Project Analog - March 2008 - (Page 9)

mcP2551 to become wireless experts and provides interoperability with other manufacturers’ products. The spectrum used by the wireless technology can greatly affect the countries in which the product is allowed to operate. Bluetooth, ZigBee, and 802.11 are all narrowband technologies that operate in either the 2.4- or 5-GHz frequency band. Along with 900 MHz, these frequencies are known as the ISM radio bands (for industrial, scientific, and medical), and are generally legal to use anywhere in the world. ZigBee is designed for extremely low power consumption and very low average data rates, suitable for sensor networks and other small devices where long battery life is important. This article will focus on the higher bandwidth technologies needed for printers, cameras, and external storage devices. Ultra-wideband (UWB) radios such as those based on the WiMedia Alliance’s UWB radio platform are different in that they operate over The MCP2551 is a high-speed CAN transceiver, fault-tolerant device that serves as the interface between a CAN protocol controller and the physical bus. The MCP2551 provides differential transmit and receive capability for the CAN protocol controller and is fully compatible with the ISO-11898 standard, including 24V requirements. It will operate at speeds of up to 1 Mb/s. Features: • Slope control input • Supports 1 Mb/s operation • Implements ISO-11898 standard physical layer requirements • Suitable for 12V and 24V systems • Externally-controlled slope for reduced RFI emissions • Permanent dominant detect • Low current standby operation • High noise immunity due to differential bus implementation For more information, click here. licensed frequencies but at an extremely low transmission power. In the United States, UWB radios operate at –41.25 dBm/MHz in the 3.1 to 10.6-GHz frequency range. Because of the low power levels involved, UWB radios should not interfere with the primary users of the licensed frequencies or with any other wireless technology. UWB can serve as a radio platform with Bluetooth, USB, or WiNet protocols. Currently, products based on UWB are only legal for sale in the United States. Japan, Korea, China, and Europe are expected to follow within the next year. time to market is CritiCal For products that will ship in volume to customers in the next 6-9 months, the use of a mature, well-established, and cost-reduced technology such as 802.11b or Bluetooth is appropriate. Emerging and future technologies like 802.11n and Certified Wireless USB have much to offer, but they will not be ready for volume shipment until next year. Often, the target operating environment will make the decision easy. If you are building a peripheral for a cellular phone—say a wireless hands-free headset—then interoperability with the existing installed base of cell phones is an important requirement. Bluetooth is currently the most widely supported cell phone peripheral wireless connection. Most cell phone manufacturers have Wireless USB on their roadmaps, but those products will not be widely deployed for some time. Similarly, 802.11b and 802.11g are the most widely deployed in consumer homes, and 802.11a, 802.11b, and 802.11g are the most common in offices. Although they are common in the home and enterprise, 802.11-based protocols have their origins in data networking and their principal purpose is to carry Internet Protocol (IP) traffic. 802.11 products must implement an IP stack and are expected to function as network devices. This is no big deal for network cards, Contents Viewpoint Wireless Communication Using IrDA® Wireless Design Choices Advanced Communication Solutions for Lighting Analog news Microchip analog page Interface products overview Sample center microchipDIRECT Reference designs/ app notes Technical training 9 · ProjeCt ANALog · mAr 08 http://www.microchip.com http://www.microchip.com/analog http://www.microchip.com/analog http://www.microchip.com/interface http://www.microchip.com/interface http://sample.microchip.com/Default.aspx?testCookies=true http://www.microchipdirect.com/catalogselection.aspx?returnURL=default.aspx http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1335&dDocName=en010405 http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1423

Table of Contents Feed for the Digital Edition of Project Analog - March 2008

Project Analog - March 2008 Contents Viewpoint About Project Analog Sponsor Wireless Communication Using the IrDA® Standard Protocol Wireless Design Choices Advanced Communication Solutions for Lighting Putting 10-GbE PHY Options Into Perspective Ease Into the Flexible CANbus Network Technology and Drivers for Mobile WiMAX Analog News—Analog News from Multiple Sources Enter to Win an iPhone Contact Project Analog Sponsor Treelink Microchip Advanced Parts Selector (MAPS)

Project Analog - March 2008

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