Application Notes - Cypress.com

AN72428 - Schematic Review Checklist for WirelessUSB™ NL

Thu, 07 Feb 2013 20:55:15 -0600

Introduction

WirelessUSB NL enables a Gaussian frequency-shift keying (GFSK) radio by using a differentiated single-mixer, closed-loop modulation design that optimizes power efficiency and interference immunity. Closed-loop modulation effectively eliminates the problem of frequency drift, which enables WirelessUSB NL to transmit up to 255-byte payloads without repeatedly having to pay power penalties for relocking the phase-locked loop (PLL) as in open-loop designs.

AN79455 - Getting Started with WirelessUSB™-LP Radio and enCoRe™ V LV

Fri, 04 Jan 2013 01:48:04 -0600

It explains how to use PSoC® Designer™ 5.2 software to configure the ADC, LCD, and SPI User Modules with an enCoRe V LV device. Attached code examples demonstrate how to use the WirelessUSB LP Radio driver APIs and PSoC library APIs for a wireless data exchange application.

Introduction

In this application note, we use a CY3660 Development Kit (DVK) to demonstrate wireless data exchange between two enCoRe™ V LV devices each using the WirelessUSB™-LP Radio. The CY3660 DVK includes two enCoRe V LV development boards, each with a WirelessUSB-LP radio. With the PSoC® Designer™ projects attached to this application, we configure one board for data transmission and the second board for data reception.

AN83281 - Developing RF-Based Remote Control Using WirelessUSB™-NL

Wed, 02 Jan 2013 01:07:33 -0600

The resulting application overcomes the major shortcomings of IR-based remote control. Included in the application note are descriptions of the system architecture and associated functional modules and PSoC projects.

Introduction

This application note focuses on an RF-based remote control device operating over the 2.4-GHz ISM (industrial, scientific, and medical) band. Because it uses Cypress’s proprietary WirelessUSB-NL radio, the device overcomes the following shortcomings of IR-based remote control:

line-of-sight pointing
limited operating angles
short transmission range
reflection problems
high current consumption

AN6066 - Wireless Binding Methodologies

Thu, 16 Aug 2012 05:37:56 -0600

Introduction

Robust wireless systems require a well thought out method of establishing a connection between different elements in the system. This method is called "binding", its purpose is to enable communication and prohibit unwanted connection with devices outside the intended system.

AN48399 - WirelessUSB™ LP/LPstar Transceiver PCB Layout Guidelines

Mon, 23 Jul 2012 05:02:07 -0600

AN48399 provides guidelines for PCB layout design and manufacture of the WirelessUSB™ LP/LPstar transceiver chip. These recommendations help in saving time and money in the development of an integrated wireless solution, by avoiding costly layout changes late in the design cycle. There is also an increased robustness through reduction in power supply noise, receiver sensitivity degradation, crystal pulling, and antenna detuning.

AN48610 - Design and Layout Guidelines for Matching Network and Antenna for WirelessUSB™ LP Family

Mon, 23 Jul 2012 05:00:04 -0600

This application note describes the matching network and antenna design recommended for the 2.4-GHz WirelessUSB LP/LPstar radio. A properly designed PCB facilitates the evaluation, characterization, and production test correlation of the WirelessUSB LP/LPstar radio system on-chip solution. These suggestions are tested and proven by Cypress to ensure optimal radio performance when combining RF analog circuitry with other low frequency analog and digital board components. This application note provides design details for the matching network, impedance measurements, and layout suggestions. The antenna design and layout suggestions and the RF performance results are also discussed.

WirelessUSB LP RDK Japanese Radio Law Testing and Verification - AN17581

Mon, 23 Jul 2012 04:57:58 -0600

This application note discusses the necessary information for you to use a WirelessUSB(TM) LP radio in a product intended for the Japanese market. WirelessUSB based systems require a certification to market the product to make certain that it meets international regulations and national laws. This application note serves as a reference point in selecting WirelessUSB LP Radio for your application needs. The use of a Cypress radio chip and its suitability for Japanese product development is demonstrated by providing the compliance data on a reference development kit.

AN64285 - WirelessUSB(TM) NL Low Power Radio Recommended Usage and PCB Layout

Mon, 23 Jul 2012 04:48:13 -0600

Wireless products are now found in abundance, all around us today, and their usage continues to rapidly expand. This application note introduces the Cypress CYRF8935 device and a sample PCB design. The appendix section guides you on antenna selection process.

AN15482 - Using Capture Timers in enCoRe™ II and enCoRe II LV Devices

Mon, 23 Jul 2012 04:44:52 -0600

This application note describes the features and architecture of the enCoRe™ II capture timer module and explains its use. Assembly language and C language code examples are also provided as PSoC Designer™ projects with this application note.

AN5033 - WirelessUSB™ Dual Antenna Design Layout Guidelines

Mon, 23 Jul 2012 04:36:53 -0600

This application note describes the guidelines for the antenna design and in particular, addresses the design of an integrated printed trace wiggle antenna implementation on a reference printed circuit board. The development of small integrated antenna facilitates the application of the Cypress WirelessUSB(TM) chip as an integrated wireless communication solution. WirelessUSB is the code name for a technology specification (Cypress Semiconductor's proprietary) for small form factor, low cost, short range radio links between mobile, desktop PCs, and other portable devices. The antenna is an integral part of any wireless communication system. It is the interface between a radio module and atmosphere.

WirelessUSB(TM) 2-Way HID Systems - AN4003

Mon, 23 Jul 2012 04:32:25 -0600

The WirelessUSB™ 2-Way Human Interface Device (HID) protocol is designed for reliable 2-Way communication between a wireless bridge and target HID applications in 1:1 (one HID and one bridge) and 2:1 (two HIDs and one bridge) systems. The WirelessUSB 2-Way HID protocol allows HID applications to establish a connection to the bridge and receive ACK, NAK and DATA packets from the bridge.

AN15257 - Guidelines for Evaluating System Performance of Cypress WirelessUSB™ RF Products

Mon, 23 Jul 2012 04:28:59 -0600

When product designers use reference designs as a basis for their own projects, they typically modify or enhance the original designs. Unfortunately, these modifications can cause a considerable decline in performance. This application note describes parameters that can affect WirelessUSB system performance. It also explains how to evaluate these parameters within your own wireless product design.

AN43353 - Using enCoRe™ V 16-Bit Timer Modules as PWMs

Thu, 16 Feb 2012 02:58:33 -0600

Introduction

The Cypress enCoRe V device is a full-speed USB peripheral controller with configurable resources. To help you design easily, the enCoRe V development tool kit provides predefined readymade firmware code called user modules (UM). These user modules help configure the available resources to function as required.

AN2373 - Ranking Original Pseudo-Noise Codes in a DSSS System

Tue, 06 Sep 2011 02:50:07 -0600

If a WirelessUSB(TM) or any direct-sequence spread spectrum (DSSS) system is to be used with unique pseudonoise (PN) codes, an assessment should be done of the code's auto-correlation properties. Being able to assess the quality of a given PN code relative to another is important in choosing a code appropriate for an application. An algorithm was developed to rank PN codes by assigning a score based on the length of the groups of overlapping sections of the code. The algorithm is too inefficient to use to find the optimal PN codes. However, optimal PN codes are not necessary, but good PN codes are. Range testing results prove the ranked PN codes out performed each other by the average number of retries needed for successful communication. Therefore, the ranking of the codes should suffice in order to determine that any PN codes chosen are acceptable for use. The codes provided by Cypress were determined not to be the optimal found by the algorithm. This is because the criteria that the algorithm assesses do not nclude cross correlation properties. This rationale postulates that the list provided by Cypress is a good starting point to generate original PN codes, if needed.

AN4004 - Interference Mitigation Challenges and Solutions in the 2.4 to 2.5 GHz ISM Band

Wed, 29 Jun 2011 08:59:32 -0600

As more products use 2.4 GHz ISM band of the radio spectrum, designers have to deal with increased interference signals from other sources. Regulations governing unlicensed parts of the spectrum state devices experience interference. This application note examines the various interference management techniques provided by the 2.4 GHz wireless systems and describes how to create frequency stability in a 2.4 GHz design using low cost tools.

Calculating Battery Life in WirelessUSB™ Systems - AN4002

Thu, 10 Mar 2011 18:20:43 -0600

This application note provides guidelines for calculating expected battery life in 2-way WirelessUSB products for engineers who are familiar with these basic power management concepts. Three common WirelessUSB applications are then examined in depth by analyzing three case study examples.