Atmel AVR1925: XMEGA-C3 Xplained Hardware User's Guide
Contents
1. Header J2 microSD card connector Header J4 Temperature sensor Light sensor 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 AVR1940 XMEGA C3 Xplained Software User Guide 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 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 possible2. 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 AVR1925 XMEGA C3 Xplained Hardware User s Guide APPLICATION NOTE 14 42053A AVR 02 2013 Atmel Enabling Unlimited Possibilities Atmel Corporation Atmel Asia Limited Atmel Munich GmbH Atmel Japan G K 1600 Technology Drive Unit 01 5 amp 16 19F Business Campus 16F Shin Osaki Kangyo Building San Jose CA 95110 BEA Tower Millennium City 5 Parkring 4 1 6 4 Osaki USA 418 Kwun Tong Road D 85748 Garching b Munich Shinagawa ku Tokyo 141 0032 Tel 1 408 441 0311 Kwun Tong Kowloon GERMANY JAPAN Fax 1 408 487 2600 HONG KONG Tel 49 89 31970 0 Tel 81 3 6417 0300 www atmel com Tel 852 2245 6100 Fax 49 89 3194621 Fax 81 3 6417 0370 Fax 852 2722 1369 2013 Atmel Corporation All rights reserved Rev 42053A AVR 02 2013 Atmel Atmel logo and combinations thereof AVR Enabling Unlimited Possibilities QTouch XMEGA and others are registered trademarks or trademarks of Atmel Corporation or its subsidiaries Windows is a registered trademark of Microsoft Corporation in U S and or other countries Other terms and product names may be trademarks of others Disclaimer The information in this document is provided in connection with Atmel products No license express or implied by estoppel or otherwise to any intellectual property right is granted by this
3. document or in connection with the sale of Atmel products EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR NON INFRINGEMENT IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT INDIRECT CONSEQUENTIAL PUNITIVE SPECIAL OR INCIDENTAL DAMAGES INCLUDING WITHOUT LIMITATION DAMAGES FOR LOSS AND PROFITS BUSINESS INTERRUPTION OR LOSS OF INFORMATION ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and products descriptions at any time without notice Atmel does not make any commitment to update the information contained herein Unless specifically provided otherwise Atmel products are not suitable for and shall not be used in automotive applications Atmel products are not intended authorized or warranted for use as components in applications intended to support or sustain life
4. part details are shown in Table 4 6 more information can be obtained from the manufacturer s website Table 4 6 NTC characteristics Global part number NCP18WF104J03RB Resistance 25 C 100kQ 5 B Constant 25 50 C reference value 4250K 2 B Constant 25 80 C reference value 4303K B Constant 25 85 C reference value 4311K B Constant 25 100 C reference value 4334K Table 4 7 shows the temperature vs resistance characteristic The values are available from Murata in the datasheet of the NTC Atmel Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide APPLICATION NOTE 9 42053A AVR 02 2013 Table 4 7 Resistance vs temperature from Murata Temp NTC resistance Temp NTC resistance Temp NTC resistance C kQ C kQ C kQ 0 Temp NTC resistance C kQ 60 30 2197 225 357 012 30 79 222 22 224 29 2055 558 1 338 006 31 75 675 61 21 374 28 1923 932 2 320 122 32 72 306 62 20 561 27 1801 573 3 303 287 33 69 104 63 19 782 26 1687 773 4 287 434 34 66 061 64 19 036 25 1581 881 5 272 500 35 63 167 65 18 323 24 1483 100 6 258 426 36 60 415 66 17 640 23 1391 113 7 245 160 37 57 797 67 16 986 22 1305 413 8 232 649 38 55 306 68 16 360 21 1225 531 9 220 847 39 52 934 69 15 760 20 1151 037 10 209 710 40 50 677 70 15 184 19 1081 535 11 199 196 41 48 528 71 14 631 18 1016 661 12 189 268 42 46 482 72 14 101 17 956 080 13 179 890 43 44 533 73 13 592 16 899 481 14 171 028 44
5. 42 675 74 13 104 15 846 579 15 162 651 45 40 904 15 12 635 14 797 111 16 154 726 46 39 213 76 12 187 13 750 834 17 147 232 47 37 601 77 11 757 12 707 524 18 140 142 48 36 063 78 11 344 11 666 972 19 133 432 49 34 595 79 10 947 10 628 988 20 127 080 50 33 195 80 10 566 9 593 342 21 121 066 51 31 859 81 10 200 8 559 931 22 115 368 52 30 584 82 9 848 7 528 602 23 109 970 53 29 366 83 9 510 6 499 212 24 104 852 54 28 203 84 9 185 5 471 632 25 100 000 55 27 091 85 8 873 4 445 772 26 95 398 56 26 028 86 8 572 3 421 480 27 91 032 57 25 013 87 8 283 2 398 652 28 86 889 58 24 042 88 8 006 1 377 193 29 82 956 59 23 113 89 7 738 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 ADC input V Temp C ADC codes ADC input V Temp C ADC codes 38 345 2 076 14 2047 0 347 2 030 13 2014 0 334 39 332 1 983 12 1968 0 321 40 319 1 936 11 1921 0 309 41 307 1 889 10 1875 0 297 42 295 1 841 9 1828 0 286 43 283 Atmel Atmel AVR1925 XMEG
6. A C3 Xplained Hardware User s Guide APPLICATION NOTE 10 42053A AVR 02 2013 Temp C ADC codes ADC input V ADC input V Temp C ADC codes 44 273 1 794 8 1781 0 275 1 747 7 1734 0 264 45 262 1 700 6 1687 0 254 46 252 1 653 5 1640 0 244 47 243 1 606 4 1594 0 235 48 233 1 560 3 1548 0 226 49 225 1 514 2 1503 0 218 50 216 1 469 1 1458 0 209 51 208 1 425 0 1414 0 202 52 200 1 380 1 1370 0 194 53 193 1 337 2 1327 0 187 54 185 1 294 3 1285 0 180 55 178 1 252 4 1243 0 173 56 172 1 211 5 1202 0 167 57 165 1 171 6 1162 0 161 58 159 1 131 7 1123 0 155 59 154 1 093 8 1084 0 149 60 148 1 055 9 1047 0 144 61 142 1 018 10 1010 0 138 62 137 0 982 11 975 0 133 63 132 0 947 12 940 0 128 64 127 0 913 13 907 0 124 65 123 0 880 14 874 0 119 66 118 0 848 15 842 0 115 67 114 0 817 16 811 0 111 68 110 0 787 17 781 0 107 69 106 0 758 18 752 0 103 70 102 0 730 19 724 0 100 71 99 0 702 20 697 0 096 72 95 0 676 21 671 0 093 73 92 0 650 22 645 0 090 74 89 0 626 23 621 0 086 75 86 0 602 24 597 0 083 76 83 0 579 25 575 0 081 77 80 0 557 26 553 0 078 78 77 0 535 27 I 531 0 075 79 75 0 515 28 511 0 073 80 72 0 495 29 491 0 070 81 70 0 476 30 472 0 068 82 67 0 458 31 454 0 065 83 65 0 440 32 437 0 063 84 63 0 423 33 420 0 061 85 61 0 407 34 404 0 059 86 59 0 391 35 388 0 057 87 57 0 376 36 373 0 055 88 55 0 361 37 359 0 053 89 53 Atmel Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide APP
7. ICE mkll probe has to be used when connecting to the XMEGA C3 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 Pin on programming header PDI DATA VCC CLK GND Oak WN 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 2 shows how the Atmel AVR XMEGA is connected to the header Note When using TWI please 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 Please refer to the assembly drawing in the design documentation for the location of these footprints Table 3 2 Expansion header J1 Pin on J1 Name on J1 XMEGA pin Shared with onboard functionality __SDA _PCO Es 2 SCL PC1 E 3 RXD PC2 4 TXD PC3 5 SS PC4 6 MOSI PC5 E MISO PC6 8 SCK PC7 E 9 GND E 10 VCC P3V3 E E Atmel Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide APPLICATION NOTE 6 42053A AVR 02 2013 The header J2 is co
8. LICATION NOTE 11 42053A AVR 02 2013 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 900Ix 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 Symbols Description ICA Calibrated sensor responsivity at 100Ix This is 50pA according to the sensor datasheet Ev Illuminance l 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 7kO has been chosen in this design Illuminance is calculated based on the relation of the actual current through the sensor to the By 100 2 IEA calibrated value at 100Ix Since the ADC measures the voltage across the series resistor of the sensor circuitry it is I U R i necessary to calculate the voltage based on the current Based on the current and the illuminance the output voltage of the sensor circuitry can be U EvxRxICA 100 C Table 4 10 Illuminance vs ADC input voltage iuminanee lux ADC input V1 Fiuminance 1 0 0024 Dusk 10 0 0235 Dusk 20 0 0470 Dusk 30 0 0705 Dusk 40 0 0940 Dus
9. 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 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 AVR1940 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 BatchlSP 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 mkll AVR JTAGICE mkll is a mid range development tool for Atmel 8 and 32 bit AVR devices with on chip debugging for sou
10. endere rrr tn rrr ude dedero eda eco ueni need tn 6 3 2 JJ O expansiom headers ertet ttr tri tot neta rete be ute poer tri coat EF SENERE 6 4 Peripherals inniti iie reel e Di E Ra e re ida dead ad 8 4 1 micro9D Card eire ERE HERR ERAN NOH CER T 8 4 2 Atmel AVR QTouclrD fton ies t rtr erobern Eoi o naar 8 4 3 Mechanical DUttOiS ci roe toi repr exe eta Den EYE E ERE RUE EES EER ArU 8 Lv MEC 8 4 5 OLED display eie erede tee E re oe ERE HP bee bd dne die ib cur ene chs 9 LIMEN Is 9 4 6 1 Temperat re SMS Ol 9 4 6 2 Ambient light sensor eese nennen rnnt 12 5 Code examples ee 13 B Revision HIStory s osea cae nae incu Uo eee a ces eens 14 6 1 Revision history of the document ciere reete be eine dun 14 6 2 Revision history of the Kil teer rand pr Eripe perte aerae torri nex 14 6 2 1 up 14 Atmel Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide APPLICATION NOTE 2 42053A AVR 02 2013 1 Related items 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
11. k 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 Atmel Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide APPLICATION NOTE 12 42053A AVR 02 2013 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 AVR1940 XMEGA C3 Xplained Software Users Guide Atmel Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide APPLICATION NOTE 13 42053A AVR 02 2013 6 Revision history 6 1 Revision history of the document Doc Rev Date Comments 42053A 02 2013 Initial document release 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
12. nn eee Atmel APPLICATION NOTE Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide Atmel XMEGA C Features e Atmel AVR ATxmega384C3 microcontroller e OLED display with 128x32 pixels resolution e Analog sensors e Ambient light sensor e Temperature sensor e Analog filter e Digital I O e Two mechanical buttons e Two user LEDs one power LED and one status LED e Four expansion headers e Touch e Two Atmel AVR QTouch button e Memory e 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 user to get started using XMEGA peripherals right away and understand how to integrate the XMEGA device in their own design Figure1 XMEGA C3 Xplained evaluation kit j BRETT 42053A AVR 02 2013 Table of Contents 1 Related items 0 ccc cecseeecseeeseee ence eeeee ee eeeeeeeeeeeeeeeeeeeseeeseesseeseeeees 3 2 General information satissaitesiventtatscandiacnsiiavrceasaedranisadganantiatiaiagmaiaaabiiaans 4 2 1 PRE PFOGFAM MEG TIMMWANE scios neninn eiei een bebe dere pese e esasboccedsianneesd 4 2 2 Power SUPPLY EE 4 2 3 Measuring the Atmel AVR XMEGA power consumption scese 4 2 4 Programming the Kit careret eee e tbe EAR e Lone eee enne ina 5 Bx Connectors cedet d get eds tt om ode Peto 6 39 1 Programming headers u
13. nnected to analog ports of the XMEGA as shown in Table 3 3 Table 3 3 Expansion header J2 Pin on J2 Name on J2 XMEGA pin Shared with onboard functionality 1 ADCO PBO e 2 ADC1 PB1 3 ADC2 PB2 4 ADC3 PB3 5 ADC4 PB4 6 ADC5 PB5 7 ADC6 PB6 gt 8 ADC7 PB7 9 GND 10 VCC_P3V3 The header J3 is connected to digital ports of XMEGA Table 3 4 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 onboard functionality 1 PAO PAO Light sensor 2 PA1 PA1 Temperature sensor m 3 PA2 PA2 Filter output 4 PA3 PA3 Display reset 5 PA4 PA4 6 PA5 PA5 7 PA6 PA6 8 PA7 PA7 9 GND 10 VCC P5VO 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 Pin on J4 Name on J4 XMEGA pin Shared with onboard functionality 1 SDA PEO 2 SCL RE 3 RXD PE2 4 TXD PE3 5 Ss PDO Display data and command select 1 6 MOSI PD3 Display and microSD card MOSI 7 MISO PD2 microSD card MISO 8 SCK PD1 Display and microSD card clock input 9 GND 10 VCC P3V3 Note 1 Can be disconnected from onboard functionali
14. rce 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 Atmel Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide APPLICATION NOTE 3 42053A AVR 02 2013 2 1 2 2 2 3 General information 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 Power measurement header 32kHz crystal Power amp status LEDs Header J1 PDI header USB connector Header J3 Mechanical QTouch buttonO buttonO OLED display RR RANA x o ooo ceo lll QTouch button1 Mechanical button1 3 MBA
15. rned 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 Atmel Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide APPLICATION NOTE 8 42053A AVR 02 2013 Table 4 4 LED connections Pin on XMEGA PRO Yellow LEDO PR1 Yellow LED1 PD4 Red status LED PD5 Green power indicator LED 45 OLED display The OLED display on the XMEGA C3 Xplained board is UG 2832HSWEG04 which comes from WiseChip Semiconductor Inc It has a resolution of 128 x 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 Pin on XMEGA JN PDO Data command PD1 SCK PD3 MOSI PF3 ss PA3 RESET 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
16. to determine the current consumption To locate the power measurement header please refer to Figure 2 1 Atmel Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide APPLICATION NOTE 4 42053A AVR 02 2013 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 24 Programming the kit The kit can be programmed either from an external programming tool or through an USB boot loader which is pre programmed on the device The boot loader is evoked by pushing the push button SWO 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 Atmel Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide APPLICATION NOTE 5 42053A AVR 02 2013 3 1 3 2 Connectors 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 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 JTAG
17. ty by cut strap J204 AtmeL Atmel AVR1925 XMEGA C3 Xplained Hardware User s Guide APPLICATION NOTE 42053A AVR 02 2013 4 1 4 2 4 3 4 4 Peripherals microSD card The Atmel AVR XMEGA C3 Xplained has a microSD card standard connector mounted The SWA is used for detecting the microSD card When a misroSD 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 PD1 SCK PD3 MOSI PD2 MISO PE5 ss PE4 SWA 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 Pin on XMEGA QButton PF4 SNSO m PF5 SNSKO PF6 NS1 PF7 SNSK1 l 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 Pin on XMEGA Silkscreen text on PCB E PF1 SWO PF2 sw LEDs There are four LEDs available on the board that can be tu
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