A20-OLINUXINO-LIME and A20-OLINUXINO-LIME-4GB
Contents
1. 131 ll 18nF 50 SU E SATA k 6 2 x There is 5 SATA connector that is CON2DLI02 suitable for powering 5V hard disks trough the board To keep the low form factor we have placed the small JST connector ae You can make an adapter cable accordingly The other options is to check the SATA CABLE SET 7 that we have available For more information please visit https www olimex com Products Components Cables S ATA CABLE SET Pay note the two jumpers 5V E SATA and PC3 PB located at the bottom of the board under the HDMI connector The first one 5V E SATA is open by default because the board has software control of the powering for the hard disk If you close 5 SATA there would always be 5V at the 5V SATA PWR connector Which pin does the software control of the SATA powering is determined by the position of the PC3 PB8 jumper By default is used Page 29 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 6 9 GPIO 1 General Purpose Input Output 40pin connector The GPIO 1 connector has 40 pins Note that the connector has 0 05 50 mil step between pins Olimex also sells a compatible extension cable for the connector named CABLE 40 40 10CM IMPORTANT the cables and the 0 05 connectors are very fragile if you attempt to disconnect the setup by pulling the cable it might break Fur2. C118 117 10uF 6 3U ERSS usB_a_ueRTICAL 100nF 50 U11 576280 L8 USB HOST2 FB0805 600R 2 LEANN FB8805 600R 2 1800nF There two USB host connector featured on the board They are called USB_HOST1 and USB_HOST2 Each of them has own connector both situated near the Ethernet connector Each of connector has own low loss power distribution switch SY6280 which protects the board in case the devices you have plugged to the board try to draw more current than 523mA combined The maximum current available on each of the USB hosts is exactly 523mA The SY6280 responsible for the USB_HOST1 is enabled by USB0 DRV1 processor pin A4 The SY6280 responsible for the USB_HOST2 is enabled by USB0 DRV2 processor pin A5 USB_HOST connectors USB HOST Signal Processor pin _ USB_HosT2 signal Processor pin sv Connected to in ei connected to 57628 GN wm jme om po um pa iem o mo pe o Ll The GND is common for both levels of the USB HOST 6 6 Ethernet The LIME board is equipped with a standard RJ45 Ethernet connector at the top of the board that allows you to access local network via an Ethernet cable The LAN connectivity is handled by Realtek s RTL8201CP Some of the features of this 10 100Mbit c
3. 2 C76 3 300 ee 22uF 6 3U 3 300 MII SNIB TPTX i TPTX NC TPRX u 3 3uO RESETB TPRX 1 3 30 5 E R22 KG a RTL8201CP E 560R m EPHY RST amp co 825 KY T R 1286 4X0603 488 51R 5606 2 2 6 i 8 C87 C88 Teo F T LAN RJLBC 6 TC1_GND_MILLING Page 27 of 42 OLIMEXO 2014 6 7 HDMI connector A20 OLinuXino LIME user s manual The part of the schematic that describes the HDMI module is shown below HTX2P HTX2 HTXAP HTX4 HTX P HTX N HTXCP HTXCN HCEC lt R309 2kZ1 HscL_ 9U HSD IN4 OUT4 GND GND R31 2k71 c Snbaso HDMI SWM 19 NACRCLAMP 524P gt R32 47 1 Note that there are different Linux images depending whether the HDMI TV works at 50Hz or 60Hz refresh rate If you board runs Android there is a specific option to set the appropriate HDMI output HTXCN HCEC HSCL HSDA HHPD Pin 14 of the HDMI is not mandatory In HDMI 1 0 1 3c it is reserved pin in HDMI 1 4 it is optional Page 28 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 6 8 SATA connector and power The part of the schematic describing the SATA module is shown below CREME MLN a EN SATA TXM_ 128 ll 18nF 129 10nF Ej E
4. A20 OLINUXINO LIME and A20 OLINUXINO LIME AGB Open source sinole board Android Linux mini computer USER S MANUAL Revision A August 2014 Designed by OLIMEX Ltd 2014 lead free boards produced by Olimex LTD are ROHS compliant OLIMEXO 2014 A20 OLinuXino LIME user s manual DISCLAIMER 2014 Olimex Ltd Olimex logo and combinations thereof are registered trademarks of Olimex Ltd Other product names may be trademarks of others and the rights belong to their respective owners The information in this document is provided in connection with Olimex products No license express or implied or otherwise to any intellectual property right is granted by this document or in connection with the sale of Olimex products This work is licensed under the Creative Commons Attribution ShareAlike 3 0 Unported License To view a copy of this license visit http www creativecommons org licenses by sa 3 0 This hardware design by Olimex LTD is licensed under a Creative Commons Attribution ShareAlike 3 0 Unported License The software is released under GPL It is possible that the pictures in this manual differ from the latest revision of the board The product described in this document is subject to continuous development and improvements All particulars of the product and its use contained in this document are given by OLIMEX in good faith However all warranties implied or expressed including but not limited to implied warra
5. OLIMEXO 2014 A20 OLinuXino LIME user s manual You are more than welcome to send or share your suggestions and ideas at our e mail the public forums or irc channel We would attempt to help in almost every case We listen to the feedback and if the majority of users suggest a software change or update we try to implement such Customer feedback is very important for the overall state of the software support However do not expect full Linux or Android software support We can share our experience We can give you full details for things we have tried We can point you to a resource or a guide We can give you general directions to solving a specific problem or places to look for more information However we won t install a piece of software for you or write custom program for you We won t provide a specific software solution to a specific software problem Page 14 of 42 OLIMEX 2014 A20 OLinuXino LIME user s manual CHAPTER 3 A20 OLINUXINO LIME BOARD DESCRIPTION 3 Introduction to the chapter Here you get acquainted with the main parts of the board Note the names used on the board might differ from the names used below to describe them For the actual names check the A20 OLinuXino LIME board itself 3 1 Layout top view The picture below shows the top side of the board and highlights the most important parts RAM MEMORY CASE MOUNT 4 LCD DISPLAY 512 MB POWER LED POWER SUPPLY 5V ONLY LIPO battery connector Char
6. This might be problem in the first start up to users counting only on SSH connection You can enable the Ethernet after a successful boot up with ifconfing a dhclient eth as seen after after the ifconfing command Important You can configure static DHCP given IP addresses in etc network interfaces Page 26 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual thernet E 6 Y TXDO 0033 MOU 2 nor cst L Los EEPROM 2 T 22 F76 3U EOS 3 aono pub ZENEN mE 16 Kbit L L2 cce oO 2048 x 8 I ERXD 24 FS0905 600R 2N 3 3U ERXD1 56 2x08 DUDD33 3 3U RXDL C62 ERNE 18 RX02 T T22uF7e 3U ERXD3 18 m uF 6 GR ae 16 pxc DGND NAC2 2k RXER FXEN 23 xt pF jes l n 33pF EMDIO t 26 4SB25 000F 20E15 5x3 2mm 20ppm 20pF RM1G1 3 30 3 30 O RA1206_ 4X0603 _4B8_4 7k LEDO PHYADO e RM261 281206 4X0603 4B8 4 7k ECRS 23 RM2G2 1 2 ECOL 1 as ahus RM263 satz s RM2G4 281205 4BB 4 7k R19 2k 1 28 ROMA T aris Eois censa di i 3 3U C2Z4 t L3 aonr 275 l RPTR PLFBOUT 5
7. 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual dust and accidental short circuits USB SERIAL CABLE F for Android Linux debugging UARTO Additional items include Small heatsink for the processor during long video playbacks the A20 processor might heat up External 2 5 SATA hard disk drive proper cables sold Ethernet cable for wired Ethernet A10 OlinuXino LIME UEXT CABLE IDC40 15cm and CABLE 40 40 10CM an adapter board and two cables suitable for Olimex LCD connection Important note on requirements The board works with 2 5 SATA hard disks that can be powered by 5V source from the board For the 3 5 hard disks you would probably need to provide external 12V supply It is a very good idea to have a USB SERIAL CABLE or similar cable since it allows you to 1 Change display output settings for Debian easily 2 Debug the board via any personal computer even if there are problems with the video output Some of the above suggested items can be purchased by Olimex for instance SY0605E reliable power supply adapter 50Hz for EU 5V 1A for A20 OLinuXino LIME SY0605E CHINA cheaper power supply adapter 50Hz for EU 5V 1A for A20 OLinuXino LIME A20 LIME ANDROID SD a tested class 10 micro SD card with the latest by the time of leaving the Olimex facilities official Android release A20 LIME DEBIAN SD a tested class 10 micro SD card with the latest by the time of leaving Olimex facilities offici
8. 720p 60Hz If you want to change some other LCD VGA or HDMI resolution then you have to start script file in root directory If the problem is under Debian Linux make sure you are properly logged in the XFCE interface Else applying calibration would not happen for the current user if you are calibrating from the X graphical interface make sure that you are logged as user olimex if calibrating without the X the user 15 root su olimex enter the password olimex calibrate the touch screen and reboot the board sudo reboot 2 6 Software support We maintain Linux and Android images for SD card which might be downloaded for free and modified as the user wishes The latest images and updates are featured at the wiki article of the device https www olimex com wiki A20 OLinuXino LIME We usually try to provide details on how to build the Linux and the Android images at our wordpress page http olimex wordpress com Another useful place is the Olimex forums where a lot of people share their experience and advice https www olimex com forum Additional Android and Linux support and features are added overtime The Linux support is a work in progress and you should not expect full Linux support after the initial volume of such boards have become available on the market If you are in a hurry consider the older OLinuXino designs which have almost everything supported have examples available and so on Page 13 of 42
9. Product support For product support hardware information and error reports mail to support olimex com All document or hardware feedback is welcome Note that we are primarily a hardware company and our software support is limited Please consider reading the paragraph below about the warranty of Olimex products All goods are checked before they are sent out In the unlikely event that goods are faulty they must be returned to OLIMEX at the address listed on your order invoice OLIMEX will not accept goods that have clearly been used more than the amount needed to evaluate their functionality If the goods are found to be in working condition and the lack of functionality is a result of lack of knowledge on the customers part no refund will be made but the goods will be returned to the user at their expense All returns must be authorized by an RMA Number Email support olimex com for authorization number before shipping back any merchandise Please include your name phone number and order number in your email request Returns for any unaffected development board programmer tools and cables permitted within 7 days from the date of receipt of merchandise After such time all sales are considered final Returns of incorrect ordered items are allowed subject to a 10 restocking fee What is unaffected If you hooked it to power you affected it To be clear this includes items that have been soldered to or have had thei
10. The board should be turned off either by the standard OS menu or poweroff command or and after the choice is confirmed it is safe to be disconnected from the power supply unit 5 2 Clocks 25 MHz quartz crystal Q1 is connected to pins X1 and X2 of the RTL8201CP Ethernet controller 32 768 Hz RTC quartz crystal Q2 is found at pins F1 and F2 of the A20 microcontroller 24 MHz quartz crystal Q3 is found at pins N22 and N23 of the A20 microcontroller 5 3 Power supply circuit The power supply is handled mainly by AXP209 power management system an Allwinner chip that goes together with the A20 processor It is mounted on the board but since it is relatively hard to find we also sell it separately The power supply circuit of A20 OLinuXino LIME requires input supply of 5V The minimum wattage is 2 5W and this threshold may raise if using a lot of devices on the USB HOST via external hub a lot of GPIOs or you have a display connected to the LCD CON or a hard disk powered from the 5SV SATA connector If a discharged Li Po battery is connected to the respective connector the power consumption of the whole LIME board might rise enormously since the built in battery charger would attempt to recharge it Page 19 of 42 OLIMEX 2014 A20 OLinuXino LIME user s manual CHAPTER 6 CONNECTORS AND PINOUT 6 Introduction to the chapter In this chapter are presented the connectors that can be found on the board all together with their p
11. To repair the image on NAND re upload it following these easy steps 1 Install and run PhoenixSuit can be found in the wiki article of the board 2 Go to firmware tab of the program and point to a valid Android image the latest official one may also be downloaded from the wiki article 3 Disconnect the power supply and USB cable from the A20 board 4 Press and hold RECOVERY button apply power supply 5V release RECOVERY button 5 Connect USB cable to the mini USB connector Page 23 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 6 You will be asked for drivers for the bootloader Navigate to the folder where you extracted the PhoenixSuit and install the drivers from the respective executables or manually point the installer to the drivers folder in the PhoenixSuit installation path 7 PhoenixSuit will detect the board and would ask for the method of writing the image Choose method of writing the image and confirm your wish to write the image 8 Wait till upgrade succeeds as shown below En Firmware PhoenixSuit QU Upgrade Firmware Succeed Caution Please Check the Device Power Before Upgrade Do not Unplug Device during the Upgrade Procedure Page 24 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 6 5 USB_HOST connectors The part of the schematic related to the USB_HOST connectors is listed below USB HOSTs USB_HOST4 4 U10 SY6280 L7 FB0805 600R 2R
12. is defined as a port suitable for serial debug You can use our USB SERIAL CABLE F for debugging UEXT1 and UEXT2 NOT defined by default Consider table below when connecting the USB SERIAL CABLE F according to the wire color code The RX line of the cable GREEN wire should go to TX line of the target board the TX line of the cable RED wire should go to the RX line of the target board The BLUE wire should go to the target s GND line UARTO Page 20 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 6 2 MicroSD card connector The micro SD card slot is primarily used for booting the operating system The board works with micro SDHC cards up to 32GB of storage Asa general precaution be careful with the SD cards you purchase There is a big percentage of fake cards due to the low effort required to counterfeit popular brands and the big demand for SD cards worldwide When in doubt try the same operation with another card from another brand Olimex sells microSD cards with Linux or Android images that have been tested please refer to chapter 2 2 Requirements Of course if you already have a large enough microSD card you can download the official Linux image from the wiki pages https www olimex com wiki A20 OLinuXino LIME When removing the card please make sure that you release it from the connector by pushing and NOT by pulling the card directly this can damage both the connector and the micro
13. is to use the LCD_CON row of pins Note that unlike other OLinuXino boards the row of pins on A20 OLinuXino LIME that allows the user to connect a display has a small step 0 05 The corresponding connectors in previous OLinuXino boards and displays have a step of 0 1 This means that if you use a display made by OLIMEX you would need additional hardware to adapt the pin step accordingly You can either make such adapter or cable yourself following the schematics of the display and the board or purchase it from us You would need two 40 pin cables CABLE 40 40 10CM and CABLE IDC40 15cm that connect to a small adapter board called A20 OLinuXino LIME UEXT I recommend you to take a look at Page 12 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual the pages of the adapter and the cables even if you decide to make it yourself there are schematics available for download 2 5 1 Android calibration Calibrating a display under Android is pretty straightforward from the Android application Important initially the boards are calibrated for a specific display and resolution If you re write the image no matter whether the SD card or the NAND memory you might need to use a mouse to calibrate the display initially It might be impossible to calibrate it via touching the display 2 5 2 Debian calibration The command that allows calibrating in Debian Linux is ts_calibrate The default Debian setup is made with settings for HDMI
14. jue ju 38 poms Ene a jun a as emp E E Jus js 3 E p je S 39 Jes 8 j Signals marked with are multiplexed with either a peripheral device or another connector Ensure that the multiplexing is handled properly on software and or hardware level else there would probably occur wrong levels loss of data etc Page 31 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 6 11 GPIO 3 General Purpose Input Output 40pin connector is n pua 2 Jj je 2 pus o p m pus pp 3 m peeo b a jJ j s pm bw kW 37 pe s po e 6 12 GPIO 4 General Purpose Input Output 20pin connector GPIO 4 connector features the rest of the signals available and few additional signals that might need testing Ca o2 k wes e a he s vm je 7 wm s je s vm jaz Jn Lu mn asme jom as n e jaz js Signals marked with are multiplexed with either a peripheral device or another connector Ensure that the multiplexing is handled properly on software and or hardware level else there would probably occur wrong levels loss of data etc Page 32 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 6 13 LCD_CON 40pin connector The LCD_CON pins are led out on a separate 40pin con
15. 9 30 6 12 GPIO 4 General Purpose Input Output 20pin connecctotr 32 6 13 LCD CON 30 33 CHAPTER 7 SCHEMATICS u uuu usus ERR Ia 36 7 Introduction to chapte irris uuu aus Suwisa isuwa 36 CHAPTER 8 REVISION HISTORY AND 5 38 8 Introduction to the chapteF u sassa ss sssssssassssssssssssssssssassssssssssacsaqssse ass 38 8 1 DOCUMENT VEVISION 9000016 20 2 0056 esas o ERU Es edv oo Rag 38 8 2 Board POVISIOMN uuu luu 2 20 0 0200222 20 02 0 0 900 9 002 VP Ta Dag v vUa S Fe ca Uso 38 Page 4 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual CHAPTER 1 OVERVIEW 1 Introduction to the chapter Thank you for choosing this OLinuXino single board computer from Olimex This document provides user s guide for the Olimex A20 LIME board As an overview this chapter gives the scope of this document and lists the board s features The document s organization is then detailed The A20 OLinuXino LIME development board enables code development of applications running on the A20 microcontroller manufactured by Allwinner Technology from China OLinuXino is an open source open hardware project and all documentation is availa
16. B Page 2 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual Table of Contents DISCDEAIMER RR a qasaqusasqsasasuqaasqys qshivasesuscssssusssupssasisswssqs 2 CHAPTER 1 OVERVIEW cracina 5 1 Introduction to the chapter aissa u 2 S GG s aaa 5 fi Ed u u u 5 1 2 Target market and purpose of the 5 1 3 Board 6 1 4 Board version used in the manuall ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssccesseees 6 L5 Document Org AUR AON ss asco idc iR A sas cia ADR Co Dou Fed 6 CHAPTER 2 SETTING UP THE OLINUXINO 8 2 Introduction to the Chapter ccccccsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssseses 8 CHAPTER 6 CONNECTORS AND 20 6 Introduction to the chapter iiie span passo aa etus eaa pasaba sassa qasusqa ask 20 Page 3 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 6 2058 O IG qaqaq qasaqa kia qaqas k 6 5 VSB HOST Comme ct Ors uu uu 6 6 Eth eriet uu suu uuu s 2 ssassssasuasassssassssq usssssshusssssssukasssssusssssasusassishussasssaskasssquskussssqa aqu ussssaaesa 22 25 25 28 2
17. D interface Supports CVBS YPbPr VGA Integrated TV decoder m CAMERA Integrated parallel 8 bit I F YUV sensor Integrated 24 bit parallel YUV 444 I F Supports 5M CMOS sensor Supports dual sensors MEMORY m DDR2 DDR3 DDR3L controller NAND Flash controller with 64 bit ECC m AUDIO W Integrated HI FI 100dB Audio Codec m Dual analog mic amplifiers Page 17 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual More information can be found on Allwinner s web site at the following web address http www allwinnertech com en product A20 html A good source of information on the processor is the linux sunxi wiki article http linux sunxi org A20 4 2 Block diagram The block diagram is taken from Allwinner s web site u A ARM Cortex A7 on Security Syste ARM CORGEEAT User Interface GPU ARM Mali400 ARM Mali400 Connectivity System USB OTG 2 USB HOST _GMAC EMAC SD MMC_ Thumb 2 FPU NEON SIMD Display Interface _ CPU RGBICD Page 18 of 42 Audio Interface Video Engine Display Engine TV Decoder TV Encoder OLIMEXO 2014 A20 OLinuXino LIME user s manual CHAPTER 5 CONTROL CIRCUITY 5 Introduction to the chapter Here you can find information about reset circuit and quartz crystals locations the power supply circuit is also briefly discussed 5 1 Reset The board has hardware reset controlled by the AXP209 power system management IC
18. IB W dll All dimensions are in mills 3305 Page 37 of 42 OLIMEX 2014 A20 OLinuXino LIME user s manual CHAPTER S REVISION HISTORY AND SUPPORT 8 Introduction to the chapter In this chapter you will find the current and the previous version of the document you are reading Also the web page for your device is listed Be sure to check it after a purchase for the latest available updates and examples S 1 Document revision Document revision changes page A 28 08 14 Initial manual release A11 S 2 Board revision Remember to check the schematics and the board design files to compare the differences pesa release of the board Page 38 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 8 3 Useful web links and purchase codes The web page you can visit for more information about your device are Product page https www olimex com Products OLinuXino A20 A20 OLinuXino LIME Wiki article of the board https www olimex com wiki A20 OLinuXino LIME A place for general questions FAQ or friendly talk https www olimex com forum You can get the latest updates on the software at https github com OLIMEX OLINUXINO You may may join our IRC channel olimex freenode net http webchat freenode net channels olimex The sunxi community is behind the Allwinner Linux support http linux sunxi org Main Page ORDER CODES A20 OLinuXino LIME the product for which this manual is abou
19. O 2014 A20 OLinuXino LIME user s manual Linux and Android gadget fans they can just use the board as a media center or fully functional Linux PC for instance and also professionals since its low cost makes it very good solution for application orientated embedded systems The main usage of the board is software embedded development without the urge of understanding perfectly the hardware The LIME boards are a special kind of OLinuXino boards they are as small as possible while maintaining a remarkable stand alone functionality The strong points of these boards are the processor speed the small form factor and the low price to productivity ratio Customers have full access to the technical documentation of the board The software is released under General Purpose License and the board is considered open hardware all schematics and board design files are available to the customer under the Creative Commons Attribution ShareAlike 3 0 Unported License 1 3 Board variants There are two major board variants named A20 OLinuXino LIME and A20 OLinuXino LIME 4GB The 4GB version has a built in NAND memory that allows the storage of an operating system without the need of a SD card The 4 version comes with already programmed Android image The A10 OLinuXino LIME and A10 OLinuXino LIME 4GB boards are almost identical to respectively A20 OLinuXino LIME and A20 OLinuXino LIME 4GB with the only difference being the processor mounted T
20. SD card 6 2 1 SD MMC1 slot The schematic related to the SD MMC1 microSD connector is shown below 3 3U 1 MicroSD R26 1 00k 17 500 03 SD MMC1 cse qpzu eso co para cs E CMD DI T C88 p22uF76 3U Mes UDD _SD CLK CLK SCLK I DAT1 RES 14 DAT2 RES CL47 nH 8 5 1 76R 258mA O RM464 SD DET 228 10k MICRO_SD MMC_CP_NEWTFC WPAPR 8 SD MMC1 slot is the microSD card slot located on the top of the board This slot is typically used for booting the OS due to the larger capacities of the microSD cards compared to SD or MMC cards It is suggested to have an SD card with a proper Linux Android image especially if you have ordered a version of the board without NAND memory It is also recommended to use Class 10 1OMByte sec card for faster read write operations lower class cards especially higher capacity ones might slow down the whole system SD MMC1 connector Pin signal name Wire name processor pin 1 DAT2 RES SDO D2 K19 CD DAT3 CS SDO D3 K20 Page 21 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual Jom dp S CLK SCLK SDO CLK L20 DAT DO SDO DO M19 8 DAT1 RES SDO D1 M20 Additionally there are the WP and CP switches that are responsible respectively for sensing whether the card is locked for read
21. V processor pin C12 port B9 thus the USB is also controlled by the same signal Please note that the USBO DRV pin C12 port B9 is multiplexed with the 125 DO1 signal If you are going to use the I2S audio interface then you would probably need to change the position of the SMT jumper PB9 PH7 USB which by default connects USB to the PB9 This operation would require cutting between the pads of the default position with a very sharp object and then soldering the pads of the other position together Doing so you would be able to use both the USB OTG via port PH7 this time and the I2S interface Additionally PB9 PH7 GPIO jumper controls which of the two ports PB9 or PH7 should be lead out to pin 9 of GPIO3 connector for easier access By default this jumper is in PH7 GPIO position and PH7 is lead to pin 9 of GPIO3 USB OTG connector 45V OTG PWR UDMO USB IDDET GND The connector case is also grounded We have configured an Android image with settings suitable for A20 OLinuXino LIME Then using PhoenixSuit tools we uploaded the image to the board via the USB OTG The image is available for users to try and tweak the settings The images can be downloaded from the wiki article at https www olimex com wiki A20 OLinuXino LIME The board variant without NAND needs an SD card with bootable OS Android or Linux There are ready images available for download at the above linked A20 wiki article
22. a etc IMPORTANT To use Android with display or resolution different than HDMI and 1024x600 default settings you need to upload new Android image to the board These images are available here https www olimex com wiki A20 OLinuXino LIME using an operating system NAND flash In Debian Linux you would need to start a start a shell script to change the built in the image resolution settings Start it with change display 20 lime sh and follow the instructions Please Page 33 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual refer to chapter 2 5 Changing the default image resolution for more information 6 14 Jumper description Please note that most the jumpers on the board are SMT type If you feel insecure of your soldering cutting technique it is better not to try to adjust the jumpers since it is possible to damage the board Board jumpers SMT SMT SMT MT Either CLOSED or Controls whether the NAND memory OPEN depending module is enabled or disabled whether the board has 4GB If the jumper is closed than the MEMORY MODULE NAND memory is operational Controls which processor pin should be used for SATA power enabling signal By default the SATA powering control uses processor pin L22 which is port PC3 Changing this jumper also changes PC3 the availability of PC3 and 8 at GPIO 1 pin 29 and GPIO 3 pin 16 Please note that if you change the position of the jumper from PC3 to PB8 the
23. al Debian Linux release USB SERIAL CABLE F female USB serial console cable USB MINI CABLE standard USB type A to USB type mini cable A10 OLINUXINO LIME UEXT GPIO adapter which makes LIME GPIOs available in breadboard friendly 0 1 step connectors needed if you want to connect an Olimex made display to the board CABLE 40 40 10CM extension cable suitable for the GPIO and LCD CON headers A13 LCD43TS low cost 4 3 LCD display with touchscreen component 480x272 A13 LCD7 low cost 7 LCD display with optional touchscreen component 800x480 A13 LCD10 low cost 10 LCD display with optional touchscreen component 1024x600 A20 LCD15 6 low cost 15 6 LCD display 1366x768 CABLE IDC40 15cm cable for LCD to LCD CON connection SATA HDD 2 5 500GB 5GB 2 5 SATA hard disk SATA CABLE SET cables that allow the connection of a 2 5 hard disk to the board ALUMINIUM HEATSINK 20x20x6MM heatsink radiator for better processor heat dissipation Note that some of the items above carry the A10 name but are suitable for use with the A20 design due to the boards similarity Page 9 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 2 3 Powering the board There are three possible ways of powering A20 OLinuXino LIME via external supply providing 5V DC at the power jack from 5V USB port via USB_OTG connector or from 3 7V Li Po battery via the LIPO_BAT Note that the board might consume up to 650mA of current at 5V when ther
24. ble to the customer 1 1 Features The board has the following set of features Allwinner A20 dual core Cortex A7 processor each core typically running at 1GHz and dual core Mali 400 GPU 512MB DDR3 RAM memory 4GB NAND FLASH memory available only on the 4GB version of the board Android already loaded on the NAND available only on the 4GB version of the board SATA connector with 5V SATA power jack Built in FullHD support 1080p 2xUSB High speed host with power control and current limiter USB OTG with power control and current limiter HDMI output with ESD protectors 100MBit native Ethernet with connector Battery connector with battery charging capabilities LCD row of pins 0 05 step suitable for Olimex LCD displays via an adapter 160 GPIOs on four GPIO rows of pins 0 05 step MicroSD card connector DEBUG UART connector for console debug with USB SERIAL CABLE F GPIO LED Battery charge status LED 5V input power supply noise immune design Power LED 2KB EEPROM for MAC address storage and more 3 BUTTONS with ANDROID functionality RESET button 4 mount holes PCB dimensions 3005x2345 mils 76x59 mm 1 2 Target market and purpose of the board The boards from the OLinuXino family are easy to setup and powerful It is possible to use them in almost any application as a host board They are suitable for embedded programming enthusiasts Page 5 of 42 OLIMEX
25. ctor Page 35 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual CHAPTER 7 SCHEMATICS 7 Introduction to the chapter In this chapter is located information about the schematics describing logically and physically A20 OLinuXino LIME 7 1 Eagle schematic OLinuXino schematics may be found it on the OLinuXino s GitHub repository https github com OLIMEX OLINUXINO tree master HARDWARE You can download the whole repository as zip without having a GitHub account Please note that the schematics of A20 OlinuXino LIME and A10 OlinuXino LIME are similar and it is possible that a single board file and schematic for both boards exist We mostly use Eagle by Cad Soft 4 16r2 for designing However the files should be compatible with the latest Eagle available Cad Soft offers a trial version of their software that allows you to inspect schematics and board files without being able to modify them This work is licensed under the Creative Commons Attribution ShareAlike 3 0 Unported License To view a copy of this license visit http creativecommons org licenses by sa 3 0 If you are looking for a schematic of an older revision of the board and it isn t available at our web site you may request it by the support e mail Page 36 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 7 2 Physical dimensions Note that all dimensions are in mils TITITTTITTTTITTIITTITITI 4 m EEE m 0 LQFP48 o ooo 06000
26. d need an image suitable for the specific resolution Download locations to such images might be found at the wiki article for the A20 board here https www olimex com wiki A20 OLinuXino LIME For Linux Debian you would need to execute a shell script to be able to change the resolution It is very good idea to use a serial cable for connection to the board from a personal computer since in this case you are dependent on a video resolution a cable like USB SERIAL CABLE F When the board boots type change_display or change_display_A20_lime sh and choose the resolution and the interface LCD HDMI or VGA The supported resolutions are listed below Page 11 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual For LCD 1 4 3 480 272 2 7 800x480 3 10 1024x600 For HDMI 0 480i 1 576i 2 480p 3 576p 4 720p50 5 720p60 6 1080150 7 1080160 8 1080p24 9 1080p50 10 1080p60 For VGA note that the VGA signals are routed to custom 6 pin connector and you need to from adapter to standard VGA connector Olimex also sells such adapter cables 1680x1050 1440x900 1360x768 1280x1024 1024x768 800x600 640x480 1920x1080 1280x720 gt QO N 2 5 Connecting and calibrating a display One of the ways to interact with the board is via an external display with or without touchscreen component If you want to use a display for video output from the LIME board the best way
27. e are no peripherals connected to the USB hosts Make sure your power supply is able to provide at least 1A before Depending on your preferred way of powering you might need additional hardware Important Not all USB ports would be able to provide enough power for the board Try using another USB port USB hub or a cable of higher quality If you have an LCD display connected to the board or external 2 5 hard disk then the USB will NOT be sufficient source of power The best practice is to never count on the mini USB OTG as a single source of power for the board The preferred way of powering the board is via the PWR jack with 5V DC This would make the board fully powered and able to power all the peripherals connected to it Note that when powering the board from the USB_OTG the current provided might be insufficient to also power a bigger LCD connected to the LCD_con However this power option is capable of driving the board when using external display connected to the HDMI connector The typical consumption of A20 OLinuXino LIME is between 400mA and 750mA depending on the current load If the board has entered power down state you can bring it back without restart using the PWR_BUT The PWR_BUT is also used to start the board when powered from a Li Po battery on the battery connector Sometimes when starting Android it is possible the board to enter battery save mode even before booting fully Especially if you have turned off the b
28. ected between a PC and the board s DEBUG port In rare cases different polarity might cause hardware damage to the board 2 2 Requirements In order to set up the A20 OLinuXino LIME optimally one or more additional items may be used They might be generally placed in three categories Required items that are needed in order to achieve minimum functionality Recommended items that is good to have in order to be able to interact with the most important of the features of the board Additional items that provide access to additional features or expand the features of the board Required items USB type A to USB mini cable to connect to a personal computer used for powering the board and uploading new Android image to the NAND memory if your board has 4GB NAND Input device either a mouse keyboard or touchscreen LCD Output device either HDMI cable native HDMI monitor screen projector or USB SERIAL CABLE F personal computer for Linux and or Android debugging SD card with compatible image if you have the board version with NO additional NAND memory you will need it to use one of the images available Recommended items External USB hub to split the USB HOST mounted on the board you need that to connect more USB devices External power supply unit 5V DC 5W required for optimal power A10 OLinuXino LIME BOX an aesthetic box specially made for the board that protects it from Page 8 of
29. emory you can corrupt the image on the NAND memory 2 5 Changing the default image resolution Depending on the display or the screen you want to use with the A20 OlinuXino LIME you might need to apply software changes to the prebuilt Android or Linux image Generally this means that you would need to edit the configuration file script bin and edit the settings inside This file is usually located in Script bin can t be opened in the binary format so you would need to convert it to fex file format first There are ready to use tools that convert script bin lt gt script fex Note that script bin fex contains configuration settings and definitions not only for the video output but also for the pin descriptions and names power setting and much more If you really want to modify and customize the default images to change port functions port names to disable specific peripherals you would need to be able to edit the script files Please refer to the following web page for more information http linux sunxi org Fex Guide The typical OlinuXino user would not need to edit the files however To ease the process of changing the resolution we have compiled a number of Android images for the Android users with hard coded video output settings Alternatively for Debian Linux users we have provided a shell script that can be executed in order to set preferred video output and resolution For Android that you boot from the NAND memory you woul
30. ge LED NAND MEMORY USB_HOST2 USB_HOST1 LAN Ethernet GPIO 3 Allwinner A20 Debug port Page 15 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 3 2 Layout bottom view At the bottom are located mainly the buttons and microSD card connector POWER BUTTON RESET BUTTON RECOVERY BUTTON MICROSD CARD CONNECTOR Designed bu OUMEX Bulgaria 2013 WWW OLIMEX COM Page 16 of 42 OLIMEX 2014 A20 OLinuXino LIME user s manual CHAPTER 4 THE ALLWINNER A20 MICROCONTROLLER 4 Introduction to the chapter In this chapter is located the information about the heart of OLinuXino its microcontroller The information is a modified version of the datasheet provided by its manufacturers 4 1 The processor The features of the A20 processor according to the manufacturer Allwinner m CPU ARM Cortex A7 Dual Core m GPU m ARM Mali400MP2 m Complies with OpenGL ES 2 0 1 1 m VIDEO m HD H 264 2160p video decoding m Multi format FHD video decoding including Mpeg1 2 Mpeg4 SP ASP H 263 264 VP6 8 AVS jizun Jpeg Mjpeg H 264 High Profile 1080p 30fps or 720p 60fps encoding 3840x1080 30fps 3D decoding BD SBS TAB FP supported Complies with RTSP HTTP HLS RTMP MMS streaming media protocols m DISPLAY Supports multi channel HD display Integrated HDMI 1 4 transmitter with HDCP support CPU RGB LVDS LC
31. hernet controller if it is disabled by default A You can enable it by following these two steps 1 To check under what name the LAN is associated write ifconfig a 2 If for example it is under eth0 name then write dhclient ethO This should enable the Ethernet and then SSH would also be available Page 40 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual You can also enable auto detection of Ethernet on power up by removing the comment auto eth0 in etc network interfaces in the Linux image Q How to install Android on an SD card Two images are built one for 7 LCD and one for 10 LCD https www olimex com wiki A20 OLinuXino LIME To write the images on the SD card you will need a software tool called PhoenixSuit and then Install and run PhoenixSuit Go to the firmware tab of the program and point to a valid Android image note that the images on Gdrive are compressed and you have to extract the archives to img files to be able write them with PhoenixSuit Disconnect the power supply and USB cable from the A20 board Put an SD card in micro SD holder We recommend 4GB class 10 card Press and hold RECOVERY button apply power supply 5V release RECOVERY button Connect USB cable to the mini USB connector You will be asked for drivers for the boot loader Navigate to the folder where you extracted the PhoenixSuit and install the drivers from the respective executables or manually point the i
32. his brings different processor speed and productivity The A10 has a single Cortex A8 core The A20 has dual core Cortex A7 This makes the A20 boards more powerful and suitable for heavier computational tasks but more power hungry The processor swap is possible since the A10 and A20 processors are pin to pin compatible 1 4 Board version used in the manual Revision C boards and resources were used while writing this document It is possible that they are outdated so it is always recommended to download the latest sources from the GitHub page of the board https github com OLIMEX OLINUXINO tree master HARDWARE Please note that A20 OLinuXino LIME design is almost identical to the design of its predecessor A10 OlinuXino LIME the only difference being the processor Even then the processors are pin to pin compatible Some peripherals documents or software may be suitable for both the A20 and the A10 LIME boards but it is generally advised to use resources for the specific board 1 5 Document organization Each section in this document covers a separate topic organized as follows Chapter 1 is an overview of the board usage and features Chapter 2 provides a guide for quickly setting up the board and software notes Chapter 3 contains the general board diagram and layout Chapter 4 describes the component that is the heart of the board the A20 Allwinner processor Chapter 5 is an explanation of the control circuitr
33. ing and whether there is a card inserted 6 3 PWR jack The power jack used is the typical 2 5mm one used by Olimex in most of our products You should provide 5 volts direct current and the required current may vary depending on the peripherals connected to the board The power supply you use should be capable of providing at least 1A of current More info about the power supply can be found in chapter 5 of this manual 6 4 USB OTG The main way of changing the firmware image located on the NAND of A20 OLinuXino LIME 4GB is via the USB OTG connector How to change the firmware is explained after the hardware details The part of the schematic related to the USB is shown below ee NUES m m PH7 USBe DRU ES USBO DRU f m i U S B USB UBUSDET L5 90 US SY628 USB OTG 8 5 9 0 6_ UDMe i t S5o ao ols 2 82 9 mmm lt lt a L Page 22 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual The USB_OTG features Low Loss Power Distribution Switch SY6280 which protects the board in case the devices you have plugged to the USB_OTG attempt to draw more current than 523mA combined The maximum current available on the 5V USB_OTG is exactly 523mA The SY6280 responsible for the USB_OTG is enabled by USBO DR
34. inout and notes about them Jumpers functions are described Notes and info on specific peripherals are presented Notes regarding the interfaces are given 6 1 Communication with LIME The direct communication method is via the serial interface Through male UARTO connector capable of delivering some information on the COM port of your computer and then use your favorite terminal program puTTy teraterm etc to receive the data send commands You can use USB SERIAL CABLE F with the UARTO interface allowing you to connect to a personal computer with a free USB port Note that the levels at board s UARTO are in CMOS level and you would need MAX232 convertor to bring them to TTL one It is highly recommended to own a USB SERIAL CABLE F or similar product at hand when debugging the video output is not always reliable and if you set wrong display settings you might be unable to recover the settings without a proper UARTO connection The more indirect ways of communicating with the board are via peripheral devices mouse and keyboard via a touch screen LCD that is connected on LCD CON connector and others 6 1 2 UARTO interface The UARTO interface might be used for serial communication between the board and a personal computer by default In case of video output problem a cable might provide needed feedback and greatly reduce the efforts needed to repair the board or to adjust the software setting Note that by default only UARTO
35. n you might block one of the processor pins responsible for I2S and AC97 audio output 7 PB9 PH7_USB PB9 PH7_GPIO Controls which processor pin should be used for the USB OTG By default the USB OTG uses processor pin C12 which is port PB9 The same pin port is used for I2S audio In case you want to access the I2S capabilities of the board you would need to change the default position PB9 PH7 GPIO jumper controls which of the two ports PB9 or PH7 should be lead out to pin 9 of GPIO3 connector for easier access Changing this jumper also changes PHZ GPIO the signal available at GPIO 3 connector s pin 9 By default this jumper is in PH7_GPIO position and PH7 is lead to pin 9 of GPIO3 Page 34 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 6 15 Additional hardware components The components below are mounted on OLinuXino but are not discussed above They are listed here for completeness Reset button used to reset the board Power button used to reset the board Recovery button used to reset the board 1x4Gbytes 256Mb x 16 bit DDR3 SDRAM the exact memory used in the board revision mentioned is Memphis MEM4G16D3EABG 1x32Gbytes 4096Mbx8 bit NAND FLASH only available on the 4GB version of the board the exact memory used in the board revision mentioned is hynix H27UBG8T2A PWR_LED turns on upon powering the board CHGLED lights when charging a battery connected to the Li Po battery conne
36. necter for the ease of connecting an LCD We have tested the ability of the board to interact with such a display They allow the user to attach additional hardware check readings or perform hardware debug Important you need additional 40PIN ribbon cable to connect an Olimex display and the LCD CON The LCD connector is suitable for a number of Olimex displays and touchscreen panels with different native resolution the smallest available is the 4 3 one called A13 L CD43TS with native screen resolution of 480x272 through the 7 one named A13 LCD7 with 800x480 to the 1024x600 10 1 A13 LCD10 js joc j 3 qe R je soos j how m 7 homs ua hom m s howe ne an e 3s hom jus homs Jes m how en 2 hom jas 23 hov esa a hos j as how je hos e x joe je 2 hov j 29 pes 3 howwe ho a oak e 3 how Ww 3s pe jua jus as hom a m Jua x ma j e j 39 ma des j Signals marked with are multiplexed with either a peripheral device or another connector Ensure that the multiplexing is handled properly on software and or hardware level else there would probably occur wrong levels loss of dat
37. nstaller to the drivers folder in the PhoenixSuit installation path PhoenixSuit will detect the board and would ask for the method of writing the image Choose method of writing the image and confirm your wish to write the image Wait till upgrade succeeds Note that it is not recommended to have your mini USB connected to an external USB hub This might cause delays and might distort the signal levels Always test with the USB connected straight to the USB ports of your computer Important When Android runs for very first time it takes several minutes to initialize all files and buffers please do not cut the power supply during this process Also when fresh image is installed fast boot may be disabled which means that when you apply power supply after few seconds Android will go in sleep mode and you have to press PWR button to start it you can change to fast boot when you power off there is dialog box asking you if you want next boot to be fast boot you have to check this box before you power off Also note that you must do touch screen calibration when you run Android for very first time which might require a mouse Q Is it possible to boot Linux from the NAND memory A Yes it is possible Customers have been successful in booting from the NAND At the time of writing this document Olimex does not provide a suitable image however It would be up to you to do it Page 41 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 8 5
38. nties of merchantability or fitness for purpose are excluded This document is intended only to assist the reader in the use of the product OLIMEX Ltd shall not be liable for any loss or damage arising from the use of any information in this document or any error or omission in such information or any incorrect use of the product This evaluation board kit is intended for use for engineering development demonstration or evaluation purposes only and is not considered by OLIMEX to be a finished end product fit for general consumer use Persons handling the product must have electronics training and observe good engineering practice standards As such the goods being provided are not intended to be complete in terms of required design marketing and or manufacturing related protective considerations including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards Olimex currently deals with a variety of customers for products and therefore our arrangement with the user is not exclusive Olimex assumes no liability for applications assistance customer product design software performance or infringement of patents or services described herein THERE IS NO WARRANTY FOR THE DESIGN MATERIALS AND THE COMPONENTS USED TO CREATE A20 OLINUXINO LIME AND A20 OLINUXINO LIME 4GB THEY ARE CONSIDERED SUITABLE ONLY FOR RESPECTIVELY A20 OLINUXINO LIME OR A20 OLINUXINO LIME 4G
39. oard without quick boot mode enabled In this case you should press the PWR button for at least 5 seconds which would allow the board to start For the European customers we sell two power supply adapters please check chapter 2 2 We also sell USB OTG to USB type A cables if you lack such The default username password combination for the default Linux image on the SD card if purchased is root olimex Note that it is normal that when the board is powered some integrated circuits might appear hotter than others This is perfectly normal for some chips for instance voltage regulators and the main processor 2 4 Button functions The bellow three buttons usually are supported under both Android and Debian PWR used to perform software turn off software turn on used to turn on board when powered by Page 10 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual battery has to be held down for at least 5 seconds to perform each action RESET used for hardware reset of the board it is not recommended RECOVERY used to wake up the board from sleep It is recommended to always make a soft turn off of the board If that is not possible then please hold PWR button down for a few seconds to turn off the board Then you are free to remove the power supply If you disconnect the power supply either the USB the battery or the power jack before turning off the board you may corrupt your SD card If you have placed NAND m
40. ontroller are Page 25 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 10 100Mbps operation Full half duplex operation Supports auto crossover detection Adaptive equalization IEEE 802 3 802 3u compliant Supports IEEE 802 3u clause 28 1 8V Operation with 3 3V IO signal tolerance and much more The Ethernet connector is grounded according to the standard check GND1 and GND2 lines on the schematics If you use Linux then the Ethernet connector might be used for SSH connection to the board If you lack any other option for debugging it might be hard to guess the correct IP of the board since it has DHCP enabled by default especially if you are in a large network It is good idea to check the default settings by exploring the Linux image settings Those are usually stored in etc network interfaces For DHCP you need to enable auto detection and dhcp as shown below auto ethO ethO inet dhcp For setting a static address please follow the pattern below auto eth0 iface ethO inet static address 192 168 1 5 netmask 255 255 255 0 gateway 192 168 1 254 The EEPROM memory may be used to store the MAC address Important In some Debian images it is possible that the Ethernet doesn t get auto detected during boot up This is done on purpose because if there is auto detection enabled and you don t want to use the Ethernet connector or you have forgotten to plug a cable the start up would be greatly delayed
41. quently asked questions Q I power my board it shows logo and then nothing happens A This might be due to a number of reasons but it is recommended to try the following 1 Download latest official image from our wiki either Android or Debian for SD card and upload it to an SD card again There are instructions how to do it in the other questions below Try if the board works now 2 Check if your power supply provides enough current try with different better power supply 3 Check the USB hub you are using plug the USB cable directly to the back of your personal computer check the USB cable 4 The board might enter sleep mode very fast especially if the Android was turned off without the Quick Boot mode being ticked on Try pressing or holding down the PWR button for a couple of seconds to wake it up Q How do I write the Linux image to a micro SD card to use with my A20 board A To write a Linux image to an SD card under Windows we use Win32 Disk Imager Download Win32 Disk Imager software Insert card Start program Select file Click write To write a Linux image to an SD card under Linux For instance you have an image with the file name of debian 2g img It would be downloaded to the SD card connected to a Linux machine using one of the following commands dd bs 4M oflag sync if debian 2g img of dev sdX Or cp debian 2g img dev sdX where X is the uSD card Q How to detect and enable the Et
42. r firmware changed Because of the nature of the products we deal with prototyping electronic tools we cannot allow returns of items that have been programmed powered up or otherwise changed post shipment from our warehouse All returned merchandise must be in its original mint and clean condition Returns on damaged scratched programmed burnt or otherwise played with merchandise will not be accepted All returns must include all the factory accessories which come with the item This includes any In Circuit Serial Programming cables anti static packing boxes etc With your return enclose your PO Also include a brief letter of explanation of why the merchandise is being returned and state your request for either a refund or an exchange Include the authorization number on this letter and on the outside of the shipping box Please note It is your responsibility to ensure that returned goods reach us Please use a reliable form of shipping If we do not receive your package we will not be held liable Shipping and handling charges are not refundable We are not responsible for any shipping charges of merchandise being returned to us or returning working items to you The full text might be found at https www olimex com wiki GTC Warranty for future reference Page 42 of 42
43. t 2 Pir P wo gt gt N 3 CY m gt gt ito ito lt E G A UJ lt e T x NIT oO ARTO RX ARTO TX B21 PB20 B19 G P P OJo CO T gt x U r U C3 SATA PWR EN 22 C19 UU 3 r N P A N P UU UJ HB oaJ Pip ec on oo d C21 C24 PC23 17 UJ v vj v CY CY N N a N P Signals marked with are multiplexed with either a peripheral device or another connector Ensure that the multiplexing is handled properly on software and or hardware level else there would probably occur wrong levels loss of data etc Pin 29 is used to control the power supply available at the 5V_SATA_PWR by default Page 30 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 6 10 GPIO 2 General Purpose Input Output 40pin connector The GPIO pins are led out on a separate 40pin connecter They allow the user to attach additional hardware check readings or perform hardware debug The GPIO 2 connector numbers are printed at the bottom of the board for your convenience GPIO 2 connector connector a jw L 4 22 je Lr pes 8 E E A19 C23 Ca pem for a s 23 poma a a Pe h as pas jo jue a Ca par e jar h 29 pas s a CS Ca pes ko x
44. t A10 OLinuXino LIME BOX an aesthetic box specially made for the board that protects it from dust and accidental short circuits USB SERIAL CABLE F USB serial console cable female USB MINI CABLE standard USB type to USB type mini cable SY0605E reliable power supply adapter 50Hz EU 5V 1A for A20 OLinuXino LIME SY0605E CHINA cheaper power supply adapter 50Hz EU 5V 1A for A20 OLinuXino LIME A20 LIME ANDROID SD tested class 10 micro SD card with the latest by the time of leaving the Olimex facilities official Android release A20 LIME DEBIAN SD a tested class 10 micro SD card with the latest by the time of leaving Olimex facilities official Debian Linux release A20 OLinuXino LIME UEXT an adapter from 0 05 step connector to 0 1 step one also suitable for LCD adapting A13 LCD43TS low cost 4 3 LCD display with touchscreen component 480x272 A13 LCD7 low cost 7 LCD display with optional touchscreen component 800x480 A13 LCD10 low cost 10 LCD display with optional touchscreen component 1024x600 How to purchase You can purchase directly from our online shop or from any of our distributors Note that usually it is faster and cheaper to purchase Olimex products from our distributors List of confirmed Olimex LTD distributors and resellers https www olimex com Distributors Please visit https www olimex com for more info Page 39 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual 8 4 Fre
45. thermore you might bend the board s or the cable s pins Use pliers or other suitable object to disconnect the connectors carefully This connector features the processor signals needed for audio headphones output and microphone input Please note that not only the connectors but also the rest of the schematic is missing You would need to add resistors and capacitors The connector also has the signals needed for a VGA output We don t provide software solutions for the VGA video output Microphone signals are MICIN1 and VMIC Headphone signals are HPOUTL HPCOM and HPOUTR VGA signals are LRADCO LRADC1 VGA G VGA B and VGA R A general advice for easier use of the microphone headphone and VGA interfaces of A20 OLinuXino LIME is to take a look at the schematics of another board with those interfaces already installed For example those are present in A20 OLinuXino MICRO Inspect the schematic carefully The signal layout is described below GPIO 1 connector Signal name Processor pin Pin Signal name Processor pin Uu e z 00 0 oin PIN ole b lt qa Y a T O P o UJ lt N gt ow UJ HB rri HB gt C HB gt N gt N 0 N m N P o N e lt N S T g
46. y associated with the microcontroller Chapter 6 covers the connector pinout peripherals and jumper description Page 6 of 42 OLIMEXO 2014 A20 OLinuXino LIME user s manual Chapter 7 provides the schematics and the dimensions of the board Chapter 8 contains the revision history useful links and support information Page 7 of 42 OLIMEX 2014 A20 OLinuXino LIME user s manual CHAPTER 2 SETTING UP THE OLINUXINO BOARD 2 Introduction to the chapter This section helps you set up the OLinuXino development board for the first time Please consider first the electrostatic warning to avoid damaging the board then discover the hardware and software required to operate the board The procedure to power up the board is given and a description of the default board behavior is detailed 2 1 Electrostatic and electrical polarity warning OLinuXino is shipped in a protective anti static package The board must not be exposed to high electrostatic potentials A grounding strap or similar protective device should be worn when handling the board Avoid touching the component pins or any other metallic element If you connect other electrical devices to the LIME board make sure that they have equal electrical polarity For example when you connect an HDMI cable between a TV and the board it is a good idea to have them both connected to the same electrical source to the same utility power socket This might be said for a serial cable conn
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