CHAPTER 1 ： Hello ZigBee

報告日期： 11 月 3 日報告學生：呂冠達指導教授：吳坤熹 教授

Outline

• Introduction

• 1.1 What’s a ZigBee?

• 1.2 The ZigBee Alliance

• ZigBee aims for low data rates and a tiny stack that fits on 8-bit microcontrollers.

• ZigBee looks to control a light or send temperature data to thermostat( 恆溫器 ).

• ZigBee is designed to run for years, and the products can typically provide decade or more of use.

• “Wireless Control That Simply Works”

Why ZigBee is ideally suited on the wireless control market?

Highly reliableCost-effectiveAble to achieve very low powerHighly secureAn open global standard

1.1 What’s a ZigBee?

• BluetoothTM

is great at point-to-point. ZigBee is great at wireless control in multi-hop mesh network.

1.1.1 ZigBee Is Highly ReliableZigBee achieves high reliability in a number of ways: IEEE 802.15.4 with O-QPSK(Offset-Quadrature Phase-

Shift Keying; 偏移四相相移鍵控 ) and DSSS(Direct Sequence Spread Spectrum; 直接序列展頻 )

CSMA-CA(Carrier Sense Multiple Access Collision Avoidance; 載波偵測多重存取 / 避免碰撞 )

16-bit CRCs(Cyclic Redundancy Check; 循環冗餘檢查 )

Acknowledgments at each routeMesh networking to find reliable routeEnd-to-end acknowledgments to verify data made it to

the destination

1.1.2 ZigBee Is Cost-Effective

Multiple silicon( 矽 ) and stack vendors, ZigBee modules and many available resources all contribute to low development costs for ZigBee devices.

1.1.3 ZigBee Is Low-Power

• The real secret to low power consumption in ZigBee, in addition to radios and microcontrollers that can sleep, is low duty cycle.

1.1.4 ZigBee Is Highly Secure

ZigBee uses AES(Advanced Encryption Standard) 128-bit for encryption and authentication. Why?

It’s an internationally recognized and trusted standard.

It’s free of patent infringements.It’s implementable on 8-bit processor.

1.1.5 ZigBee Is an Open Global Standard

• Multiple vendors offer ZigBee stacks, silicon and application solutions.

1.1.6 ZigBee Is Low Data Rate

• In order to achieve low cost and low power, and considering the application space and markets ZigBee is aiming for.

• ZigBee throughput is typically 25 kilobits per second.

1.2 The ZigBee Alliance

• http://www.zigbee.org

• The ZigBee Alliance is also the gatekeeper who enforces compliance and compatibility.

• ZigBee Alliance membership is required in order to ship ZigBee technology in products.

The End!!!