one laptop per child

Physical dimensions

  • Approximate dimensions: 242mm×228mm×32mm;
  • Approximate weight: 1.45KG with LiFeP battery; 1.58KG with NiMH battery;
  • Configuration: Convertible laptop with pivoting, reversible display; dirt- and moisture-resistant system enclosure; no fan.

Core electronics

  • CPU: x86-compatible processor with 64KB each L1 I and D cache; at least 128KB L2 cache; AMD Geode LX-700@0.8W (datasheet);
  • CPU clock speed: 433 Mhz;
  • ISA compatibility: Support for both the MMX and 3DNow! x86 instruction-set extensions; Athlon 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; AMD CS5536 South Bridge (datasheet);
  • Graphics controller: Integrated with Geode CPU; unified memory architecture;
  • Embedded controller: ENE KB3700 or ENE KB3700B;
  • DRAM memory: 256 MiB dynamic RAM;
  • Data rate: Dual — DDR333 — 166 Mhz;
  • 1024KB SPI-interface flash ROM;
  • Mass storage: 1024 MiB SLC NAND flash, high-speed flash controller;
  • Drives: No rotating media;
  • CAFE ASIC (Camera, Flash Enabler chip, provides high-performance Camera, NAND FLASH and SD interfaces); Marvell 88ALP01: (CAFE specification).


  • Liquid-crystal display: 7.5” Dual-mode TFT display;
  • Viewing area: 152.4mm × 114.3mm;
  • Resolution: 1200 (H) × 900 (V) resolution (200 DPI);
  • Monochrome display: High-resolution, reflective sunlight-readable monochrome mode; Color display: Standard-resolution, Quincunx-sampled, transmissive color mode;
  • LCD power consumption: 0.1 Watt with backlight off; 0.2–1.0 Watt with backlight on;
  • The display-controller chip (DCON) with memory that enables the display to remain live with the processor suspended; the display and this chip are the basis of our extremely low power architecture; the display controller chip also enables de-swizzling and anti-aliasing in color mode.

Integrated peripherals

  • Keyboard: 80+ keys, 1.0mm stroke; sealed rubber-membrane key-switch assembly;
  • Keyboard layout details;
  • Keyboard layout pictures: international, Thai, Arabic, Spanish, Portuguese, West African, Urdu, Mongolian, Cyrillic, Amharic;
  • Gamepad: Two sets of four-direction cursor-control keys;
  • Touchpad: Dual capacitance/resistive touchpad; supports written-input mode; ALPS Electric Dual capacitive/resistive touchpad;
  • Audio: AC97-compatible audio audio subsystem; internal stereo speakers and amplifier; internal monophonic microphone; jacks for external headphones and microphone; Analog Devices AD1888 and Analog Devices SSM2211 for audio amplification;
  • Wireless networking: Integrated 802.11b/g (2.4GHz) interface; 802.11s (Mesh) networking supported; dual adjustable, rotating coaxial antennas; supports diversity reception; capable of mesh operation when CPU is powered down; Marvell Libertas 88W8388 controller and 88W8015 radio;
  • Status indicators: Power, battery, WiFi (2); visible when lid is open or closed; microphone in-use and camera in-use visible when lid is open;
  • Video camera: integrated color vision camera; 640×480 resolution at 30FPS; Omnivision OV7670.

External connectors

  • DC power: 6mm (1.65mm center pin) connector; 11 to 18 V input usable, –32 to 40 V input tolerated; power draw limited to 15 W;
  • 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: MMC/SD Card slot.


  • Pack type: 2 or 4 cells LiFePO4; or 5 cells NiMH, approximately 6V series configuration;
  • Capacity: 22.8 Watt-hours (LiFePO4); 16.5 Watt-hours (NiMH);
  • Fully-enclosed “hard” case; user removable;
  • Electronics integrated with pack provide:
  • Identification;
  • Battery charge and capacity information;
  • 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.


  • Open Firmware used to load the operating system.

Environmental specifications

  • Temperature: UL certification planned to 45C [as of 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 (non-operating);
  • 2mm plastic walls (1.3mm is typical for most systems).

Regulatory requirements

  • The usual US and EU EMI/EMC (Electromagnetic Interference and 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 also 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.
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bottom of XO, with battery pack removed

Bottom of XO, with battery pack removed

XO motherboard

XO motherboard