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RF/Microwave??

Freescale aims radio chips at 2.45GHz band

Posted: 16 Jul 2004 ?? ?Print Version ?Bookmark and Share

Keywords:zigbee? radio? wireless network? home? mcu?

Freescale Semiconductor Inc. announces two low-power, 2.45GHz integrated radios--one for proprietary applications, the other with a full Zigbee protocol and network stack, IEEE 802.15.4 compliance and support for star and mesh topologies. Both target home automation, industrial control and wireless sensor networks and can be paired with MCUs ranging from 8bits to 32bits.

The standalone MC13191 supports point-to-point and star topologies, said Matt Maupin, product marketing manager at Freescale's wireless division. It targets designs where non-standard software and other features can be added to improve security.

For full-blown Zigbee applications, the MC13192 transceiver contains an IEEE 802.15.4 physical layer and supports star and mesh networking. The Zigbee stack, including media access control, network and application, is designed to be implemented on an accompanying MCU.

While the IEEE 802.15.4 standard encompasses bands used in the Americas (915MHz) and Europe (868MHz), Maupin said that Freescale's designs are solely for 2.45GHz operation to support a larger, global market. Both radios comprise a complete modem with an over-the-air rate of 250Kbps using orthogonal QPSK modulation and DSSS coding. Communication with the MCU is via a four-wire serial peripheral interface.

Power output is zero to 3.6dBm, and the practical line-of-sight range is 10m to 30m. The radios pull 1?A in "off" and 40?A in "doze" mode. Receive sensitivity is -91dBm for the MC13191 and -92dBm for the MC13192. Both are fabbed in 0.18?m RF CMOS and come in 32-pin QFN packages.

The chips are available now. In quantities of 10,000, the MC13191 is priced at $2.28 each and the MC13192 at $2.70. A development kit that packs all the network protocol stacks needed for a full Zigbee design sells for $199.

- Patrick Mannion

EE Times





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