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CYWUSB6935: WirelessUSB  LR 2.4-GHz DSSS Radio SoC <ul><li>Source: Cypress Semiconductor </li></ul>
Introduction <ul><li>Purpose </li></ul><ul><ul><li>This   training   module   introduces   the   WirelessUSB   technology ...
WirelessUSB Market Positioning Proprietary 27MHz/900MHz ZigBee networking  solution for home/industrial automation Simple ...
Wireless Technology Segmentation
WirelessUSB vs. 27MHz <ul><li>WirelessUSB is a higher quality solution </li></ul><ul><ul><li>10M range for home and confer...
WirelessUSB vs. Bluetooth <ul><li>Bluetooth   is   a   poor   solution   for   HID </li></ul><ul><ul><li>Bluetooth   desig...
Features of CYWUSB6935 <ul><li>2.4-GHz radio transceiver. </li></ul><ul><li>Operates in the unlicensed Industrial, Scienti...
Applications <ul><li>Building/Home Automation </li></ul><ul><ul><li>Climate Control </li></ul></ul><ul><ul><li>Lighting Co...
Functional Description of CYWUSB6935 The CYWUSB6935 transceiver is a single-chip 2.4-GHz Direct Sequence Spread Spectrum (...
Block Diagram Parameters <ul><li>GFSK Modem: </li></ul><ul><ul><li>The transmitter uses a DSP-based vector modulator to co...
Block Diagram Parameters <ul><li>Serializer/Deserializer (SERDES): </li></ul><ul><ul><li>The SERDES provides byte-level fr...
DSSS and PN Code <ul><li>DSSS = Direct Sequence Spread Spectrum </li></ul><ul><ul><li>DSSS generates a bit pattern for eac...
<ul><li>For illustration purposes, a 10-bit PN Code is used in the example diagram </li></ul><ul><li>WirelessUSB uses 32 o...
1 Bit Transmission using a 64 bit PN Code
RSSI <ul><li>RSSI = Receive Signal Strength Indicator </li></ul><ul><ul><li>Determine the connection quality </li></ul></u...
Avoiding Interference 2400 2404 2408 2412 2420 2424 2428 2416 Close range Wi-Fi signal may interfere with your 2.4GHz devi...
Application Examples CYWUSB6935 Battery Powered Device
MCU   Interface Sequence Diagrams
Application: WirelessUSB LR Alarm System WirelessUSB LR Alarm System
Additional Resource <ul><li>For ordering the CYWUSB6935, please click the part list or </li></ul><ul><li>Call our sales ho...
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CYWUSB6935: WirelessUSB LR 2.4-GHz DSSS Radio SoC

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Introduction of the WirelessUSB technology and CYWUSB693 WirelessUSB transceiver

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CYWUSB6935: WirelessUSB LR 2.4-GHz DSSS Radio SoC

  1. 1. CYWUSB6935: WirelessUSB LR 2.4-GHz DSSS Radio SoC <ul><li>Source: Cypress Semiconductor </li></ul>
  2. 2. Introduction <ul><li>Purpose </li></ul><ul><ul><li>This training module introduces the WirelessUSB technology and CYWUSB693 WirelessUSB transceiver. </li></ul></ul><ul><li>Outline </li></ul><ul><ul><li>Introduction of the WirelessUSB technology </li></ul></ul><ul><ul><li>Difference between WirelessUSB and different Techniques. </li></ul></ul><ul><ul><li>Features of CYWUSB6935 device. </li></ul></ul><ul><ul><li>Functional block diagram and functional overview </li></ul></ul><ul><ul><li>Application Example. </li></ul></ul><ul><li>Content </li></ul><ul><ul><li>20 pages </li></ul></ul>
  3. 3. WirelessUSB Market Positioning Proprietary 27MHz/900MHz ZigBee networking solution for home/industrial automation Simple Point-to-Point wireless solution BT Short-range networking solution Long-range networking solution 802.11 Cost / Complexity Strategy:make WirelessUSB the defacto standard for multi-point to point wireless Networking Wire Replacement UWB Short-range, high-speed networking solution RFID Tags WirelessUSB TM Simple Multipoint-to-Point solution Active/Passive Tags for inventory tracking
  4. 4. Wireless Technology Segmentation
  5. 5. WirelessUSB vs. 27MHz <ul><li>WirelessUSB is a higher quality solution </li></ul><ul><ul><li>10M range for home and conference room use </li></ul></ul><ul><ul><li>Virtually unlimited co-location for office and classroom use </li></ul></ul><ul><ul><li>Bi-Directional for better security and robustness </li></ul></ul><ul><ul><li>Bandwidth for many devices (KBM, Remote, Joystick etc.) </li></ul></ul><ul><li>WirelessUSB has Comparable Cost </li></ul><ul><ul><li>WirelessUSB is on a silicon cost reduction path </li></ul></ul><ul><ul><li>Integration of MCU+radio in development </li></ul></ul><ul><li>2.4GHz is bigger than 27MHz </li></ul><ul><ul><li>Real and perceived advantage (e.g. cordless telephones) </li></ul></ul>WirelessUSB is designed to replace 27MHz systems
  6. 6. WirelessUSB vs. Bluetooth <ul><li>Bluetooth is a poor solution for HID </li></ul><ul><ul><li>Bluetooth designed for cell-phone usage model </li></ul></ul><ul><ul><ul><li>Assumes frequent recharging, roaming, ad-hoc networking </li></ul></ul></ul><ul><ul><ul><li>Results in poor battery life or forces rechargeable solutions </li></ul></ul></ul><ul><ul><li>Complex installation results in high support cost </li></ul></ul><ul><ul><li>Use of BT network (printing, syncing) reduces KBM performance </li></ul></ul><ul><li>WirelessUSB costs less and performs better </li></ul><ul><ul><li>All the benefits of 2.4GHz approaching 27MHz prices </li></ul></ul><ul><ul><li>Installation is plug and play </li></ul></ul><ul><ul><li>No confusing driver support and interoperability issues </li></ul></ul><ul><li>Bluetooth has issues with interference and co-location </li></ul><ul><ul><li>BT 1.2 helps interference, but makes co-location worse </li></ul></ul><ul><li>Bluetooth not well suited for remote control devices </li></ul>
  7. 7. Features of CYWUSB6935 <ul><li>2.4-GHz radio transceiver. </li></ul><ul><li>Operates in the unlicensed Industrial, Scientific, and Medical (ISM) band (2.4 GHz–2.483 GHz). </li></ul><ul><li>– 95-dBm receive sensitivity. </li></ul><ul><li>Up to 0dBm output power. </li></ul><ul><li>Range of up to 50 meters or more. </li></ul><ul><li>Data throughput of up to 62.5 Kbits/sec. </li></ul><ul><li>Highly integrated low cost, minimal number of external components required. </li></ul><ul><li>Dual DSSS reconfigurable baseband correlators. </li></ul><ul><li>SPI microcontroller interface (up to 2-MHz data rate). </li></ul><ul><li>13-MHz input clock operation. </li></ul><ul><li>Low standby current < 1 μA. </li></ul><ul><li>Integrated 30-bit Manufacturing ID. </li></ul><ul><li>Operating voltage from 2.7V to 3.6V. </li></ul>
  8. 8. Applications <ul><li>Building/Home Automation </li></ul><ul><ul><li>Climate Control </li></ul></ul><ul><ul><li>Lighting Control </li></ul></ul><ul><ul><li>Smart Appliances </li></ul></ul><ul><ul><li>On-Site Paging Systems </li></ul></ul><ul><ul><li>Alarm and Security </li></ul></ul><ul><li>Industrial Control </li></ul><ul><ul><li>Inventory Management </li></ul></ul><ul><ul><li>Factory Automation </li></ul></ul><ul><ul><li>Data Acquisition </li></ul></ul><ul><li>Automatic Meter Reading (AMR) </li></ul><ul><li>Transportation </li></ul><ul><ul><li>Diagnostics </li></ul></ul><ul><ul><li>Remote Keyless Entry </li></ul></ul><ul><li>Consumer / PC </li></ul><ul><ul><li>Locator Alarms </li></ul></ul><ul><ul><li>Presenter Tools </li></ul></ul><ul><ul><li>Remote Controls </li></ul></ul><ul><ul><li>Toys </li></ul></ul>
  9. 9. Functional Description of CYWUSB6935 The CYWUSB6935 transceiver is a single-chip 2.4-GHz Direct Sequence Spread Spectrum (DSSS) Gaussian Frequency Shift Keying (GFSK) baseband modem radio that connects directly to a microcontroller via a simple serial peripheral interface.
  10. 10. Block Diagram Parameters <ul><li>GFSK Modem: </li></ul><ul><ul><li>The transmitter uses a DSP-based vector modulator to convert the 1-MHz chips to an accurate GFSK carrier. </li></ul></ul><ul><ul><li>The receiver uses a fully integrated Frequency Modulator (FM) detector with automatic data slicer to demodulate the GFSK Signal. </li></ul></ul><ul><li>Dual DSSS Baseband: </li></ul><ul><ul><li>Data is converted to DSSS chips by a digital spreader. </li></ul></ul><ul><ul><li>De-spreading is performed by an oversampled correlator. </li></ul></ul><ul><ul><li>The DSSS baseband cancels spurious noise and assembles properly correlated data bytes. </li></ul></ul><ul><ul><li>The DSSS baseband has three operating modes: 64-chips/bit Single Channel, 32-chips/bit Single Channel, and 32-chips/bit Single Channel Dual Data Rate. </li></ul></ul>
  11. 11. Block Diagram Parameters <ul><li>Serializer/Deserializer (SERDES): </li></ul><ul><ul><li>The SERDES provides byte-level framing of transmit and receive data. </li></ul></ul><ul><ul><li>Bytes for transmission are loaded into the SERDES and receive bytes are read from the SERDES via the SPI interface. </li></ul></ul><ul><ul><li>The SERDES provides double buffering of transmit and receive data. </li></ul></ul><ul><li>Application Interfaces: </li></ul><ul><ul><li>CYWUSB6935 has a fully synchronous SPI slave interface for connectivity to the application MCU. </li></ul></ul><ul><ul><ul><li>Configuration and byte-oriented data transfer can be performed over this interface. </li></ul></ul></ul><ul><ul><ul><li>An interrupt is provided to trigger real time events. </li></ul></ul></ul><ul><ul><li>An optional SERDES Bypass mode (DIO) is provided for applications that require a synchronous serial bit-oriented data path. </li></ul></ul>
  12. 12. DSSS and PN Code <ul><li>DSSS = Direct Sequence Spread Spectrum </li></ul><ul><ul><li>DSSS generates a bit pattern for each data bit to be transmitted </li></ul></ul><ul><ul><li>WirelessUSB uses a 32 or 64-chip “pattern” also known as PN Code </li></ul></ul><ul><li>PN Code = Pseudo Noise Code </li></ul><ul><ul><li>A very distinct 32 or 64-chip binary signal </li></ul></ul><ul><ul><li>For every data bit to be transmitted, a 32 or 64-chip PN Code is produced </li></ul></ul>
  13. 13. <ul><li>For illustration purposes, a 10-bit PN Code is used in the example diagram </li></ul><ul><li>WirelessUSB uses 32 or 64-bit PN Codes </li></ul><ul><li>The PN Code is transmitted at a much higher frequency than the data bit; therefore, it appears as random noise </li></ul>PN Code
  14. 14. 1 Bit Transmission using a 64 bit PN Code
  15. 15. RSSI <ul><li>RSSI = Receive Signal Strength Indicator </li></ul><ul><ul><li>Determine the connection quality </li></ul></ul><ul><ul><li>Determine the value of the noise floor </li></ul></ul><ul><ul><li>Check for a quiet channel before transmitting. </li></ul></ul><ul><ul><li>A 5-bit field of the read-only REG_RSSI Register inside the radio indicates the strength of the received signal </li></ul></ul><ul><ul><li>The higher values indicating stronger received signals </li></ul></ul><ul><ul><li>If the RSSI value is too high, interference is the most likely cause, so the WUSB system tries to find a quieter channel to operate in </li></ul></ul><ul><ul><li>In a WirelessUSB system, only the “Dongle” monitors RSSI </li></ul></ul>
  16. 16. Avoiding Interference 2400 2404 2408 2412 2420 2424 2428 2416 Close range Wi-Fi signal may interfere with your 2.4GHz device Interference detected due to increased error rates Free channel found Frequency (MHz) The key to avoiding interference is detecting it Receive Signal Strength Indicator High signal strength ( RSSI ) detected here, so search continues
  17. 17. Application Examples CYWUSB6935 Battery Powered Device
  18. 18. MCU Interface Sequence Diagrams
  19. 19. Application: WirelessUSB LR Alarm System WirelessUSB LR Alarm System
  20. 20. Additional Resource <ul><li>For ordering the CYWUSB6935, please click the part list or </li></ul><ul><li>Call our sales hotline </li></ul><ul><li>For additional inquires contact our technical service hotline </li></ul><ul><li>For more product information go to </li></ul><ul><li>http://www.cypress.com/products/?gid=14&fid=65&rpn=CYWUSB6935 </li></ul>Newark Farnell

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