® operating systems.
XMEGA-E5 Xplained schematics
Package containing schematics, BOM, assembly drawings, 3D plots, layer plots…
AT02667: XMEGA-E5 Xplained Hardware Users Guide
This document.
AT02657: XMEGA-E5 Xplained Software User Guide
This application note is a user guide for the XMEGA-E5 Xplained demo software.
Atmel Studio 7
Atmel Studio 7 is a free Atmel IDE for development of C/C++ and assembler code for Atmel
microcontrollers.
Atmel JTAGICE3
JTAGICE3 is a mid-range development tool for Atmel 8- and 32-bit AVR microcontrollers with on-
chip debugging for source level symbolic debugging, NanoTrace (if supported by the device) and
device programming.
Atmel AVR JTAGICE mkII
AVR JTAGICE mkII is a mid-range development tool for Atmel 8- and 32-bit AVR devices with on-
chip debugging for source level symbolic debugging, NanoTrace (if supported by the device), and
device programming (superseded by JTAGICE3).
Atmel AVR ONE!
AVR ONE! is a professional development tool for all Atmel 8- and 32-bit AVR devices with on-chip
debug capability. It is used for source level symbolic debugging, program trace, and device
programming. The AVR ONE! supports the complete development cycle and is the fastest
debugging tool offered from Atmel.
Atmel AVR Dragon
AVR Dragon sets a new standard for low cost development tools for 8- and 32-bit AVR devices
with on-chip debug (OCD) capability.
IAR Embedded Workbench® for Atmel AVR
IAR Embedded Workbench is a commercial C/C++ compiler that is available for 8-bit AVR. There
is a 30 day evaluation version as well as a 4k (code size limited) kick-start version available from
their website.
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Atmel Power measurement Header J1 header Header J3 USB F'DI header connector J I Power & Status LEDs Mechanical button . Quadrature encoder SW1 ‘ ' ' ' . ‘ 4 ‘7 Seleminn switch SW103 User LEDS 0and1 Quadrature encoder SW102 Light sensor Mechanical button SWO Header J2 OLED Display Header J4
2. General Information
The Atmel AVR XMEGA-E5 Xplained kit is intended to demonstrate the Atmel AVR ATxmega32E5
microcontroller. The figure below shows the available features on the board.
Figure 2-1. Overview of the XMEGA-E5 Xplained Kit
2.1. Preprogrammed Firmware
The ATxmega32E5 on the XMEGA-E5 Xplained is pre-programmed with a default firmware. The detailed
description of the software is available in the AT02657: XMEGA-E5 Xplained Software User Guide.
Project and source files are available in Atmel Studio and Atmel Software Framework.
2.2. Power Supply
The kit needs an external power supply that can deliver 5V and up to 500mA. The actual current
requirement for the board is much less than 500mA but in order to be able to power optional expansion
boards this margin is recommended.
The power can be applied to the board either via the USB connector or on pin 10 on header J3. The USB
connector is the preferred input because it is then possible to connect expansion boards on top of the J3
header.
The 5V (USB supply voltage) is regulated down to 3.3V with an onboard LDO regulator, which provides
power to the entire board. Expansion top boards that require 5V will get this from the header J3 pin 10.
2.3. Measuring the Atmel AVR XMEGA Power Consumption
As part of an evaluation of the Atmel AVR ATxmega32E5, it can be of interest to measure its power
consumption. Because the XMEGA has a separate power plane (VCC_MCU_P3V3) on this board it is
possible to measure the current consumption by measuring the current flowing into this plane. The
VCC_MCU_P3V3 plane is connected via a jumper to the main power plane (VCC_P3V3) and by
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replacing this with an ampere meter it is possible to determine the current consumption. To locate the
power measurement header, refer to Figure 2-1.
Attention: 
Do not power the board without having the jumper or an ampere meter mounted since this can
cause latch-up of the Atmel AVR ATxmega32E5 due to current flow into the I/O pins.
2.4. Communication through the USART-to-USB Gateway
The ATxmega32E5 USART is connected to a USART on the Atmel AT32UC3B1256. The ATxmega32E5
USART is communicating at 57600 baud using one start bit, eight data bits, one stop bit, and no parity.
When the AT32UC3B1256 device is enumerated (connected to a PC). The data transmitted from the
ATxmega32E5 is passed to a (virtual) COM port. This means that it is possible to use a terminal program
on a PC to receive the transmitted data. Similarly data transmitted from the PC COM port is passed to the
ATxmega32E5 USART through the gateway.
2.5. Programming the Kit
The kit can be programmed using an external programming tool.
How a programmer can be connected to the kit is described in Programming Headers.
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3. Connectors
The Atmel AVR XMEGA-E5 Xplained kit has four 10-pin 100mil headers, and one 6-pin 100mil header.
The 6-pin header is used for programming the Atmel AVR ATxmega32E5, and the 10-pin headers are
used to access spare analog and digital pins on the Atmel AVR XMEGA (expansion headers).
3.1. Programming Headers
The XMEGA can be programmed and debugged by connecting an external programming/debugging tool
to the PDI header shown in Figure 2-1.
The gray XMEGA PDI adapter must be used on the Atmel AVR JTAGICE mkII probe when connecting to
the XMEGA-E5 Xplained board.
The green standoff adaptor nr.3 (ref.A08-0254) has to be used on the Atmel AVR ONE! probe when
connecting to the XMEGA-E5 Xplained board.
Table 3-1. XMEGA Programming and Debugging Interface – PDI
Pin on programming header PDI
1 DATA
2 VCC
3 -
4 -
5 CLK
6 GND
3.2. I/O Expansion Headers
The Atmel AVR XMEGA-E5 Xplained headers J1, J2, J3, and J4 offer access to the I/Os of the
microcontroller in order to expand the board, for example by mounting a top module onto the board.
The header J1 offers digital communication interfaces like UART, TWI, and SPI. The table below shows
how the Atmel AVR XMEGA is connected to the header.
Note that when using TWI no pull-ups are mounted on the board from the factory, so it is required to
enable the internal pull-ups of the device.
Table 3-2. Expansion Header J1
Pin on J1 Name on J1 XMEGA pin Shared with on-board functionality
1 SDA PC0 Connected to the Board Controller 1
2 SCL PC1 Connected to the Board Controller 1
3 RXD PC2 -
4 TXD PC3 -
5 SS PC4 Connected to the Board Controller 2
1Need to mount R408/R409 to connect TWI lines to Board Controller.
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Pin on J1 Name on J1 XMEGA pin Shared with on-board functionality
6 MOSI PC7 Connected to the Board Controller 2
7 MISO PC6 Connected to the Board Controller 2
8 SCK PC5 Connected to the Board Controller 2
9 GND - -
10 VCC_P3V3 - -
Header J2 is connected to analog ports of the XMEGA as shown in the table below.
Table 3-3. Expansion Header J2
Pin on J2 Name on J2 XMEGA pin Shared with on-board functionality
1 ADC0 PA0 -
2 ADC1 PA1 -
3 ADC2 PA2 -
4 ADC3 PA3 -
5 ADC4 PA4 -
6 ADC5 PA5 Quadrature Encoder Button 3
7 ADC6 PA6 Quadrature Encoder Output 4
8 ADC7 PA7 Quadrature Encoder Output 4
9 GND - -
10 VCC_P3V3 - -
Header J3 is connected to digital ports of XMEGA. The table below shows the mapping of the XMEGA
I/O to J3.
Table 3-4. Expansion Header J3
Pin on J3 Name on J3 XMEGA pin Shared with on-board functionality
1 GPIO0 PR0 Shared with OLED display: data/cmd
function
2 GPIO1 PR1 Shared with OLED display: CS function
3 GPIO2 QENC_A Quadrature Encoder Output 5
4 GPIO3 QENC_B Quadrature Encoder Output 5
5 GPIO4 PC4/ SS
6 GPIO5 PC7/MOSI
2Need to mount R410/R411/R412/R413 to connect SPI lines to Board Controller.
3Can be disconnected from on-board functionality by cut-straps.
4Can be disconnected using SW103 mechanical switch.
5Quadrature encoder outputs can be accessible on this header when SW103 mechanical switch is
pushed up.
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Pin on J3 Name on J3 XMEGA pin Shared with on-board functionality
7 GPIO6 PC6/MISO
8 GPIO7 PC5/SCK
9 GND - -
10 VCC_P5V0 - -
Header J4 offers digital communication interfaces such as UART and TWI, but care must be taken
because some pins are also connected to on-board peripherals.
Table 3-5. Expansion Header J4
Pin on J4 Name on J4 XMEGA pin Shared with on-board functionality
1 SDA PD0 Shared with button SW100 (silkscreen
SW0)
2 SCL PD1 Shared with Light sensor 6
3 RXD PD2 Shared with button SW101(silkscreen
SW1)
4 TXD PD3 Shared with OLED display: reset
function
5 SS PD4 Shared with LED D100 (silkscreen
LED0)
6 MOSI PD7 Connected to the Board Controller 7
7 MISO PD6 Connected to the Board Controller 7
8 SCK PD5 Shared with LED D101 (silkscreen
LED1)
9 GND - -
10 VCC_P3V3 - -
6Can be disconnected from on-board functionality by cut-strap J100.
7RXD and TXD lines swapped from PD3 and PD4 and used for communication with board controller.
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4. Peripherals
4.1. Mechanical Buttons
Two mechanical buttons are connected to the Atmel AVR XMEGA. All buttons have no external pull-ups
so the user has to activate internal pull-ups in order to use them. When a button is pressed it will drive the
I/O line to GND.
Table 4-1. Mechanical Button Connection
Pin on XMEGA Silkscreen text on PCB
PD0 SW0
PD2 SW1
4.2. LEDs
There are two yellow LEDs available on the board that can be turned ON and OFF. The LEDs can be
activated by driving the connected I/O line to GND.
Table 4-2. LED Connections
Pin on XMEGA LED
PD4 Yellow LED0
PD5 Yellow LED1
One green LED (power indicator) and one red LED (status) are also present inside the same package
and therefore the colors can be mixed to orange when both are activated. The two LEDs are controlled
via the Board Controller and the user has no access to them.
4.3. Quadrature Encoder
The Quadrature Encoder (SW102) is made of one mechanical button and two outputs. These outputs are
connected to a mechanical switch (SW103), which enables to either connect them to the XMEGA pins or
let them be accessible on the J3 header.
Table 4-3. Quadrature Encoder Connections
Pin on XMEGA Pin on J3 header Switch SW103 Quadrature Encoder pins
PA5 8 NA NA 5 (button)
PA6 8NA 2-1 (switch pushed down) 1 (channel A)
PA7 8NA 5-4 (switch pushed down) 3 (channel B)
NA PIN3 2-3 (switch pushed up) 1 (channel A)
NA PIN4 5-6 (switch pushed up) 3 (channel B)
8Signal also connected to header J2.
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4.4. OLED Display
The OLED display on the XMEGA-E5 Xplained board is UG-2832HSWEG04 manufactured by WiseChip
Semiconductor Inc. It has a resolution of 128 × 32 pixels. In the design the display is connected via a SPI
based interface. Detailed information about the display can be obtained from the display datasheet.
The connection between the MCU and the OLED display is shown in the table below.
Table 4-4. OLED Display Connection
Pin on XMEGA Function on OLED
PR0 Data_command
PC5 SCK
PC7 MOSI
PC4 SS
PD3 RESET
4.5. Analog I/O
4.5.1. Ambient Light Sensor
The ambient light sensor TEMT6000X01 from Vishay Semiconductors is sensitive to visible light much
like the human eye. The measurement circuitry is configured to measure the illuminance from ~10 to
~900lx when the internal VCC/1.6 reference is used.
The data in Table 4-6 which shows the relationship between illuminance and output voltage of the sensor
circuitry is generated based on the symbols and formulas shown in the table below.
Table 4-5. Symbol Description for Illuminance Calculation
Symbols Description
ICA Calibrated sensor responsitivity at 100lx. This is 50μA according to the sensor
datasheet.
EvIlluminance
I Current through the sensor
U Output voltage of the sensor circuitry that is provided to the ADC
R Series resistor of the sensor circuitry. 4.7kΩ has been chosen in this design.
Ev = 100 × I / ICA Illuminance is calculated based on the relation of the actual current through the
sensor to the calibrated value at 100lx
I = U / R Since the ADC measures the voltage across the series resistor of the sensor
circuitry it is necessary to calculate the voltage based on the current
U = (Ev × R × ICA) / 100 Based on the current and the illuminance the output voltage of the sensor
circuitry can be calculated
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Table 4-6. Illuminance vs. ADC Input Voltage
Illuminance [lux] ADC input [V] Illuminance
1 0.0024 Dusk
10 0.0235 Dusk
20 0.0470 Dusk
30 0.0705 Dusk
40 0.0940 Dusk
50 0.1175 Living room
60 0.1410 Living room
70 0.1645 Living room
80 0.1880 Living room
90 0.2115 Living room
100 0.2350 Living room
200 0.4700 Office lighting
300 0.7050 Office lighting
400 0.9400 Office lighting
500 1.1750 Office lighting
600 1.4100 Office lighting
700 1.6450 Office lighting
800 1.8800 Office lighting
900 2.1150 Office lighting
1000 2.3500 Overcast day
4.6. Board Controller
The Atmel AT32UC3B1256 board controller and the Atmel ATxmega32E5 are connected through TWI,
SPI, and USART interfaces. All interfaces can be used to communicate between the devices, but only the
USART is implemented by default on the board controller.
Table 4-7. ATxmega32E5 and Board Controller Communication Interface
Interface ATxmega32E5 pin Atmel AT32UC3B1256 pin
UART RX 9 PD6 PA24
UART TX 9PD7 PA23
TWI SCL 10 PC1 PA09
9This represents the RX and TX on the ATxmega32E5. The RX is connected to TX on the other
device, and vice versa.
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Interface ATxmega32E5 pin Atmel AT32UC3B1256 pin
TWI SDA 10 PC0 PA10
SPI SS 11 PC4 PA16
SPI MOSI 11 PC7 PA14
SPI MISO 11 PC6 PA25
SPI SCK 11 PC5 PA17
10 These TWI signals can be reconnected by placing a 0Ω resistor or a solder drop on R408 and R409
footprints.
11 These SPI signals can be reconnected by placing a 0Ω resistor or a solder drop on R410, R411,
R412, and R413 footprints.
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5. Code Examples
The example application is based on the Atmel AVR Software Framework that is included in Atmel Studio
6. The AVR Software Framework can also be found as a separate package online at:
http://www.atmel.com/tools/avrsoftwareframework.aspx.
For more information about the code example, see the application note Atmel AT02657 XMEGA-E5
Xplained Software Users Guide.
The Atmel AT32UC3B1256 board controller is also pre-programmed with a bootloader and a USART-to-
USB gateway application, which can be used to communicate with the target controller ATxmega32E5.
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6. Hardware Revision History and Known Issues
To identify the revision of the kit, locate the bar-code sticker on the back side of the board. The first line
on the sticker shows the product ID and the revision. For example “A09-1842/1” can be resolved to
ID=A09-1842 and revision=1.
6.1. Revision 1
Revision 1 of XMEGA-E5 Xplained is the initial released version, there are no known issues.
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7. Document Revision History
Revision Date Changes
B 08/2016 Updated pictures
A 04/2013 Initial document release
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8. Evaluation Board/Kit Important Notice
This evaluation board/kit is intended for use for FURTHER ENGINEERING, DEVELOPMENT,
DEMONSTRATION, OR EVALUATION PURPOSES ONLY. It is not a finished product and may not
(yet) comply with some or any technical or legal requirements that are applicable to finished products,
including, without limitation, directives regarding electromagnetic compatibility, recycling (WEEE), FCC,
CE or UL (except as may be otherwise noted on the board/kit). Atmel supplied this board/kit "AS IS",
without any warranties, with all faults, at the buyer's and further users' sole risk. The user assumes all
responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies Atmel
from all claims arising from the handling or use of the goods. Due to the open construction of the
product, it is the user's responsibility to take any and all appropriate precautions with regard to
electrostatic discharge and any other technical or legal concerns.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER USER NOR ATMEL
SHALL BE LIABLE TO EACH OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES.
No license is granted under any patent right or other intellectual property right of Atmel covering or
relating to any machine, process, or combination in which such Atmel products or services might be or
are used.
Mailing Address: Atmel Corporation
1600 Technology Drive
San Jose, CA 95110
USA
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