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The '''XO-1''' laptop is a central focus of One Laptop Per Child. After three years of development, it entered mass production in November 2007. There are now [[Deployments|millions of units deployed in the field]], and thousands more with developers and for testing in schools all over the world. |
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=Hardware= |
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OLPC has developed newer hardware generations [[XO-1.5]] and [[XO-1.75]] that share the XO-1's industrial design. |
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== Specifications == |
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The XO laptop is the center of One Laptop Per Child. After two years of development, it is approaching mass production, with several thousand Beta test (B2) units deployed to developers and for testing in schools in participating countries. The laptop design has just undergone a final minor update to keep up with advancements in technology. |
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[[Image:drawing75c1.jpg|thumb|right]] |
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[[Image:Olpc XO dim-Optimized.png|thumb|Dimensioned Drawing of XO, click to enlarge]] |
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The [[Media:CL1A_Hdwe_Design_Spec.pdf|definitive laptop specification]] is only available in PDF format. This page attempts to accurately reflect that information. |
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=== Specifications === |
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''Note: this is the specification of the CL1A XO-1 production laptop. The specification for the earlier CL1 version (with the wide dual-mode touchpad) is [[Media:CL1_Hdwe_Design_Spec.pdf|here]].'' |
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===Physical dimensions=== |
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[[Image:drawing75c1.jpg|thumb|right]] |
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* Approximate dimensions: 242mm × 228mm × 32mm (see drawing to the right for detailed dimensions) |
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* Approximate weight: |
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** XO laptop with LiFePO4 battery: 1.45KG (~3.20lbs); |
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** XO laptop with NiMH battery: 1.58KG (~3.48lbs); |
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* Configuration: Convertible laptop with pivoting, reversible display; dirt- and moisture-resistant system enclosure; no fan. |
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===Core electronics=== |
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''Physical dimensions:'' |
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* A photo of the [[XO Motherboard|XO-1 motherboard]] is available, with or without annotations. |
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* Dimensions: 242mm × 228mm × 30mm (approximate, subject to change) |
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* CPU: x86-compatible processor with 64KB each L1 I and D cache; at least 128KB L2 cache; |
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* Weight: Less than 1.5 KG (target only—subject to change) |
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** [http://www.amd.com/files/connectivitysolutions/geode/geode_lx/33234G_LX_databook.pdf Datasheet] (dead link) |
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* Configuration: Convertible laptop with pivoting, reversible display; dirt- and moisture-resistant system enclosure |
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* CPU clock speed: 433 Mhz; |
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* i586 instruction set (including MMX and 3DNow! Enhanced) with additional Geode-specific instructions |
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''Core electronics:'' |
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* Companion chips: PCI and memory interface integrated with CPU; |
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* CPU: [http://www.amd.com/us-en/assets/content_type/DownloadableAssets/33358e_lx_900_productb.pdf AMD Geode LX-700@0.8W] |
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** North Bridge: PCI and Memory Interface integrated with Geode CPU ([https://web.archive.org/web/20061019093748/http://www.amd.com/files/connectivitysolutions/geode/geode_lx/33234d_lx_ds.pdf info]) |
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* CPU clock speed: 433 Mhz |
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** South Bridge: [https://web.archive.org/web/20130626041210/http://support.amd.com/us/Embedded_TechDocs/33238G_cs5536_db.pdff datasheet] |
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* Compatibility: Athlon instruction set (including MMX and 3DNow! Enhanced) with additional Geode-specific instructions |
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* Graphics controller: Integrated with CPU; unified memory architecture; |
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* Chipset: [http://www.amd.com/us-en/ConnectivitySolutions/ProductInformation/0,,50_2330_9863_9864%5E13054,00.html AMD CS5536 South Bridge] ([http://www.amd.com/files/connectivitysolutions/geode/geode_lx/33238f_cs5536_ds.zip datasheet]) |
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* |
* Embedded controller: ENE KB3700 or ENE KB3700B; |
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* Embedded |
** [[Ec_specification|Embedded Controller]]: [[Media:KB3700-ds-01.pdf|ENE KB3700]] |
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* DRAM memory: 256 MiB dynamic RAM |
* DRAM memory: 256 MiB dynamic RAM; data rate: dual-DDR333-166Mhz; |
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* BIOS: 1024KiB SPI-interface flash ROM; |
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* Data rate: Dual – DDR266 – 133 Mhz |
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* Open Firmware used to load the operating system; |
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* BIOS: 1024KB SPI-interface flash ROM; LinuxBIOS open-source BIOS; Open Firmware bootloader |
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* Mass storage: 1024 MiB SLC NAND flash |
* Mass storage: 1024 MiB SLC NAND flash; (a few "Red XOs" have been built with 2048 MiB of flash) |
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* Drives: No rotating media |
* Drives: No rotating media. |
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* CAFE ASIC (camera- and flash-enabler chip provides high-performance camera, NAND FLASH and SD interfaces); Marvell 88ALP01: [http://www.marvell.com/products/pcconn/88ALP01.jsp CAFE Specification] or [http://wiki.laptop.org/images/5/5c/88ALP01_Datasheet_July_2007.pdf local copy] plus [http://dev.laptop.org/ticket/1339#comment:17 presence detect erratum] |
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[[Image:Proto-a-front.jpg|thumb|Prototype-A Motherboard]] |
[[Image:Proto-a-front.jpg|thumb|Prototype-A Motherboard]] |
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{{anchor|Display}} |
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* Liquid-crystal display: 7.5” Dual-mode TFT display |
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===Display=== |
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* Viewing area: 152.4 mm × 114.3 mm |
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{{main|Display}} |
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* Resolution: 1200 (H) × 900 (V) resolution (200 dpi) |
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* [[Display | Liquid-crystal display]]: 7.5” dual-mode TFT display; |
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* Mono display: High-resolution, reflective monochrome mode |
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* Viewing area: 152.4 mm × 114.3 mm; |
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* Color display: 800 (H) x 600 (V) or greater transmissive color mode |
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* Two "modes" depending on lighting conditions: |
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* Power Consumtion: 0.1 Watt with backlight off; 0.2-1.0 Watt with backlight on |
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:(1) Grayscale (B&W) reflective mode: for outdoor use—sunlight-readable; primarily lit from the front by ambient light; high-resolution (200 DPI), 1200(H) × 900(V) grayscale pixels; power consumption 0.1–0.2Watts; |
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* Timing Controller Chip with memory that enables the display to remain live with the processor suspended. This display and chip are the basis of our extremely low power architecture. The machine can be running with the CPU and much of the motherboard turned off. The timing controller chip also enables deswizzling and anti-aliasing in color mode. You can examine this photograph of the display (it looks even nicer in person; photographing a display is remarkably difficult). |
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:(2) Color, backlight mode: for indoor use; primarily lit from behind by the LED backlight; built in sub-pixel sampling of the displayed color information results in a perceived resolution of at least 1024(H) × 768(V); power consumption 0.2–1.0Watts; |
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[[Image:EToys - new display.jpg|thumb|right|eToys ([[Squeak]])running on the OLPC display]] |
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* The [[DCON|display-controller chip (DCON)]] with memory that enables the display to remain live with the processor suspended. The DCON also formats data for the display. |
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''Integrated peripherals:'' |
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* This [[Display | Liquid-crystal display]] is the basis of our extremely low power architecture. The XO is usable while the CPU and much of the motherboard is regularly turned off (and on) so quickly that it's imperceptible to the user. Huge power savings are harvested in this way (e.g. by turning stuff on the motherboard off when it's not being used (if even for a few seconds), while keeping the display on). |
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: ''Note: web browser images are currently scaled up so that an image of very roughly [800 × 600] fills up the browser window.'' |
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[[Image:EToys - new display.jpg|thumb|right|[[Etoys]] running on the first OLPC display prototype]] |
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* Keyboard: 70+ keys, 1.2mm stroke; sealed rubber-membrane key-switch assembly |
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===Integrated peripherals=== |
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* Keyboard: 80+ keys, 1.0mm stroke; sealed rubber-membrane key-switch assembly; |
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** [[OLPC_Keyboard_layouts|Keyboard Layouts]] |
** [[OLPC_Keyboard_layouts|Keyboard Layouts]] |
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** Layout pictures: [[:Image:Keyboard english.png|English]], [[:Image:Keyboard arabic.png|Arabic]], [[:Image:Keyboard thai.png|Thai]], [[:Image:NG-MP-alt.png|West African (Nigeria)]], [[:Image:BR-MP-v1.png|Portuguese]], [[:Image:ES-MP-v1.png|Spanish]], [[:Image:Ethiopic-B3.png|Amharic]], [[:Image:Rwanda-B3.png|French]], [[:Image:Urdu-MP.png|Urdu]], [[:Image:RU-MP-v1.png|Cyrillic]], [[:Image:TR-MP-v1.png|Turkish (not final)]], [[:Image:NP-MP-v1.png|Nepali]], [[:Image:MO-MP-v1.png|Mongolian]], [[:Image:KA-MP-v1.png|Kazakh]], [[:Image:MR-MP-v2.png|Devanagari]], [[:Image:UZ-MP.png|Uzbek]], [[:Image:PS-MP.png|Pashto]], [[:Image:AF-MP.png|Dari]], [[:Image:FF-MP.png|Pulaar (Fula)]], [[:Image:IT-MP.png|Italian]] |
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** Layout pictures - [[:Image:Keyboard_layout.jpg|US International]], [[:Image:Keyboard thai.jpg|Thai]], [[:Image:Keyboard arabic.jpg|Arabic]], [[:Image:Keyboard argentina.jpg|Spanish]], [[:Image:Keyboard brazil.jpg|Portuguese]], [[:Image:Keyboard nigeria.jpg|Nigeria]] |
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* |
* Gamepad: Two sets of four-direction cursor-control keys; |
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* Touchpad: |
* Touchpad: Capacitance touchpad |
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** ALPS Electric [[Touch Pad/Tablet|Dual capacitance/resistive touchpad]]; |
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* Audio: [http://www.analog.com/en/prod/0%2C2877%2CAD1888%2C00.html Analog Devices AD1888], AC97-compatible audio codec; stereo, with dual internal speakers; monophonic, with internal microphone and using the [http://www.analog.com/en/prod/0%2C2877%2CSSM2211%2C00.html Analog Devices SSM2211] for audio amplification |
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* Audio: AC’97 compatible audio subsystem; Internal stereo speakers and amplifier; internal monophonic microphone; jacks for external headphones or microphone; |
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** [http://www.analog.com/en/prod/0%2C2877%2CAD1888%2C00.html Analog Devices AD1888] and [http://www.analog.com/en/audiovideo-products/audio-amplifiers/ssm2302/products/product.html Analog Devices SSM2302] for audio amplification |
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[[Image:AP1 15.jpg|thumb|100px|Keyboard detail]] |
[[Image:AP1 15.jpg|thumb|100px|Keyboard detail]] |
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* Camera: integrated color video camera; 640 x 480 resolution at 30 FPS; independent (and undefeatable by software) display of microphone and camera recording status; the camera and device driver support disabling AGC and automatic color balancing, to enable its use as a photometric sensor for educational applications; |
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* [[Wireless]]: Marvell [[Libertas]] 88W8388+88W8015, 802.11b/g compatible; dual adjustable, rotating coaxial antennas; supports diversity reception |
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** [http://www.ovt.com/products/detail.php?id=73 Omnivision OV7670] |
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* Status indicators: Power, battery, WiFi; visible lid open or closed |
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* [[Wireless| Wireless Networking]]: Integrated 802.11b/g (2.4GHz) interface; 802.11s (Mesh) networking supported; dual adjustable, rotating antennas support diversity reception; capable of mesh operation when CPU is powered down; |
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* Video camera: 640x480 resolution, 30FPS |
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** Marvell [[Libertas]] wireless chipset, [[88W8388]] controller and [[88W8015]] radio |
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* Status indicators: Power, battery, and WiFi (2), visible with lid open or closed; Microphone In-Use, and Camera In-Use, visible when lid is open. |
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===External connectors=== |
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* DC power: 6mm (1.65mm center pin) connector; 11 to 18 V input usable, –32 to +40V input tolerated; power draw limited to 17 W; - see power connector dimensions at [[Battery and power#Mechanical|Battery and power]]. |
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* Headphone output: standard 3.5mm 3-pin switched stereo audio jack; |
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* Microphone input: standard 3.5mm 2-pin switched mono microphone jack; selectable 2V DC bias; selectable sensor-input mode (DC or AC coupled); |
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* USB: Three Type-A USB 2.0 connectors; Up to 1A power supplied (total); |
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* Flash Expansion: [[SD]] Card slot. |
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''External connectors:'' |
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* Power: 2-pin DC-input, 10 to 25 V, -23 to -10 V |
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* Line output: Standard 3.5mm 3-pin switched stereo audio jack |
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* Microphone: Standard 3.5mm 2-pin switched mono microphone jack; selectable sensor-input mode |
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* Expansion: 3 Type-A USB-2.0 connectors; SD Card slot |
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* Maximum power: 500 mA (total) |
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[[Image:Rotate-1.jpg|thumb|Connectors]] |
[[Image:Rotate-1.jpg|thumb|Connectors]] |
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===Battery=== |
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* Pack type: 5 |
* Pack type: 2 or 4 cells LiFePO4; or 5 cells NiMH, approx. 6V series configuration (subject to change); |
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* Capacity: 16.5 Watt-hours (NIMH), 22 Watt-hours (LiFeP); |
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* Fully-enclosed “hard” case; user removable |
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* Fully-enclosed “hard” case; user removable; |
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* Capacity: 22.8 Watt-hours |
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* Electronics integrated with the pack provide: |
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* Cell type: NiMH |
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** Identification; |
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* Pack protection: Integrated pack-type identification |
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** Battery charge and capacity monitoring chip ([[Media:DS2756.pdf|Maxim DS2756 data sheet]]); |
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* Integrated thermal sensor |
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** Thermal and over-current sensors along with cutoff switch to protect battery; |
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* Integrated polyfuse current limiter |
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* |
* Minimum 2,000 charge/discharge cycles (to 50% capacity of new). |
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* [[Power Management]] will be critical |
* [[Power Management]] will be critical |
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See [[Laptop Batteries]] or more information. |
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[[Image:Bottomdrawing.jpg|thumb|Battery]] |
[[Image:Bottomdrawing.jpg|thumb|Battery]] |
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===BIOS/loader=== |
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* [[Open Firmware]] (including hardware initialization and fast resume). |
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* [http://www.linuxbios.org/index.php/Main_Page LinuxBIOS] is our BIOS for production units; Open Firmware is used as the bootloader. |
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* Panasonic ML1220 battery |
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===Environmental specifications=== |
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* Temperature: UL certification planned to 45C in Q32007, pending 50C certification in mid-2008; |
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* Temperature: somewhere in between typical laptop requirements and Mil spec; exact values have not been settled |
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* Humidity: |
* Humidity: UL certification planned to [[IP_Code|IP42]] (perhaps higher) when closed, the unit should seal well enough that children walking to and from school need not fear rainstorms and dust; |
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* |
* Maximum altitude: –15m to 3048m (14.7 to 10.1 PSIA) (operating), –15m to 12192m (14.7 to 4.4 PSIA) (non-operating); |
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* Shock |
* Shock 125g, 2ms, half-sine (operating) 200g, 2ms, half-sine (non-operating); |
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* Random vibration: 0.75g zero-to-peak, 10Hz to 500Hz, 0.25 oct/min sweep rate (operating); 1.5g zero-to-peak, 10Hz to 500Hz, 0.5 oct/min sweep rate (nonoperating) |
* Random vibration: 0.75g zero-to-peak, 10Hz to 500Hz, 0.25 oct/min sweep rate (operating); 1.5g zero-to-peak, 10Hz to 500Hz, 0.5 oct/min sweep rate (nonoperating); |
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* |
* 2-3mm plastic walls (1.3mm is typical for most systems). |
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===Regulatory requirements=== |
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[[File:RoHS_Restriction_of_Hazardous_Substances_Directive_Logo.png|right|220px]] |
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* The usual US and EU EMI/EMC requirements will be met. |
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* The usual US and EU EMI/EMC (electromagnetic-interference and electromagnetic-compatibility) requirements will be met; |
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* The laptop and all OLPC-supplied accessories will be fully UL and is RoHS compliant. |
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* The laptop meets IEC 60950-1, EN 60950-1, and CSA/UL 60950-1 specifications. It also complies with UL 1310 and UL 498. In order to guarantee the safety of children using the laptop, it passes ASTM F 963; |
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* The external power adapter complies with IEC, EN, and CSA/UL 60950-1; |
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* The removable battery pack complies with IEC, EN, and CSA/UL 60950-1 and UL 2054; |
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* [http://ec.europa.eu/environment/waste/rohs_eee/legis_en.htm RoHS (Restriction of Hazardous Substances Directive – EU) compliant.] |
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==Laptop Development Schedule== |
==Laptop Development Schedule== |
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On April 15, 2006, the first prototypes of the [[XO]], the [[XO_A|A1]] prototype boards, were first powered on. Development continued with the [[XO_B1|B1]], the first complete prototype laptop, in November of 2006. The [[XO_B2|B2]] laptops were the first to incorporate the CaFE chip, and was produced in small quantities for initial trials in January 2007. In April of 2008 the design was refreshed with a faster processor and more memory/NAND flash. The [[XO_B3|B3]] prototypes were the first test of this design. Slight refinements were incorporated into the [[XO_B4|B4]], manufactured in June 2008, which is very similar to the production version of the laptop. Finally, mass production started in November 2007 with the [[XO_C2|C2]] version. |
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The XO laptop hardware development schedule has two more test unit builds (Beta Test 3 and Beta Test 4), before a final test build (C Test 1) on the final production line and mass production. The Beta Test 3 build scheduled for early May will be the first one providing the processor and memory capabilities of the production version. |
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Each prototype and production version is described in more detail separately: [[XO_A|A1]], [[XO_B1|B1]], [[XO_B2|B2]], [[XO_B3|B3]], [[XO_B4|B4]], [[XO_C1|C1]], '''[[XO_C2|C2]]''' |
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=== Pre-production Test Systems (CTest-1, or C1) === |
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==Serial Adapter== |
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This build is a very small number (200 or so) of laptops produced as a test of the manufacturing process on the main production line, and should happen in early fall. A C1 laptop is hopefully identical to a production unit in all aspects... |
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[[Image:serialadapter.jpg|100px|right]] |
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In order to conserve parts/space, while the motherboard does provide two serial ports for debugging (one populated in production), it does not provide voltage translators to fully implement the RS-232 protocol. Thus a [[Serial_adapters|3.3V TTL to RS-232 (or USB) Adapter]] is needed. |
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=== Beta Test 4 Systems (BTest-4, or B4) === |
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<br clear="all"> |
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This build, scheduled for the middle of the summer, is the final chance to fix hardware and mechanical problems that were detected in the Beta Test 3 build of the XO. Only a small number (200 or so) of these will be built for testing, as the injection molds for the plastic case have to be taken offline and duplicated to prepare for mass production (the Beta Test mold set will be retired after duplication). |
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== Other Documents == |
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* A complete [[Repair Parts]] List is under development. |
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No new features will be added to the laptop in this build. This build is planned merely to test solutions to problems detected in the BTest-3 laptops. |
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* [[Media:XO-1_Schematics.pdf|Schematics]] |
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=== Beta Test 3 Systems (BTest-3, or B3) === |
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This build, scheduled for May, is the first to use an updated design for the laptop. |
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Noticeable improvements over BTest-2 include: |
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* A faster, lower power processor: the Geode LX-700 |
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** 128 KB of L1 Cache, 128 KB of L2 Cache (vs. 32 KB of L1 cache) |
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** Faster processor and memory clock (433/333 vs. 366/266) |
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** 1.5 W typ. vs. 3 W typ. |
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* More memory: 256 MB of SDRAM (vs. 128 MB) |
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* A new hinge design allows greater tilt of the screen |
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* An improved case design (addressing strength and water resistance) |
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A very small number of BTest-3 units (around a hundred) will be built, all destined for hardware and low level software development. |
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=== Beta Test 2 Systems (BTest-2, or B2) === |
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Approximately 2500 systems were built by Quanta and are being distributed. These are fully functional machines with CaFE asic's, and reflect some, but not all of the learning and improvements from testing of BTest-1. Much more information about the BTest-2 systems can be found in the [[BTest-2 Release Notes]]. Some of the details of the hardware design are to support the [[OLPC Human Interface Guidelines]]. |
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BTest-2 systems are almost identical visually with BTest-1. BTest-3 will have more substantial physical differences. An easy way to tell the difference between BTest-1 and BTest-2 is that BTest-1 keyboards have white lettering, and BTest-2 has black lettering. |
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=== Beta Test 1 Systems (BTest-1) === |
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Approximately 875 systems were built by Quanta and were distributed. These are fully functional machines, but built before the rigorous testing that will now take place. Much more information about the BTest-1 systems can be found in the [[BTest-1 Release Notes]]. |
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=== Pre-BTest boards === |
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A small number of pre-BTest boards were built in preparation for building complete BTest systems. [[Btest_Boards|Developer information about B-test boards are here.]] |
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=== Alpha Test Prototype Electronics === |
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Power up of the first OLPC electronics prototype boards occurred April 15, 2006. Power and ground testing continued over the weekend, and formal debug and BIOS bring up started Monday, April 17, 2006 at Quanta Computer's labs in Taipei, Taiwan. By Wednesday, April 19, Linux was booting on the first generation prototypes. |
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Photographs: |
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* [[media:Proto-a-front.jpg|Component side OLPC circuit board]] |
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* [[media:Proto-a-back.jpg|Back side of the OLPC circuit board]] |
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* [[media:Proto-a-linux.jpg|Picture of Linux running with circuit board in the lab]] |
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* [[media:Proto-a-screen.jpg|Picture of the screen of Linux running on the OLPC circuit board; fittingly, it shows a Chinese desktop]] |
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== See also == |
== See also == |
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*[[Hardware]] |
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Formerly part of this page: |
Formerly part of this page: |
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*[[Hardware uniqueness]] |
* [[Hardware uniqueness]] |
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*[[Hardware design]] |
* [[Hardware design]] |
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* [[Hardware modification]] |
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See also: |
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[[Category:hardware]] |
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* [[Hardware Testing]]: Safety Certifications and Robustness |
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[[Category:developers]] |
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* [[Hardware]] |
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* [[Support]] |
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* The '''[[Media:CL1_Hdwe_Design_Spec.pdf|definitive laptop specification]]''' (only available in PDF format). |
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[[category:Hardware]] |
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[[Category:XO-1]] |
Latest revision as of 20:50, 15 July 2016
deutsch | english | español | français | italian | 日本語 | 한글 | português | русский indonesia | HowTo [ID# 298833] +/- |
The XO-1 laptop is a central focus of One Laptop Per Child. After three years of development, it entered mass production in November 2007. There are now millions of units deployed in the field, and thousands more with developers and for testing in schools all over the world. OLPC has developed newer hardware generations XO-1.5 and XO-1.75 that share the XO-1's industrial design.
Specifications
The definitive laptop specification is only available in PDF format. This page attempts to accurately reflect that information. Note: this is the specification of the CL1A XO-1 production laptop. The specification for the earlier CL1 version (with the wide dual-mode touchpad) is here.
Physical dimensions
- Approximate dimensions: 242mm × 228mm × 32mm (see drawing to the right for detailed dimensions)
- Approximate weight:
- XO laptop with LiFePO4 battery: 1.45KG (~3.20lbs);
- XO laptop with NiMH battery: 1.58KG (~3.48lbs);
- Configuration: Convertible laptop with pivoting, reversible display; dirt- and moisture-resistant system enclosure; no fan.
Core electronics
- A photo of the XO-1 motherboard is available, with or without annotations.
- CPU: x86-compatible processor with 64KB each L1 I and D cache; at least 128KB L2 cache;
- Datasheet (dead link)
- CPU clock speed: 433 Mhz;
- i586 instruction set (including MMX and 3DNow! Enhanced) with additional Geode-specific instructions
- Companion chips: PCI and memory interface integrated with CPU;
- Graphics controller: Integrated with CPU; unified memory architecture;
- Embedded controller: ENE KB3700 or ENE KB3700B;
- DRAM memory: 256 MiB dynamic RAM; data rate: dual-DDR333-166Mhz;
- BIOS: 1024KiB SPI-interface flash ROM;
- Open Firmware used to load the operating system;
- Mass storage: 1024 MiB SLC NAND flash; (a few "Red XOs" have been built with 2048 MiB of flash)
- Drives: No rotating media.
- CAFE ASIC (camera- and flash-enabler chip provides high-performance camera, NAND FLASH and SD interfaces); Marvell 88ALP01: CAFE Specification or local copy plus presence detect erratum
Display
- Main article: Display
- Liquid-crystal display: 7.5” dual-mode TFT display;
- Viewing area: 152.4 mm × 114.3 mm;
- Two "modes" depending on lighting conditions:
- (1) Grayscale (B&W) reflective mode: for outdoor use—sunlight-readable; primarily lit from the front by ambient light; high-resolution (200 DPI), 1200(H) × 900(V) grayscale pixels; power consumption 0.1–0.2Watts;
- (2) Color, backlight mode: for indoor use; primarily lit from behind by the LED backlight; built in sub-pixel sampling of the displayed color information results in a perceived resolution of at least 1024(H) × 768(V); power consumption 0.2–1.0Watts;
- The display-controller chip (DCON) with memory that enables the display to remain live with the processor suspended. The DCON also formats data for the display.
- This Liquid-crystal display is the basis of our extremely low power architecture. The XO is usable while the CPU and much of the motherboard is regularly turned off (and on) so quickly that it's imperceptible to the user. Huge power savings are harvested in this way (e.g. by turning stuff on the motherboard off when it's not being used (if even for a few seconds), while keeping the display on).
- Note: web browser images are currently scaled up so that an image of very roughly [800 × 600] fills up the browser window.
![](/mediawiki/images/thumb/0/00/EToys_-_new_display.jpg/300px-EToys_-_new_display.jpg)
Integrated peripherals
- Keyboard: 80+ keys, 1.0mm stroke; sealed rubber-membrane key-switch assembly;
- Keyboard Layouts
- Layout pictures: English, Arabic, Thai, West African (Nigeria), Portuguese, Spanish, Amharic, French, Urdu, Cyrillic, Turkish (not final), Nepali, Mongolian, Kazakh, Devanagari, Uzbek, Pashto, Dari, Pulaar (Fula), Italian
- Gamepad: Two sets of four-direction cursor-control keys;
- Touchpad: Capacitance touchpad
- ALPS Electric Dual capacitance/resistive touchpad;
- Audio: AC’97 compatible audio subsystem; Internal stereo speakers and amplifier; internal monophonic microphone; jacks for external headphones or microphone;
- Analog Devices AD1888 and Analog Devices SSM2302 for audio amplification
- Camera: integrated color video camera; 640 x 480 resolution at 30 FPS; independent (and undefeatable by software) display of microphone and camera recording status; the camera and device driver support disabling AGC and automatic color balancing, to enable its use as a photometric sensor for educational applications;
- Wireless Networking: Integrated 802.11b/g (2.4GHz) interface; 802.11s (Mesh) networking supported; dual adjustable, rotating antennas support diversity reception; capable of mesh operation when CPU is powered down;
- Status indicators: Power, battery, and WiFi (2), visible with lid open or closed; Microphone In-Use, and Camera In-Use, visible when lid is open.
External connectors
- DC power: 6mm (1.65mm center pin) connector; 11 to 18 V input usable, –32 to +40V input tolerated; power draw limited to 17 W; - see power connector dimensions at Battery and power.
- Headphone output: standard 3.5mm 3-pin switched stereo audio jack;
- Microphone input: standard 3.5mm 2-pin switched mono microphone jack; selectable 2V DC bias; selectable sensor-input mode (DC or AC coupled);
- USB: Three Type-A USB 2.0 connectors; Up to 1A power supplied (total);
- Flash Expansion: SD Card slot.
Battery
- Pack type: 2 or 4 cells LiFePO4; or 5 cells NiMH, approx. 6V series configuration (subject to change);
- Capacity: 16.5 Watt-hours (NIMH), 22 Watt-hours (LiFeP);
- Fully-enclosed “hard” case; user removable;
- Electronics integrated with the pack provide:
- Identification;
- Battery charge and capacity monitoring chip (Maxim DS2756 data sheet);
- Thermal and over-current sensors along with cutoff switch to protect battery;
- Minimum 2,000 charge/discharge cycles (to 50% capacity of new).
- Power Management will be critical
See Laptop Batteries or more information.
BIOS/loader
- Open Firmware (including hardware initialization and fast resume).
- Panasonic ML1220 battery
Environmental specifications
- Temperature: UL certification planned to 45C in Q32007, pending 50C certification in mid-2008;
- Humidity: UL certification planned to IP42 (perhaps higher) when closed, the unit should seal well enough that children walking to and from school need not fear rainstorms and dust;
- Maximum altitude: –15m to 3048m (14.7 to 10.1 PSIA) (operating), –15m to 12192m (14.7 to 4.4 PSIA) (non-operating);
- Shock 125g, 2ms, half-sine (operating) 200g, 2ms, half-sine (non-operating);
- Random vibration: 0.75g zero-to-peak, 10Hz to 500Hz, 0.25 oct/min sweep rate (operating); 1.5g zero-to-peak, 10Hz to 500Hz, 0.5 oct/min sweep rate (nonoperating);
- 2-3mm plastic walls (1.3mm is typical for most systems).
Regulatory requirements
- The usual US and EU EMI/EMC (electromagnetic-interference and electromagnetic-compatibility) requirements will be met;
- The laptop meets IEC 60950-1, EN 60950-1, and CSA/UL 60950-1 specifications. It also complies with UL 1310 and UL 498. In order to guarantee the safety of children using the laptop, it passes ASTM F 963;
- The external power adapter complies with IEC, EN, and CSA/UL 60950-1;
- The removable battery pack complies with IEC, EN, and CSA/UL 60950-1 and UL 2054;
- RoHS (Restriction of Hazardous Substances Directive – EU) compliant.
Laptop Development Schedule
On April 15, 2006, the first prototypes of the XO, the A1 prototype boards, were first powered on. Development continued with the B1, the first complete prototype laptop, in November of 2006. The B2 laptops were the first to incorporate the CaFE chip, and was produced in small quantities for initial trials in January 2007. In April of 2008 the design was refreshed with a faster processor and more memory/NAND flash. The B3 prototypes were the first test of this design. Slight refinements were incorporated into the B4, manufactured in June 2008, which is very similar to the production version of the laptop. Finally, mass production started in November 2007 with the C2 version.
Each prototype and production version is described in more detail separately: A1, B1, B2, B3, B4, C1, C2
Serial Adapter
In order to conserve parts/space, while the motherboard does provide two serial ports for debugging (one populated in production), it does not provide voltage translators to fully implement the RS-232 protocol. Thus a 3.3V TTL to RS-232 (or USB) Adapter is needed.
Other Documents
- A complete Repair Parts List is under development.
- Schematics
See also
Formerly part of this page:
See also:
- Hardware Testing: Safety Certifications and Robustness
- Hardware
- Support
- The definitive laptop specification (only available in PDF format).