Low-Cost Transceiver Drives Wireless USB

Sept. 1, 2003
This low-cost system on a chip is the ideal medium-data-rate 2.4-GHz transceiver for low-cost wireless control and data applications, including computer mice, keyboards, and game controllers.

Wireless solutions must provide functionality at minimal cost. Sometimes, standards-based solutions, such as Bluetooth and Zigbee chip sets, offer excessive data-handling capability for certain applications, such as in remote-control devices. But the CYWUSB6934 WirelessUWB™ LS radio system on a chip (SoC) from Cypress Semiconductor Corp. (San Jose, CA) provides an ideal balance between data rate and price, offering data throughput to 62.5 kb/s at 2.4 GHz for a host of low-cost wireless Universal Serial Bus (USB) applications, including in wireless computer mice, keyboards, joysticks, and game controllers.

The CYWUSB6934 WirelessUWB™ LS radio SoC is an integrated circuit (IC) that incorporates dual direct-sequence-spread-spectrum (DSSS) baseband circuits, 2.4-GHz radio transmitter and receiver, Gaussian frequency-shift-keying (GFSK) modulator and demodulator, data serializer/deserializer (SERDES) circuitry, and an on-board frequency synthesizer (see figure). The chip features a fully synchronous SPI slave interface for connection to the central processing unit (CPU) of a target application.

The CYWUSB6934 can connect directly to a USB controller or any standard 8-b microcontroller with an SPI interface. The 2.4-GHz code-division-multiple-access (CDMA) radio transceiver IC employs a reconfigurable baseband section with three operating modes: series, dual-independent, and parallel modes.

The 2.4-GHz transceiver features transmit power of 0 dBm and receiver sensitivity of −90 dBm, which translates into a usable range of better than 10 m. The radio chip is also available as a transmit-only version as model CYWUSB6932. The devices are designed for power supplies of +2.7 to +3.6 VDC. Current consumption is typically 58 mA in receive mode and typically 62 mA in transmit mode; both devices have typical standby current of 1 µA, supporting long battery operating lifetimes.

Both ICs are supplied in 28-lead exposed-paddle SOIC housings, and will also be offered in a 56QFN, 8 × 8-mm package for space-constrained applications. A development kit (model CY3632 WirelessUSB LS), is also complete. P&A: $1.95 (transmit-only model CYWUSB6932), $2.20 (100,000 qty.), and $495.00 (development kit). Cypress Semiconductor Corp., 3901 North First St., San Jose, CA 95134; (408) 943-2600, FAX: (408) 943-6841, Internet: www.cypress.com.

About the Author

Jack Browne | Technical Contributor

Jack Browne, Technical Contributor, has worked in technical publishing for over 30 years. He managed the content and production of three technical journals while at the American Institute of Physics, including Medical Physics and the Journal of Vacuum Science & Technology. He has been a Publisher and Editor for Penton Media, started the firm’s Wireless Symposium & Exhibition trade show in 1993, and currently serves as Technical Contributor for that company's Microwaves & RF magazine. Browne, who holds a BS in Mathematics from City College of New York and BA degrees in English and Philosophy from Fordham University, is a member of the IEEE.

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