• Two user LEDs, one power LED, and one status LED
• Four expansion headers
• Touch
• Two Atmel AVR QTouch
®
button
• Memory
• microSD Card
Description
The Atmel AVR XMEGA-C3 Xplained evaluation kit is a hardware platform to
evaluate the Atmel ATxmega384C3 microcontroller.
The kit offers a larger range of features that enables the Atmel AVR XMEGA
get started using XMEGA peripherals right away and understand how to integrate the
XMEGA device in their own design.
®
user to
Figure 1. XMEGA-C3 Xplained Evaluation Kit
2
Table of Contents
1. Related Items ..................................................................................... 3
2. General Information ........................................................................... 4
The following list contains links to the most relevant documents, software and tools for the Atmel AVR XMEGA-C3
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
are not necessary on Linux
®
operating systems.
®
XP and Windows 7. Driver installs
XMEGA-C3 Xplained schematics
Package containing schematics, BOM, assembly drawings, 3D plots, layer plots…
AVR1925: XMEGA-C3 Xplained Hardware Users Guide
This document.
AVR1939: XMEGA-C3 Xplained Getting Started Guide
This application note is a getting started guide for the XMEGA-C3 Xplained.
AT01639: XMEGA-C3 Xplained Software User Guide
This application note is a user guide for the XMEGA-C3 Xplained demo software.
AVR1916: XMEGA USB DFU Boot Loaders
This application note is a user guide for the XMEGA USB DFU boot loaders.
Atmel Studio 6
Atmel Studio 6 is a free Atmel IDE for development of C/C++ and assembler code for Atmel microcontrollers.
Atmel FLIP (Flexible In-system Programmer)
BatchISP (FLIP) is a command line tool for programming the flash and EEPROM memories of the AVR and is part of
the FLIP installation. It can be used to communicate with the preprogrammed USB DFU boot loader.
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.
The Atmel AVR XMEGA-C3 Xplained kit is intended to demonstrate the Atmel AVR ATXmega384C3 microcontroller.
Figure 2-1 shows the available feature on the board.
Figure 2-1. Overview of XMEGA-C3 Xplained Kit
2.1 Preprogrammed Firmware
The ATxmega384C3 on the XMEGA-C3 Xplained is pre-programmed with a boot loader and a default firmware. The
detailed description of the software is available in the AT01639 XMEGA-C3 Xplained Software User Guide.
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 the 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 ATxmega384C3, 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 that is flowing into this plane. The VCC_MCU_P3V3 plane is connected via a
jumper to the main power plane (VCC_P3V3) and by replacing the jumper with an amperemeter it is possible to
determine the current consumption. To locate the power measurement header, refer to Figure 2-1.
Warning: Do not power the board without having the jumper or an amperemeter mounted since this can cause
latch-up of the Atmel AVR ATxmega384C3 due to current flow into the I/O pins.
2.4 Programming the Kit
The kit can be programmed either from an external programming tool or through an USB boot loader which is preprogrammed on the device.
The boot loader is evoked by pushing the push button (SW0) during power-on, that is push and hold the button and
hence connect an USB cable to the kit. Programming can be performed through the DFU programmer FLIP.
How a programmer can be connected to the kit is described in Section 3.1.
The Atmel AVR XMEGA-C3 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 ATxmega384C3, 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 grey XMEGA PDI adapter on the Atmel AVR JTAGICE mkII probe has to be used when connecting to the XMEGAC3 Xplained board.
The green standoff adaptor nr.3 (ref.A08-0254) on the Atmel AVR ONE! probe has to be used when connecting to the
XMEGA-C3 Xplained board.
Table 3-1. XMEGA Programming and Debugging Interface – PDI
3 -
4 -
3.2 I/O Expansion Headers
The Atmel AVR XMEGA-C3 Xplained headers J1, J2, J3, and J4 offer access to the I/O 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. Table 3-2shows how the Atmel AVR
XMEGA is connected to the header.
Note: When using TWI note that no pull-ups are mounted on the board from the factory, so it is required to either
enable the internal pull-ups of the device or to mount the external pull-ups on the available footprints (R200 and
R201). Refer to the assembly drawing in the design documentation for the location of these footprints.
Table 3-2. Expansion Header J1
3 RXD PC2 -
The header J2 is connected to analog ports of the XMEGA as shown in Table 3-3.
The header J3 is connected to digital ports of XMEGA. Table 3-4shows the mapping of the XMEGA I/O to J3.
Table 3-4. Expansion Header J3
Note: 1. Can be disconnected from onboard functionality by cut-straps.
The 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
Note: 1. Can be disconnected from onboard functionality by cut-strap (J204).
The Atmel AVR XMEGA-C3 Xplained has a microSD card standard connector mounted. The SWA is used for detecting
the microSD card. When a microSD card plugs in, the SWA will be pulled to GND. The connection to the MCU is shown
in Table 4-1.
Table 4-1. microSD Card Connection
PE5 SS
4.2 Atmel AVR QTouch Button
The XMEGA-C3 Xplained kit has one Atmel QTouch button and the connection to the Atmel AVR XMEGA is shown in
Table 4-2. The QTouch sensor, a copper fill, is located on the second layer of the board (same as GND layer). The
sensor is shielded by the third layer (VCC layer) and therefore the sensor is not affected by any touches from the back
side of the board.
Table 4-2. QTouch Button Connection
PF6 SNS1
PF7 SNSK1
4.3 Mechanical Buttons
Two mechanical buttons are connected to Atmel AVR XMEGA. All buttons have external pull-ups so there is no need 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 4-3. Mechanical Button Connection
PF2 SW 1
4.4 LEDs
There are four LEDs available on the board that can be turned on and off. Two yellow LEDs, one green LED (power
indicator LED), and one red LED (status LED). The green and red LEDs are inside the same package and therefore the
colors can be mixed to orange when both are activated. The yellow LEDs and the red LED can be activated by driving
the connected I/O line to GND. The green LED is controlled via a FET and is by default on when the board is powered.
However, this power indicator LED can also be turned off by driving the gate of the FET to GND.
The OLED display on the XMEGA-C3 Xplained board is UG-2832HSWEG04 which comes from 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 Table 4-5.
Table 4-5. OLED Display Connection
4.6 Analog I/O
4.6.1 Temperature Sensor
The temperature sensor circuitry consists of a serial connection of a normal and a NTC resistor. The NTC sensor is
from Murata and some part details are shown in Table 4-6, more information can be obtained from the manufacturer’s
website.
Table 4-6. NTC Characteristics
Table 4-7 shows the temperature vs. resistance characteristic. The values are available from Murata in the datasheet of
Table 4-7. Resistance vs. Temperature (from Murata)
Temp.
[°C]
-29 2055.558 1 338.006 31 75.675 61 21.374
-21 1225.531 9 220.847 39 52.934 69 15.760
-12 707.524 18 140.142 48 36.063 78 11.344
NTC resistance
[kΩ]
Temp.
[°C]
NTC resistance
[kΩ]
Temp.
[°C]
NTC resistance
[kΩ]
Temp.
[°C]
NTC resistance
[kΩ]
Two common approximations can be used to model the temperature vs. resistance characteristic; these are the B
parameter and the Steinhart-Hart equations. Coefficients for both formulas can be calculated from Table 4-7.
When the internal reference VCC/1.6 is used and the ADC is measuring in signed single ended mode the codes in
Table 4-8 can be read from the ADC at the various temperatures. The calculation is based on Table 4-7.
Table 4-8. ADC Codes vs. Temperature (Signed Single Ended Mode with Internal VCC/1.6 Reference)
Calibrated sensor responsivity at 100lx. This is 50µA according to the sensor datasheet
Ev
Illuminance
I
Current through the sensor
U
Output voltage of the sensor circuitry that is provided to the ADC
calibrated value at 100lx
necessary to calculate the voltage based on the current
calculated
Illuminance [lux]
ADC input [V]
Illuminance
1
0.0024
Dusk
10
0.0235
Dusk
20
0.0470
Dusk
30
0.0705
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
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
4.6.2 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 4-10 which shows the relationship between illuminance and output voltage of the sensor circuitry is
generated based on the symbols and formulas in Table 4-9.
Table 4-9. Symbol Description for Illuminance Calculation
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
I = U / R
U = (Ev × R × ICA) / 100
Table 4-10. Illuminance vs. ADC Input Voltage
40 0.0940 Dusk
300 0.7050 Office lighting
Since the ADC measures the voltage across the series resistor of the sensor circuitry it is
Based on the current and the illuminance the output voltage of the sensor circuitry can be
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:
42053B 02/2015 The reference to document AVR1940 has been renamed to AT01639. Hyperlink to the
6.2 Revision History of the Kit
To identify the revision of the Atmel AVR XMEGA-C3 Xplained 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 “A09-1607/2” can be resolved to
ID=A09-1607 and revision=2.
6.2.1 Revision 2
Revision 2 of the XMEGA-C3 Xplained kit is the initially released version. This revision of the kit has the following
product ID: A09-1607/2.
Atmel®, Atmel logo and combinations thereof, AVR®, Enabling Unlimited Possibilities®, QTouch®, XMEGA®, and others are registered trademarks or trademarks of
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