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A20-OLinuXino

1. A20 OLinuXino MICRO Open source single board Android Linux mini computer USER S MANUAL Revision C August 2013 Designed by OLIMEX Ltd 2013 lead free All boards produced by Olimex LTD are ROHS compliant OLIMEXO 2013 A20 OLinuXino MICRO user s manual DISCLAIMER 2013 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 warranties of m
2. Ethernet cable for wired Ethernet Page 8 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual A number of extension modules that can add functionality or interface to the board on the UEXT connector these can be explored here https www olimex com Products Modules Some of the above suggested items can be purchased by Olimex for instance SY0612E reliable power supply adapter 50Hz for EU 12V 0 5A for A20 OLinuXino MICRO SY0612E CHINA cheaper power supply adapter 50Hz for EU 12V 0 5A for A20 OLinuXino MICRO A20 Android SD a tested class 10 micro SD card with the latest by the time of leaving the Olimex facilities official Android release A20 Debian SD a tested class 10 micro SD card with the latest by the time of leaving Olimex facilities official Debian Linux release USB SERIAL CABLE F USB serial console cable female USB MINI CABLE standard USB type A to USB type mini cable CABLE IDCA0 15cm cable for LCD to LCD CON connection A13 LCD43TS low cost 4 3 LCD display with touchscreen component 480 x 272 A13 LCD7 low cost 7 LCD display with optional touchscreen component 800 x 480 A13 LCD10 low cost 10 LCD display with optional touchscreen component 1024 x 600 2 3 Powering the board There are three possible ways of powering A20 OLinuXino MICRO 4GB via external supply providing 6 16V DC at the power jack from 5V USB port via USB connector or from 3 7V Li Po battery via the LIPO
3. Page 28 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual 6 12 GPIO 1 General Purpose Input Output 14pin connector The GPIO 1 plastic connector has 14 pins The signal layout is described below GPIO 1 connector Processor pin GND GND lt lt r r i fat wo wo c gt gt lt N N w N AB23 10 MENU BUT 12 SEARCH BUT 14 HOME BUT AB23 16 ESC BUT 18 ENTER BUT AB23 TVOUT3 TVINO TVIN1 gt gt gt gt gt 0 w w w ejeje N N N N co N UJ w w Ww TVIN2 gt TVIN3 lt LINEINR LINEINL gt lt FMINL MIC1OUTP MIC1OUTN 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 It was erroneously named GPIO 4 in the first release of the board AlI Android buttons are connected to an ADC LRADC that uses a divider to determine which button is pressed The yellow part of the table shows all the signals shared with the 6 pin VGA connector 6 13 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 Th
4. BAT Note that the board consumes around 300mA of current at 12V when there are no peripherals connected to the USB hosts so make sure the power supply is able to provide at least 500mA before plugging 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 The best practice is not to count on the mini USB OTG as a single power source The preferred way of powering the board is via the PWR jack with 6 16V DC with a power of SW e g 6Vx0 8A 16Vx0 3A This will make the board fully powered and able to power all the peripherals connected to it Note that when powering the board from the USB the power 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 MICRO 4GB is between 100mA and 320mA depending on the current load and the power voltage applied If the board has entered power down state you can bring it back without restart using the PWR BUT The BUT is also used to start the board when powered from a Li Po battery on the battery connector 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 Page 9 of 40 OLIMEXO 2013 A20 OLinuXino
5. MICRO user s manual 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 and NAND image restore in Android The bellow three buttons usually are supported under both Android and Debian PWR BUT used to perform software turn off software turn on used to turn on board when powered by 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 The following buttons represent functions in the Android it is possible that not all Android applications take advantage of the buttons in such case the button would serve no purpose for that application VOL increases the volume VOL lowers the volume MENU brings up the main menu SEARCH brings up search feature HOME shows the home screen note that HOME is also used to enter bootloader mode for firmware update ESC used to navigate away of a menu ENTER to select a choice It is not recommended to disconnect the power supply either the USB or the power jack before turning off the Android from the either the menus or by holding BUT sys
6. Supports dual sensors BH MEMORY DDR2 DDR3 DDR3L controller Page 13 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual NAND Flash controller with 64 bit ECC AUDIO W Integrated HI FI 100dB Audio Codec m Dual analog mic amplifiers More information can be found on Allwinner s web site at the following web address http www allwinnertech com en product A20 html 4 2 Block diagram The block diagram is taken from Allwinner s web site a ARM Cortex A7 Thumb 2 FPU Security System ARM Cortex A7 NEON SIMD User Interface GPU Audio Codec Camera Interface Video Engine ARM Mali400 ARM Mali400 Display Engine Connectivity System Display Interface TV Decoder USB OTG 2 USB HOST ff Interrupt Controller CPU RGBLCD GMAC EMAC SD MMC ff Timer HS Timer LVDS L TV Encoder 25 7 16 HOMI1 4 HOCP Page 14 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual CHAPTER 5 CONTROL CIRCUITY S Introduction to the chapter Here you can find information about reset circuit and quartz crystals locations the power supply circuit is discussed 5 1 Reset The board has hardware reset controlled by the AXP209 power system management IC The board should be turned off the standard OS menu that might be invoked by holding POWER button or poweroff command under Debian and after the choice is con
7. provides a user s guide for the Olimex A20 OLinuXino 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 MICRO 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 available to the customer 1 1 Features The board has the following set of features note about the difference between the two versions of the board A20 Cortex A7 dual core ARM Cortex A7 CPU and dual core Mali 400 GPU 1GB 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 VGA output on 6 pin 1 25mm 0 05 step connector 100MBit native Ethernet Battery connector with battery charging capabilities Audio headphones output on connector Microphone input on connector 2x UEXT connectors LCD connector compatible with with 4 3 7 0 10 1 LCD modules from Olimex 160 GPIOs on three GPIO connectors MicroSD card connector SD MMC car
8. the button is used to enter bootloader mode to connect via USB OTG When in REC VPS SMT Reserved for future use of different types of NAND memories VPS SMT Reserved for future use of different types of NAND memories 6 17 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 2 x 2Gbytes 2 x 256Mb x 8 bit DDR3 SDRAM the exact memory used in the first revisions of the board is Memphis HSTQ2G83CFR H9C H5TQ2G63BFR 1 x 32Gbytes 4096Mb x 8 bit NAND FLASH the exact memory is hynix H27UBG8T2A PWR LED lits upon powering the board LED1 GPIO button Page 33 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual CHGLED lits when charging a battery connected to the Li Po battery connector Page 34 of 40 OLIMEXO 2013 A20 OLinuXino MICRO 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 MICRO 7 1 Eagle schematic OLinuXino schematics may be found it on the OLinuXino s GitHub repository https github com OLIMEX OLINUXINO tree master HARDWARE A20 OLinuXino MICRO You can download the whole repository as zip without having a GitHub account Please note that the schematics of A10 not to be confused with A10s and A20 boards are the same since the two Allw
9. variants There are two major board variants named A20 OLinuXino MICRO 4GB and A20 OLinuXino MICRO The 4GB version has a built in NAND memory suitable for the storage of an operating system without the need of a SD card The 4GB version comes with already programmed Android 4 2 2 image The other Olimex boards with close characteristics are the ones with A13 and A10 A 10s microcontrollers The A13 boards feature a generation older processor but since they have been longer on the market they have better Linux and Android support The A10 A10s boards feature single than A20 processor core but they are more energy efficient making them better choices for handheld devices and devices requiring power efficiency 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 1 4 Board version used in the manual Revision E 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 1 5 Organization Each section in this document covers a separate topic organized as follow Page 6 of 40 OLIMEXO 2013 A20 OLinuXino M
10. 2 nEsETE TPRx 8 1206 4X0603 488 4 7k o PER mE RTLS201Cp EEEE RAL206_ 4X 6 3 _4B8_51R UE NA C92 100nF ari ER LAN 1 EN RJLBC Q6 TC1_GND_MILLING 2 Page 26 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual i234 6 10 HDMI connector The part of the schematic that describes the HDMI module is shown below IN1 0011 IN2 OUT2 IN3 OUT3 IN4 OUT4 GND GND OUT4 IN2 QUT2 IN3 OUT3 IN4 OUT4 GND GND 1 OUT1 IN2 OUT2 IN3 OUT3 IN4 OUT4 GND GND to co Nav lal foo IN NI o HDMI SWM 19 RCLAMP 524P 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 Page 27 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual output HDMI connector Lis Sierat vane processor in Pin Signal nane processor pin La ee qe md 1 3 em id U23 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 6 11 SATA connector and power The part of the schematic describing the SATA module is shown below SATA connector SATA TXP SATA TXP SATA TXM SATA TXM Eg ee SATA RXP_c143 ll 18nF E fou SATA RXM_c142 19 SATA RXM SATA RXP NAC22UF 76 305
11. 8 Page 19 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual SD MMCI slot is the smaller 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 10M Byte sec card for faster read write operations lower class cards especially higher capacity ones might slow down the whole system microSD card connector oe eee om 0 E 3 6 2 2 SD MMC slot The schematic related to the SD MMC1 SD MMC connector is shown below CD DAT3 CS CMD DI 0551 UDD CLK SCLK USS2 4 SDC3 CLK 5 6 RM15G2 SDC3 DO 7 DAT8 DO RM1561 sDC3 D01 8 DAT1 RES RM19563 SDC3 D2 9 DAT2 RES anise PH14 SDC3 DET RM1564 11 50 3 0 CD 1206 4X0603 488 100K R 1206 4X06035 4B8 100K Page 20 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual The SD MMC2 slot is located on the back of the PCB and works with the larger SD and MMC cards The connector was mounted to to popular demand Note that by default this connector is not suitable for booting OS Such support is possible but not implement
12. ICRO user s manual 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 circuitry associated with the microcontroller Chapter 6 covers the connector pinout peripherals and jumper description 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 40 OLIMEXO 2013 A20 OLinuXino MICRO 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 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 2 2 Requirements In order to se
13. R 2R USB_OTG 5 50 0 6 USB IDDET 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 DRV processor pin C12 thus the Page 23 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual USB OTG is also controlled by the same signal USB OTG connector Fin si mane processor pin USBO IDDET The connector case is also grounded fore 6 7 USB_HOST connector The part of the schematic related to the USB_HOST connector is listed below USB HOSTs U10 SY6280 IN OUT USB1 DRU 4 EN L8 FB0805 600R 28 UOM1 UDP1 4 1 C130 5 d 2 5 set N C128 R47 R48 uS 10k 13 1 6 6800 85 Iset 523mA eanr ABQuF 16U LDHESR 105C 6 3x11mn RH2 5 LEUEL HOST 50 011 576280 IN our USB2 DRU 4 EN L10 FB 805 60R 2A UDM2 UDP2 FB0805 600R 2n C137 USB 5 0582 0581 USB THO z 2 5 N C136 R54 R55 u 10k Iset 6800 Rs Iset 1000 16U LOLESR 105C 6 3x14 nn 2 5 The USB HOST connector features two levels called USB1 and USB2 in the schematic The connector is situated between the USB and the HDMI connector Each o
14. com Products OLinuXino A20 A20 OLinuXino MICRO 4GB https www olimex com Products OLinuXino A20 A20 OLinuXino MICRO 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 2 freenode net http webchat freenode net channels olimex Page 38 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual ORDER CODES A20 OLinuXino MICRO 4GB the NAND version of A20 OLinuXino MICRO with additional 4GB NAND memory and built in Android image A20 OLinuXino MICRO the lite version of A20 OLinuXino MICRO with no external NAND USB SERIAL CABLE F USB serial console cable female USB MINI CABLE standard USB type A to USB type mini cable SY0612E reliable power supply adapter 50Hz for EU 12V 0 5A for A20 OLinuXino MICRO SY0612E CHINA cheaper power supply adapter 50Hz for EU 12V 0 5A for A20 OLinuXino MICRO A20 Android SD a tested class 10 micro SD card with the latest by the time of leaving the Olimex facilities official Android release A20 Debian SD a tested class 10 micro SD card with the latest by the time of leaving Olimex facilities official Debian Linux release A13 LCD43TS low cost 4 3 LCD display with touchscreen component 480 x 272 A13 LCD7 low cost 7 LCD display with optional touchscreen component 800 x 480 A13 LCD10 low cost 10 LCD display with op
15. d connector DEBUG UART connector for console debug with USB SERIAL CABLE F GPIO LED Battery charge status LED Power LED 2KB EEPROM for MAC address storage and more 10 BUTTONS with ANDROID functionality RESET button Page 5 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual 4 mount holes e 6 16V input power supply noise immune design e PCB dimensions 5600 x 3250 mils 142 24 x 82 55 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 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 strong points of the 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
16. e GPIO 2 connector numbers are printed at the bottom of the board for your convenience Page 29 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 GPIO 2 connector PIO pin Signal name Processor pin GPIO pin Signal name Processor z lt O 2 UU H gt N N UJ HB oo N U H HB c N N A C N UJ o pene f jme ee Lo em eme T Eo ee je pem m 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 30 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual 6 14 GPIO 3 General Purpose Input Output 10pin connector GPIO 3 connector features the signals of AXP152 on a convenient header The signals available might be used to implement power controls on the board for instance turning off the device at specific voltage level or GPIO 3 connector ore secu Co e e Cs e w Ca LE p Ca es o ded m Eo m m e Je e e de x es o em e Ja p Cs a Co e k ke pe Signals mark
17. ed in the official software releases SD MMC card connector ai ecco 3pm 227022000 ELCHE 00 Additionally there are the WP and CP switches that are responsible respectively for sensing whether the card is locked for reading and whether there is a card inserted Page 21 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual 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 6 to 16 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 500mA of current _ mm More info about the power supply can be found in chapter 5 of this manual 6 4 MIC IN amp HEADPHONES connectors The part of the schematic related to those connectors is listed below Audio Out amp Mic N 2 o I a e T I Page 22 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual Standard MIC IN jack is mounted for audio input to the board Note that it is a single channel MIC IN The MIC IN is a mono input MIC IN connector Headphones connector Signal name The connector can interface standard 3 5 mm phone connector also known stereo plug or audio plug 6 6 USB OTG connector The part of the schematic related to the USB is shown below L6 FB0805 600
18. ed 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 6 15 LCD CON 40pin connector The LCD CON pins are led out on a separate 40pin connecter 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 Page 31 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual LCD CON connector Signal name Processor pin a je os je p AA11 LCD D19 GPIO pin ul lt LCD_D16 N LCD_D18 LCD D20 LCD D21 LCD D22 LCD D23 AC10 13 LCD D15 AA LCD D8 lt LCD D10 LCD D12 LCD D14 LCD DO LCD D1 AC15 LCD D2 LCD D3 AC14 LCD_D4 LCD_D5 AC13 AC12 Pl ry ri rit lt LCD D6 LCD D7 LCD HSYNC AB9 LCD VSYNC 9 LCD CLK 9 LCD DE UJ UJ PB3 B1 P BA A13 e e e 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 le
19. erchantability 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 MICRO THEY ARE CONSIDERED SUITABLE ONLY FOR A20 OLINUXINO MICRO Page 2 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual Tab
20. f slots them features a Low Loss Power Distribution Switch SY6280 which protects the board in case the devices you have plugged to each level USB HOST try to draw more current than 523mA combined The maximum current available on each slot of the 5V USB HOST is exactly 523mA The SY6280 responsible for the USB1 is enabled by USBO DRV 1 processor pin A4 thus the USB OTG is also controlled by the same signal The SY6280 responsible for the USB2 is enabled by USBO DRV2 processor pin A5 thus the USB OTG is also controlled by the same signal Page 24 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual USB HOST two level connector Signal name Processor pin Signal name Processor pin 152 UDM1 P20 xm UDM2 R20 1 3 UDP1 P21 ea UDP2 R21 The GND is common for both levels of the USB_HOST 6 9 Ethernet The LAN connectivity is handled by Realtek s RTL8201CP Some of the features of this 10 100Mbit controller are 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 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 Thi
21. firmed 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 A20 microcontroller 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 MICRO requires input supply of 6 16V The minimum wattage is 5W and this threshold may raise if using a lot of devices on the USB HOST via external hub lot of GPIOs and the LCD CON Page 15 of 40 OLIMEXO 2013 A20 OLinuXino MICRO 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 pinout 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 the A20 The more direct communication methods include connection via the bootloader and via the serial interface The chip has a built in bootloader for communication with computer systems via a USB cable suitable only for con
22. ight be found at the wiki page https www olimex com wiki A20 OLinuXino MICRO Page 17 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual 6 1 2 UART0 UEXT1 UEXT2 interface The UARTO might be used for UART communication by default It is typically used for serial terminal debug The UEXTs are typically used for connecting additional modules Note that by default only UARTO is defined as a port suitable for serial debug You can use our USB SERIAL CABLE F for debugging UEXT1 and UEXT2 are 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 bw m oem 000 p pe qmm 0 pea opum 000 pe pem UEXT2 BEEN NN peqem pee 00 opem pem The UEXT connectors are used as an interface for the Olimex s UEXT modules usually boards Page 18 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual with MOD prefix in their commercial names For more information on UEXT please visit https www olimex com Products Modules UEXT resources UEXT pdf 6 2 SD card connectors There are two SD card connectors on this A20 board The now common microSD card connector is loca
23. inner processors are pin to pin compatible drop in replaceable Both the 4GB version and the version without NAND of the A20 MICRO share the same set of schematics 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 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 35 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual 7 2 Physical dimensions Note that all dimensions are in mils SEEN EN dimensions are mils A10 820 OLINUXINO MICRO rev D OLIMEX LTD PLOUDIU BULGARIA 2013 The three highest elements on the board in order from the tallest to the shortest are USB HOST connector 700mils capacitors C202 650mils the Ethernet connector 600mils The heights listed above include the PCB height Page 36 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual CHAPTER 8 REVISION HISTORY AND SUPPORT 8 Introduction to the chapter In this chapter you will find the cu
24. le of Contents ie m ib 2 CHAPTER 1 OVERVIEW 5 1 Introdu ction esii inae s co anas es age rao e eua abs aea eoa aseo aane er oa es e e eaa spa ur S eoe 5 LA CAIN E E EE EAEN AEAEE PA E EE AOE AT E EE N EET EATA EE AEREE 5 1 2 Target market and purpose of the 6 13 Board varidi S eainiie aa 6 1 4 Board version used in the manuall ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssecenseees 6 RESP RM 6 CHAPTER 2 SETTING UP THE OLINUXINO 8 2 Introduction to the Chapter cccccscsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssossses 8 CHAPTER 4 THE ALLWINNER A20 MICROCONTROLLER 13 4 Introduction to the chapter co pae a eos 2 4 inda eae DR UMEN UE VER 13 4 1 The ER 13 CHAPTER 5 CONTROL CIRCUITY ssssssssscccsssscccsscccsssecoosscccssscoseccsscosecosccsee 15 5 Introduction to the Chapter sccccccsssssssssssssssssccsssssssssccccsssssssssnssssccssessssssncssscccccccscosssees 15 6 1 Communication with the A20 ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssscssessnsesscssosss 16 6 1 1 USB OTG com
25. munication NAND firmware repair update ecce cernere eene 16 6 1 2 VARTO UEXTT UEXT2 IDteEIAGG oec erre teet e eo erae haa eer vr bye e ae vr ee ee ve eee e veces 18 6 2 SD CODDECELOESu i n c e iv rd Ci el e spl aH ve baa P ste pd Cu C a eines 19 6 2 Slt iiie c sue epos t opea 19 6 2 2 SD MMC ERREUR 20 Page 3 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual 6 6 USB OTG cConneclot is caccccsseccssecscsssstasissessssucesstesisvassscdescsbesdesebessusedavesssesssesesssasessevssssbssebensess 23 6 7 USB HOST UT esesug eure eue Ul Pa oS VERUS 24 6 9 NA a A EA E E A E E A LN 25 6 15 LCD CON COBDBCIDE 31 6 16 Jumper descriptiQI Sae ce ce Fea boast aba pesada Pu 33 CHAPTER 7 SCHEMATIC Xu DD RR ERES 35 7 Introduction to the chapte ERERIEREEIEREREREERRERERREETPEERERSTEREEUDEBERSUSSUM 35 CHAPTER 8 REVISION HISTORY AND 37 8 Introduction to the capter eee se ao esi ases vases ea n aeo ea ost ua so aa E aseo eaae eissaia 37 Page 4 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual CHAPTER 1 OVERVIEW 1 Introduction to the chapter Thank you for choosing this OLinuXino single board computer from Olimex This document
26. nd 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 their 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
27. nection with PhoenixSuit program for firmware update There is a second option to connect to the board which is the 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 an USB port 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 1 USB OTG communication NAND firmware repair update The main way of changing the firmware image located on the NAND of A20 OLinuXino MICRO 4GB is via the USB OTG connector We have configured an Android image with settings suitable for A20 OLinuXino MICRO 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 MICRO 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 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 for A20 2 Go to firmware tab of the program and poi
28. nt to a valid Android image the latest official one may also be downloaded from the A20 wiki article 3 Disconnect the power supply and USB cable from the A20 board 4 Press and hold RECOVERY button apply power supply 6 16 V release RECOVERY button 5 Connect USB cable to the mini USB connector Page 16 of 40 OLIMEXO 2013 A20 OLinuXino MICRO 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 Firmware Caution Please Check the Device Power Before Upgrade Do not Unplug Device during the Upgrade Procedure There are different flavors of the Android and Linux distributions depending on whether you want to use 50Hz HDMI or 60Hz HDMI or 7 display or 10 display etc You might need to change the configuration files inside depending on your current setup the SD card explore the SD card and make sure the correct corresponding your needs script bin is placed in the first SD card partition overwrite the original one Those images the software required and further instructions m
29. rrent 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 8 1 Document revision Revision date Changes Modified page A 30 08 13 Initial manual release Quartz values error fixed 15 EIS ue 1s Updated the board revision changes 16 Added new additional products 9 C 18 09 13 Added more information about the SD 43 card booting 8 2 Board revision Remember to check the schematics and the board design files to compare the differences Initial release of the board Resistor matrix RM23 gets replaced by R133 R134 R135 C Adjusted the package of H5TQ2G63BFR MEM4G16D3EABG 125 R12 and R15 values changed to OR NAND E jumper is changed from PTH to SMD closed 5 SATA connector altogether with 2x2uF is changed Page 37 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual from WF2S to DW 2S and placed near the PWR jack instead of original position 6 GPIO 4 is now correctly named GPIO 1 7 There is a signal for the power of of the SATA PB8 SATA PWR EN r136 c216 r138 t1 t137 fet4 8 A jumper between 5V E SATA and 5V PWR SATA is added 9 The micro SD card connector is changed Resistor optimizations Adjusted and optimized PCB names 8 3 Useful web links and purchase codes The web pages you can visit for more information about your device are https www olimex
30. s 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 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 25 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual thernet EEPROM 180nF C aono 89 22uF 6 3U i AGND 16 Kbit 2048 x 8 DUDD33 680R 200n6K201209 601 C65 C66 _ C67 3 3U 100nF 11 t 22uF 6 3U 5 46 33pF 41072 4 egg 4SB25 000F 20E15 5x3 2mm 20ppm 20pF 3 3U RA1206_ 4X0603 _4B8_4 7k RM9G1 RAi206 4XO403 488 4 7k ECRS 23 TERI DRE ha T BM9G2 61206 AX0403 4BO 4 7k ECOL LED2 Puvap2 42 RMSG3 RAL 206 4X0403 488 4 7k 13 RM9G4 RA1206 4 488 4 7k LED3 PHYAD3 R20 2k 1 28 LED4 PHYAD4 1063 201206 4 7 3 300 100 74 C75 is PHFBOUT 32 FBe80S 600R 200 c201209 501 C76 3 300 43 22uF 6 3U ISOLATE 3 300 44 MII SNIB Bie TPTX B NC TPRX 3 300 4
31. ser s manual 3 2 Layout bottom view At the bottom of the board there are mainly buttons and the large SD MMC connector SD MMC2 RESET RECOVERY Made in Bulgaria 2813 Designed by OUImex 7 HHW OLIMEX COM pin o s 02 50 sopan rao JE ALL gt PWR BUT VOL MENU HOME ENTER MOUNTHOLE VOL SEARCH ESC Page 12 of 40 OLIMEXO 2013 A20 OLinuXino MICRO 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 microcontroller m CPU ARM Cortex A7 Dual Core GPU ARM Mali400MP2 Complies with OpenGL ES 2 0 1 1 m VIDEO HD H 264 2160p video decoding Multi format FHD video decoding including Mpeg1 2 Mpeg4 SP ASP GMC H 263 H 264 VP6 8 AVS jizun Jpeg Mjpeg etc H 264 High Profile 1080p 230fps or 720p 60fps encoding 3840x1080 230fps 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 LCD interface Supports CVBS YPbPr VGA Integrated TV decoder BH CAMERA Integrated parallel 8 bit I F YUV sensor Integrated 24 bit parallel YUV 444 I F Supports 5M CMOS sensor
32. t up the A20 OLinuXino MICRO 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 HDMI enabled monitor screen projector or OLIMEX LCD TS display 40 pin CABLE IDC40 15cm 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 6 16V DC 5W required 10V 2 0 5A for optimal power USB SERIAL CABLE F for Android Linux debugging on UARTO CABLE IDC40 15cm cable used for LCD CON LCD display Additional items include Audio device for HEADPHONES jack
33. ted on the top of the board near the audio in out connectors Note that by default only the micro SD card slot might be used for booting the OS However due to popular demand there is also an SD MMC card connector located on the bottom of the board Both SD slots might be used simultaneously there is no data multiplexing lines For instance one of them might be used for booting the OS the other for saving data As a 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 MICRO 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 microSD card 6 2 1 SD MMC1 slot The schematic related to SD MMC1 microSD connector is shown below R29 896414 SD MMC1 CD DAT3 CS CMD DI USS UDD CLK SCLK _2AT2 RES 76R 250n 21464 SD DET MICRO_SD MMC_CP_NEWTFC WPAPR
34. tem written on the NAND 2 5 Prebuilt software The 4GB board variant comes with Android 4 2 2 ready to use The default settings of the software are followed The default image works with HDMI monitor and 7 display How we have installed the software Detailed information might be found in chapter 6 1 1 USB OTG communication NAND firmware repair update 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 MICRO Page 10 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual CHAPTER 3 A20 OLinuXino MICRO 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 MICRO board itself 3 1 Layout top view The picture below shows the initial revision of A20 OLinuXino MICRO 5V SATA PWR VGA LCD CON UEXT1 SATA NOE RERO SD MMC1 MIC IN HEADPHONES GPIO 3 USB OTG 5 48 E 2 UARTO UEXT2 MOUNT HOLE GND PIN Please note that the NAND memory is present only in the 4GB version of the board Page 11 of 40 OLIMEXO 2013 A20 OLinuXino MICRO u
35. tional touchscreen component 1024 x 600 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 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual 8 4 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 a
36. vels loss of data etc 35 LCD_PWR c4 lt P lt N N 37 lt Ala Ww lt x BIB UJ lt 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 LCD43TS with native Page 32 of 40 OLIMEXO 2013 A20 OLinuXino MICRO user s manual screen resolution of 480x272 through the 7 one named A13 LCD7 with 800x480 to the 1024x600 10 1 A13 LCD10 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 MICRO using an operating system NAND flash Since the configuration in the Debian images is set to HDMI and 1024x600 default settings you would need to change a configuration file in the main partition of the SD card Detailed information and download locations for the script files might be found at https www olimex com wiki index php title Configuration of hardware in the debian image 6 16 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 PTH UBOOT Changes the functionality of the BOOT REC button when in UBOOT position
37. 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 40 of 40

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