OLIMEX T2-LIME-E4GS16M-I [42/49] Physical dimensions

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• There is no warranty for the design materials and the components used to create a20 olinuxino lime2 and a20 olinuxino lime2 4gb they are considered suitable only for respectively a20 olinuxino lime2 or a20 olinuxino lime2 4gb p.2
• Disclaimer p.2
• Table of contents p.3
• Introduction to the chapter p.5
• Features p.5
• Chapter 1 overview p.5
• Board variants p.6
• Target market and purpose of the board p.6
• Board version used in the manual p.6
• Document organization p.7
• Requirements p.8
• Introduction to the chapter p.8
• Electrostatic and electrical polarity warning p.8
• Chapter 2 setting up the olinuxino board p.8
• Powering the board p.10
• Serial connection at uart0 p.11
• Interacting with the board p.11
• Button functions p.11
• Ssh via mini usb cable in debian p.12
• Lcd display p.12
• Hdmi monitor p.12
• Ssh via ethernet connector p.13
• Changing the default video output resolution p.13
• The displays whose names contain ts include a resistive touch screen component p.16
• The displays recommended for the board at the moment of writing might be found in the following table p.16
• The cable used for connection depends on the specific board you are using and more specifically it depends on the pitch of the lcd connector of the board we have two cables both 40 pins ones but one for the bigger pitch 0 and the other for the smaller one 0 5 each of the displays listed in the table further below has two connectors suitable for both cables p.16
• 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 is to use the lcd_con row of pins the step between the pins of the connector is the smaller one only 0 5 compared to 0 of bigger boards p.16
• Newer displays made by olimex have both 0 and 0 5 step connectors going for an lcd output you would also need need and a cable to attach the display to the board the cable is sold separately p.16
• 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 p.16
• Connecting and calibrating a display p.16
• Calibrating a display under android is pretty straightforward from the android application p.16
• Cable idc40 6cm 6cm long cable suitable for 0 step connectors product page p.16
• Cable 40 40 10cm 10cm long cable suitable for 0 5 step connectors product page p.16
• Android calibration p.16
• Gpio under debian p.17
• Debian calibration p.17
• Software support p.18
• I2c and spi under debian p.18
• 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 p.19
• Layout top view p.20
• Introduction to the chapter p.20
• Chapter 3 a20 olinuxino lime2 board description p.20
• Layout bottom view p.21
• At the bottom are located mainly the buttons and microsd card connector p.21
• The processor p.22
• Introduction to the chapter p.22
• Chapter 4 the allwinner a20 microcontroller p.22
• The block diagram is taken from allwinner s web site p.23
• Block diagram p.23
• Power supply circuit p.24
• Introduction to the chapter p.24
• Clocks p.24
• Chapter 5 control circuity p.24
• Introduction to the chapter p.25
• Chapter 6 connectors and pinout p.25
• Uart0 interface p.25
• Microsd card connector p.25
• 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 10mbyte sec card for faster read write operations lower class cards especially higher capacity ones might slow down the whole system p.26
• The schematic related to the sd mmc microsd connector is located on the top of the board and the schematic shown below p.26
• Sd mmc1 slot p.26
• 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 p.26
• 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 p.27
• Usb_otg p.27
• 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 p.27
• The power jack used is the typical dc barrel jack one used by olimex 2 6 9 mm in most of our products more information about the exact component might be found here https www olimex com wiki pwrjack p.27
• The main way of changing the firmware image located on the nand of a20 olinuxino lime2 4gb is via the usb otg connector the update of the android image is explained at the bottom of this sub chapter the connector can also be used for establishing ssh connection to the default debian linux of lime2 boards for more information about the tethering please refer to 2 ssh via mini usb cable in debian the part of the schematic related to the usb_otg is shown below p.27
• Pwr jack p.27
• More info about the power supply can be found in chapter 5 of this manual p.27
• The sy6280 responsible for the usb_host1 is enabled by usb0 drv1 processor pin a4 p.29
• The part of the schematic related to the usb_host connectors is listed below p.29
• The gnd is common for both levels of the usb_host p.29
• Usb_host connectors p.29
• There are 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 p.29
• The sy6280 responsible for the usb_host2 is enabled by usb0 drv2 processor pin a5 p.29
• The lan connectivity is handled by realtek s rtl8211cl it is capable of transmission rate up to 1gbps over industry standard cat utp cable with ber less than 10 10 in 1000base t the controller is compatible with some of the major industry standards it complies with 1000base t ieee 802 ab 100base tx ieee 802 u 10base t ieee 802 and ieee 802 rgmii among others p.30
• The ethernet connector is grounded according to the standard check gnd1 and gnd2 lines on the schematics p.30
• The eeprom memory may be used to store the mac address p.30
• Important you can configure static dhcp given ip addresses in etc network interfaces p.30
• 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 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 p.30
• Ifconfing a dhclient eth as seen after after the ifconfing command p.30
• 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 p.30
• Gigabit ethernet p.30
• For setting a static address please follow the pattern below p.30
• For dhcp you need to enable auto detection and dhcp as shown below p.30
• Pin 14 of the hdmi is not mandatory in hdmi 1 1 c it is reserved pin in hdmi 1 it is optional p.31
• 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 p.31
• Hdmi connector p.31
• The part of the schematic that describes the hdmi module is shown below p.31
• Note that you can power only 5v hard drives via the board s 5v_sata_pwr connector if your hard drive requires 12v of voltage you would need to provide external power supply p.32
• You can make an adapter cable accordingly the other options is to check the sata cable set that we have available p.32
• Which pin does the software control of the sata powering is determined by the position of the pc3 pb8 jumper by default pc3 is used p.32
• To keep the low form factor we have placed the small jst connector p.32
• Three of the gpio connectors have 40 pins and the last one has 20 pins note that all gpio connectors have 0 5 50 mil step between pins olimex sells a compatible extension cable for these connectors named cable 40 40 10cm p.32
• There are four gpio ports which are used generally to access unused by the board s peripherals pins however there are exceptions some of the pins might be used to easily peripherals or their levels p.32
• The sata connector allows you to connect hard drives to the board there is support for sata drives in the official images the connector is suitable for both regular hard drives and ssd ones p.32
• The part of the schematic describing the sata module is shown below p.32
• Sata connector and power p.32
• Pay note the two jumpers 5v_e_sata and pc3 pb8 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 5v_e_sata there would always be 5v at the 5v_sata_pwr connector p.32
• Important the cables and the 0 5 connectors are very fragile if you attempt to disconnect the p.32
• Gpio connectors p.32
• For more information please visit https www olimex com products components cables sata cable set p.32
• Gpio 1 general purpose input output 40pin connector p.33
• Gpio 2 general purpose input output 40pin connector p.35
• 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 p.35
• Gpio 4 general purpose input output 20pin connector p.36
• Gpio 4 connector features the rest of the signals available and few additional signals that might need testing p.36
• Gpio 3 general purpose input output 40pin connector p.36
• 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 p.37
• The lcd connector is suitable for a number of olimex displays and touchscreen panels with different native resolution the smallest available is the 4 one called lcd olinuxino 4 ts with native screen resolution of 480 272 through the 7 one named lcd olinuxino 7ts with 800 480 to the 1024 600 10 lcd olinuxino 10ts typically you need a single cable for the connection between the board and the display p.37
• Please note that the smallest display 4 480 272 is not suitable for the official android images we provide p.37
• Lcd_con 40pin connector p.37
• Important the two rows of pins of lcd_con connector on a20 olinuxino lime2 are swapped compared to a20 olinuxino lime and a10 olinuxino lime p.37
• Important if you have an old display a13 lcdx xx you need additional adapter board and two different 40pin ribbon cables to connect an olimex display and the lcd_con p.37
• Full list of recommended displays for the board might be found in chapter 2 connecting and calibrating a display p.37
• 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 p.39
• Jumper description p.39
• Additional hardware components p.40
• Eagle schematic p.41
• Chapter 7 schematics p.41
• Introduction to the chapter p.41
• Physical dimensions p.42
• Note that all dimensions are in mils p.42
• Remember to check the schematics and the board design files to compare the differences p.43
• Introduction to the chapter p.43
• 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 p.43
• Document revision p.43
• Chapter 8 revision history and support p.43
• Board revision p.43
• Useful web links and purchase codes p.44
• Frequently asked questions p.45
• The full text might be found at https www olimex com wiki gtc warranty for future reference p.49
• Product support p.49
• Page 49 of 49 p.49
• Olimex 2015 a20 olinuxino lime2 user s manual p.49
• 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 p.49