Centrino
Centrino, a platform-marketing initiative from Intel, covers a particular combination of CPU, mainboard chipset and wireless network interface in the design of a laptop personal computer. Intel claimed that systems equipped with these technologies should deliver better performance, longer battery life and broad wireless network interoperability.
To qualify for a Centrino label, laptop vendors must use all three Intel qualified parts, otherwise using only the processor and chipset will carry the Intel Core label instead.
Carmel platform (2003)
Intel used Carmel as the code name for the first-generation Centrino platform introduced in March 2003.
The Carmel platform consists of:
an Intel Pentium M processor (code-named Banias or later Dothan) with a 400 MT/s FSB, Socket 478 and
an Intel 855 series chipset (code-named Odem or Montara with Intel Extreme Graphics 2), DDR-266 and
an Intel PRO/Wireless 2100 or later 2200 (IEEE 802.11b) mini-PCI Wi-Fi adapter (code-named Calexico or Calexico2).
Industry-watchers initially criticized the Carmel platform for its lack of an IEEE 802.11g-solution, because many independent Wi-Fi chip-makers like Broadcom and Atheros had already started shipping 802.11g products. Intel responded that the IEEE had not finalized the 802.11g standard at the time of Carmel's launch, and that it did not want to launch products not based on a finalized standard.
In early 2004, after the finalization of the 802.11g standard, Intel permitted an Intel PRO/Wireless 2200BG (code-named Calexico2) to substitute for the 2100. At the same time, they permitted the new Dothan Pentium M to substitute for the Banias Pentium M. Initially, Intel permitted only the 855GM chipset, which did not support external graphics. Later, Intel allowed the 855GME and 855PM chips, which did support external graphics, in Centrino notebooks.
Despite criticisms, the Carmel platform won quick acceptance among OEMs and consumers. Carmel could attain or exceed the performance of older Pentium 4-M platforms, while allowing for notebooks to operate for 4 to 5 hours on a 48 W-h battery. Carmel also allowed notebook-manufacturers to create thinner and lighter notebooks because its components did not dissipate much heat, and thus did not require large cooling systems
Sonoma platform (2005)
Intel used Sonoma as the code name for the second-generation Centrino platform, introduced in January 2005.
The Sonoma platform consists of:
an Intel Pentium M processor (code-named Dothan) with a 533 MT/s FSB, Socket 479 and
an Intel Mobile 915 Express series chipset (code-named Alviso with Intel's GMA 900), DDR2-533 and
the Intel PRO/Wireless 2200 or 2915ABG mini-PCI Wi-Fi adapter (code-named Calexico2).
The Mobile 915 Express chipset, like its desktop version, supports many new features such as DDR2, PCI Express, Intel High Definition Audio, and SATA. Unfortunately, the introduction of PCI Express and faster Pentium M processors causes notebooks built around the Sonoma platform to have a shorter battery-life than their Carmel counterparts; Sonoma notebooks typically achieve between 3.5-4.6 hours of battery-life on a 53 W-h battery.
