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MeshNetics ZigBit ZigBee解决方案

2007-08-25 嵌入式在线收藏 | 打印

MeshNetics公司的ZigBit是低功耗高灵敏度的2,4GHz 802.15.4 / ZigBee模块,它把主要的功能集成在不到1平方英吋的封装内.

      ZigBit是基于广受欢迎的ATmega 1281v MCU和最新的Atmel AT86RF230无线电收发器,提供特别优异的无线收发器性能,同时特别容易集成.ZigBit模块不需要昂贵和费时的RF开发,从而缩短了各种无线应用的面市时间. 802.15.4 / ZigBee嵌入软件保证了产品标准的无线连接的.本解决方案给出了ZigBit模式块的主要性能和方框图,应用电路图以及开发平台的主要性能.

       ZigBit is a low-power, high-sensitivity 802.15.4 / ZigBee module. ZigBit packs impressive functionality into less than a square inch of space. Based on a solid combination of the popular ATmega 1281v MCU and the latest Atmel AT86RF230 radio transceiver, the ZigBit offers superior radio performance with exceptional ease of integration. The ZigBit module eliminates the need for costly and time-consuming RF development, and shortens time to market for a wide range of wireless applications. 802.15.4/ZigBee embedded software ensures standards based wireless connectivity of your products.

       ZigBit; stands for ultra-compact, low-power, high-sensitivity 2.4GHz 802.15.4/ZigBee 2006 OEM modules from MeshNetics, based on the innovative Atmel’s mixed-signal hardware platform. They are designed for wireless sensing, control and data acquisition applications. The ZigBit modules eliminate the need for costly and timeconsuming RF development, and shorten time to market for a wide range of wireless applications.

       Two different versions of ZigBit modules are available: ZDM-A1281-B0 module with balanced RF port for applications where the benefits of PCB or external antenna can be utilized and ZDM-A1281-A2 module with chip antenna satisfying the needs of size sensitive applications.

       ZigBit features standards-based networking stack, based on IEEE802.15.4 PHY and MAC layers, and ZigBee NWK/APS/ZDO layers. It enables multipoint, multihop communications over an area of thousands of square meters at moderate data rates without expensive infrastructure support. The architecture of the Wireless Sensor Networks (WSN) allows for use of low powered devices. The applications include, but are not limited to:

       应用:

       Building automation & monitoring

        Lighting controls

       Wireless smoke and CO detectors

        Structural integrity monitoring

       HVAC monitoring & control

       Inventory management

        Environmental monitoring

       Security

       Water metering

        Industrial monitoring

       Machinery condition and performance monitoring

        Monitoring of plant system parameters such as temperature, pressure, flow, tank level, humidity,vibration, etc.

        Automated meter reading (AMR)

       主要特性:

       Ultra compact size (24 x 13.5 mm for ZDM-A1281-A2 module and 18,8 x 13.5 mm forZDM-A1281-B0 module)

       Innovative (patent-pending) balanced chip antenna design with antenna gain of approximately 0 dBi (for ZDM-A1281-A2 version)

       High RX sensitivity (-101 dBm)

       Outperforming link budget (104 dB)

        Up to 3 dBm output power

       Very low power consumption (<6 μA in deep sleep mode)

       Ample memory resources (128 kBytes of flash memory, 8 kBytes RAM, 4 kBytes EEPROM)

      Wide range of interfaces (both analog and digital):

        10 spare GPIO, 2 spare IRQ lines

         4 ADC lines

         UART with CTS/RTS control

          I2C, USART/SPI

          Up to 30 lines can be configured as GPIO

         Capability to write own MAC address into the EEPROM

         Optional antenna reference designs

          IEEE 802.15.4 compliant

           2.4 GHz ISM band

          eZeeNet embedded software, including UART bootloader and AT command set
优势:

          Less physical space constraints

          Best-in-class RF link range

           Longer battery life

          Easy prototyping with 2-layer PCB

           More memory for user software application

           Mesh networking capability

           Easy-to-use low cost Evaluation Kit

           Single source of support for HW and SW

          Worldwide license-free operation

        ZigBit is a low-power, high-sensitivity IEEE802.15.4/ ZigBee-2006 compliant OEM module. This multifunctional device occupies less than a square inch of space, which is comparable to a typical size of a single chip. Based on a solid combination of Atmel’s latest AVR Z-Link hardware platform [1], the ZigBit offers superior radio performance with exceptional ease of integration.

       ZigBit modules comply with the FCC (Part 15), IC and ETSI (CE) rules applicable to the devices radiating in uncontrolled environment. For details, see section Agency Certifications below.

       ZigBit fully satisfies the requirements of the “Directive 2002/95/EC of the European Parliament and the Council of 27January 2003 on the restriction of the use of certain hazardous substances in electrical and electronic equipment” (RoHS). MeshNetics provides fully compliant product in all regions where the directive is enforced July 1, 2006.

       The ZigBit contains Atmel’s ATmega1281V Microcontroller [1] and AT86RF230 RF Transceiver [2].

       The module features 128kb flash memory and 8 kb RAM. The ZigBit already contains a complete RF/MCU-related design with all the necessary passive components included. The module can be easily mounted on a simple 2-layer PCB. Compared to a single-chip, a module-based solution offers considerable savings in development time & NRE cost per unit during the design &   prototyping phase.

       Innovative (patent-pending) chip antenna design in ZDMA1281-A2 module eliminates the balun and achieves good performance over ZigBee frequency band.

       MeshNetics provides tools for building ready-to-use applications around the ZigBit module. The Evaluation Kit and the Development Kit help prototyping and testing an 802.15.4 or ZigBee networking solution. It includes the sensor boards with multiple interfaces, an out-of-theboxdata acquisition software suite, as well as accessories and documentation. The sample sensor data acquisition application allows network monitoring and data collection, all visualized via graphic interface.

       The ZigBit modules come bundled with the eZeeNet networking firmware. The eZeeNet enables the modulebased OEM products to form self-healing, self-organizing mesh networks. The eZeeNet stack conforms to IEEE802.15.4/ ZigBee specifications [3], [4], [5]. Depending on your design requirements, you can use the ZigBit to operate a sensor node, where it would function as a single MCU. Or you can pair it to a host processor, where the module would serve essentially as a modem.

       In the former case, a user application should be bundled with the eZeeNet software. The eZeeNet’s programming interface gives users flexibility to manage network and minimize power consumption.

      模块ZDM-A1281-B0方框图:

模块ZDM-A1281-A2方框图.

eZeeNet™方框图:

下图为典型的应用电路图:

      MeshBean 开发平台(带传感器):

      ZigBit 评估板包括:

      3 x MeshBean evaluation sensor boards with battery holders

      3 x ZigBit OEM modules mounted on MeshBean boards

      3 x AC power adaptors with cords

      3 x USB cables

      2 x serial cables

      1 x software & documentation CD

      The MeshBean evaluation boards with sensors making part of the ZEK hardware set serve for the evaluation of the ZigBit module’s performance. The ZigBit module with the embedded eZeeNet software enables the board’s wireless connectivity and makes it function as a node in the ZigBee network. The board can be configured to operate as a network coordinator or a router either by DIP-switch settings or via AT-commands.

      下图为MeshBean 评估传感器板外形图: