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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.
== See also [[Hardware]] ==
OLPC has developed newer hardware generations [[XO-1.5]] and [[XO-1.75]] that share the XO-1's industrial design.
''Remove this section once the sidebar points to [[Hardware]] rather than here.''


== Specifications ==
=Hardware details for OLPC, November 30, 2006=
[[Image:drawing75c1.jpg|thumb|right]]
Maintained from a document written by Michael Bove by Jim Gettys.
[[Image:Olpc XO dim-Optimized.png|thumb|Dimensioned Drawing of XO, click to enlarge]]


The [[Media:CL1A_Hdwe_Design_Spec.pdf|definitive laptop specification]] is only available in PDF format. This page attempts to accurately reflect that information.
== Future Beta Test Systems ==
''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]].''


===Physical dimensions===
Several more builds of beta systems are planned for 2007.
* 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===
== Beta Test 1 Systems (BTest-1) ==
* A photo of the [[XO Motherboard|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;
** [http://www.amd.com/files/connectivitysolutions/geode/geode_lx/33234G_LX_databook.pdf 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;
** 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])
** South Bridge: [https://web.archive.org/web/20130626041210/http://support.amd.com/us/Embedded_TechDocs/33238G_cs5536_db.pdff datasheet]
* Graphics controller: Integrated with CPU; unified memory architecture;
* Embedded controller: ENE KB3700 or ENE KB3700B;
** [[Ec_specification|Embedded Controller]]: [[Media:KB3700-ds-01.pdf|ENE KB3700]]
* 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: [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]


[[Image:Proto-a-front.jpg|thumb|Prototype-A Motherboard]]
Approximately 875 systems were built by Quanta and are being 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]]. Some of the details of the hardware design are to support the [[OLPC Human Interface Guidelines]].
{{anchor|Display}}


=== Specifications ===
===Display===
{{main|Display}}
* [[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 [[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.
* 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).


: ''Note: web browser images are currently scaled up so that an image of very roughly [800 × 600] fills up the browser window.''
[[Image:drawing75c.png|thumb|right]]


[[Image:EToys - new display.jpg|thumb|right|[[Etoys]] running on the first OLPC display prototype]]
''Physical dimensions:''
* Dimensions: 242mm × 228mm × 30mm (approximate, subject to change)
* Weight: Less than 1.5 KG (target only—subject to change)
* Configuration: Convertible laptop with pivoting, reversible display; dirt- and moisture-resistant system enclosure


===Integrated peripherals===
[[Image:Proto-a-front.jpg|thumb|Prototype-A Motherboard]]
* Keyboard: 80+ keys, 1.0mm stroke; sealed rubber-membrane key-switch assembly;
''Core electronics:''
* CPU: [http://www.amd.com/us-en/ConnectivitySolutions/ProductInformation/0,,50_2330_9863_9864,00.html AMD Geode GX-500@1.0W]([http://www.amd.com/files/connectivitysolutions/geode/geode_gx/31505E_gx_databook.zip datasheet])
* CPU clock speed: 366 Mhz
* Compatibility: Athlon instruction set (including MMX and 3DNow! Enhanced) with additional Geode-specific instructions
* 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])
* Graphics controller: Integrated with Geode CPU; unified memory architecture
* Embedded controller (for production), ENE KB3700: [[Image:KB3700-ds-01.pdf]]
* DRAM memory: 128 MiB dynamic RAM
* Data rate: Dual – DDR266 – 133 Mhz
* BIOS: 1024KB SPI-interface flash ROM; LinuxBIOS open-source BIOS; Open Firmware bootloader
* Mass storage: 512 MiB SLC NAND flash, high speed flash controller
* Drives: No rotating media

''Display:''
* Liquid-crystal display: 7.5” Dual-mode TFT display
* Viewing area: 152.4 mm × 114.3 mm
* Resolution: 1200 (H) × 900 (V) resolution (200 dpi)
* Mono display: High-resolution, reflective monochrome mode
* Color display: Standard-resolution, quincunx-sampled, transmissive color mode
* [[Image:EToys - new display.jpg|thumb|right|eToys ([[Squeak]]) running on the OLPC display]]Special "[[DCON]]" chip, that enables deswizzling and anti-aliasing in color mode, while enabling the display to remain live with the processor suspended. Since we will always be running the frame buffer at 1200x900 resolution, the color resolution is lower, but exactly how this works out in effective resolution is very complex. Mary Lou Jepsen is planning to write document to explain the effective resolution, which is higher than if we simply reduced the size of the frame buffer and used the red, green and blue channels. Easiest, and most convincing, may be to measure it with appropriate test patterns; in the meanwhile, you can examine this photograph of the display (it looks even nicer in person; photographing a display is remarkably difficult).
''Integrated peripherals:''
[[Image:AP1 15.jpg|thumb|100px|Keyboard detail]]
* Keyboard: 70+ keys, 1.2mm stroke; sealed rubber-membrane key-switch assembly
** [[OLPC_Keyboard_layouts|Keyboard Layouts]]
** [[OLPC_Keyboard_layouts|Keyboard Layouts]]
** 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]]
** 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]]
* Cursor-control keys: five-key cursor-control pad; four directional keys plus Enter
* Gamepad: Two sets of four-direction cursor-control keys;
* Touchpad: Dual capacitance/resistive touchpad; supports written-input mode
* Touchpad: Capacitance touchpad
** ALPS Electric [[Touch Pad/Tablet|Dual capacitance/resistive touchpad]];
* 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
* Audio: AC’97 compatible audio subsystem; Internal stereo speakers and amplifier; internal monophonic microphone; jacks for external headphones or microphone;
* [[Wireless]]: Marvell [[Libertas]] 88W8388+88W8015, 802.11b/g compatible; dual adjustable, rotating coaxial antennas; supports diversity reception
** [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
* Status indicators: Power, battery, WiFi; visible lid open or closed
[[Image:AP1 15.jpg|thumb|100px|Keyboard detail]]
* Video camera: 640x480 resolution, 30FPS
* 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;
** [http://www.ovt.com/products/detail.php?id=73 Omnivision OV7670]
* [[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;
** Marvell [[Libertas]] wireless chipset, [[88W8388]] controller and [[88W8015]] radio
* 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#Mechanical|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.

[[Image:Rotate-1.jpg|thumb|Connectors]]
[[Image:Rotate-1.jpg|thumb|Connectors]]

''External connectors:''
===Battery===
* Power: 2-pin DC-input, 10 to 25 V, -23 to -10 V
* Pack type: 2 or 4 cells LiFePO4; or 5 cells NiMH, approx. 6V series configuration (subject to change);
* Line output: Standard 3.5mm 3-pin switched stereo audio jack
* Capacity: 16.5 Watt-hours (NIMH), 22 Watt-hours (LiFeP);
* Microphone: Standard 3.5mm 2-pin switched mono microphone jack; selectable sensor-input mode
* Fully-enclosed “hard” case; user removable;
* Expansion: 3 Type-A USB-2.0 connectors; SD Card slot
* Electronics integrated with the pack provide:
* Maximum power: 500 mA (total)
** Identification;
[[Image:Bottomdrawing.jpg|thumb|Battery]]
** Battery charge and capacity monitoring chip ([[Media:DS2756.pdf|Maxim DS2756 data sheet]]);
''Battery:''
** Thermal and over-current sensors along with cutoff switch to protect battery;
* Pack type: 5 Cells, 6V series configuration
* Minimum 2,000 charge/discharge cycles (to 50% capacity of new).
* Fully-enclosed “hard” case; user removable
* Capacity: 22.8 Watt-hours
* Cell type: NiMH
* Pack protection: Integrated pack-type identification
* Integrated thermal sensor
* Integrated polyfuse current limiter
* Cycle life: Minimum 2,000 charge/discharge cycles (to 50% capacity of new, IIRC).
* [[Power Management]] will be critical
* [[Power Management]] will be critical


See [[Laptop Batteries]] or more information.
''BIOS/loader:''
* [http://www.linuxbios.org/index.php/Main_Page LinuxBIOS] is our BIOS for production units; Open Firmware is used as the bootloader.


[[Image:Bottomdrawing.jpg|thumb|Battery]]
''Environmental specifications:''
* Temperature: somewhere in between typical laptop requirements and Mil spec; exact values have not been settled
* Humidity: Similar attitude to temperature. When closed, the unit should seal well enough that children walking to and from school need not fear rainstorms or dust.
* 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)
* 2mm plastic walls (1.3mm is typical for most systems).


===BIOS/loader===
''Regulatory requirements:''
* [[Open Firmware]] (including hardware initialization and fast resume).
* The usual US and EU EMI/EMC requirements will be met.
* Panasonic ML1220 battery
* The laptop and all OLPC-supplied accessories will be fully UL and is RoHS compliant.


===Environmental specifications===
== Pre-BTest boards ==
* Temperature: UL certification planned to 45C in Q32007, pending 50C certification in mid-2008;
* 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;
* 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===
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.]]
[[File:RoHS_Restriction_of_Hazardous_Substances_Directive_Logo.png|right|220px]]
* 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;
* [http://ec.europa.eu/environment/waste/rohs_eee/legis_en.htm RoHS (Restriction of Hazardous Substances Directive – EU) compliant.]


==Laptop Development Schedule==
== Alpha Test Prototype Electronics ==


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.
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.


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]]'''
Photographs:
* [[media:Proto-a-front.jpg|Component side OLPC circuit board]]
* [[media:Proto-a-back.jpg|Back side of the OLPC circuit board]]
* [[media:Proto-a-linux.jpg|Picture of Linux running with circuit board in the lab]]
* [[media:Proto-a-screen.jpg|Picture of the screen of Linux running on the OLPC circuit board; fittingly, it shows a Chinese desktop]]


== See also ==
==Serial Adapter==
[[Image:serialadapter.jpg|100px|right]]


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.
*[[Hardware]]


<br clear="all">
Formerly part of this page:
== Other Documents ==
*[[Hardware uniqueness]]
*[[Hardware design]]


* A complete [[Repair Parts]] List is under development.
* [[Media:XO-1_Schematics.pdf|Schematics]]

== See also ==
Formerly part of this page:
* [[Hardware uniqueness]]
* [[Hardware design]]
* [[Hardware modification]]


See also:
[[Category:hardware]]
* [[Hardware Testing]]: Safety Certifications and Robustness
[[Category:developers]]
* [[Hardware]]
* [[Support]]
* The '''[[Media:CL1_Hdwe_Design_Spec.pdf|definitive laptop specification]]''' (only available in PDF format).
[[category:Hardware]]
[[Category:XO-1]]

Latest revision as of 20:50, 15 July 2016

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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 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

Drawing75c1.jpg
Dimensioned Drawing of XO, click to enlarge

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;
  • 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;
    • North Bridge: PCI and Memory Interface integrated with Geode CPU (info)
    • South Bridge: datasheet
  • 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
Prototype-A Motherboard

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.
Etoys running on the first OLPC display prototype

Integrated peripherals

Keyboard detail
  • 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.
Connectors

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.

Battery

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

RoHS Restriction of Hazardous Substances Directive Logo.png
  • 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

Serialadapter.jpg

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.


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