ZigBee ETRX2-PA Module Guide - Features, Specs, Interface & Apps
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An Overview on ZigBee ETRX2PA wireless mesh networking interface
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ZigBee ETRX2-PA Module Guide - Features, Specs, Interface & Apps
- 12. TX Power Characteristics and Performance The diagrams above shows the typical output power and module current in dependency on module supply voltage and EM250 power setting in NORMAL MODE.
Editor's Notes
- This is a training module on the Telegesis ETRX2-PA ZigBee Mesh Networking Module
- Welcome to this training module on ZigBee ETRX2PA wireless mesh networking interface. This module will provide information on the ZigBee radio specification, hardware and firmware interface and applications that fit this module.
- There are a multitude of standards that address mid to high data rates for voice, PC LANs, video, etc. However, sensors and control devices don’t need high bandwidth but they do need low latency and very low energy consumption for long battery lives and for large device arrays. ZigBee is poised to become the global control/sensor network standard. It has been designed to provide low power consumption, simply implemented, high density of nodes per network, reliable data transfer, and appropriate levels of security. Several topologies are supported by ZigBee, including star and mesh. Star topology is most useful when several end devices are located close together so that they can communicate with a single router node. Telegesis ZigBee module uses mesh networking to allow for redundancy in node links, so that if one node goes down, devices can find an alternative path to communicate with one another.
- The Telegesis ETRX2-PA module has been designed to be integrated into any device without the need for RF experience and expertise. The form factor of the ETRX2-PA is identical to the ETRX2, so either module can be used depending on the range requirements of the particular application. Utilizing the EmberZNet meshing and self-healing stack, the ETRX2-PA enables you to add powerful wireless networking capability to your products and quickly bring them to market. With single ended RF output, the module is available with integrated antenna or 50Ω U.FL coaxial connector or 50Ω pad terminal on the bottom of the module. The configurable functionality often allows the ETRX2-PA wireless meshing module to be used without an additional host microcontroller.
- The Telegesis ETRX2-PA module is a power amplified 2.4GHz ISM band transceiver based on the Ember EM250 single chip ZigBee/IEEE802.15.4 solution. It consumes typically 17dBm (50mW) output power with High sensitivity of up to -97dBm @ at 1% packet error rate and hardware acceleration for IEEE 802.15.4 compliant transmissions. The data transfer rate is compliant with IEEE 802.15.4 specification at 250Kbps.
- The ZigBee module can be used into almost every area of communication like Home-Building Automation, wireless sensor network, PC peripherals, Metering application, wireless alarm, and security systems.
- The main building blocks of the ETRX2-PA are the single chip EM250 from Ember, a 24MHz reference crystal and RF front-end circuitry optimized for best RF performance. The ETRX2-PA module allows extended range of operation by means of an integrated high efficiency power amplifier inserted in the Tx path. With single ended RF output, the module is available with integrated antenna or 50Ω U.FL coaxial connector or 50Ω pad terminal on the bottom of the module. A low loss LTCC band-pass filter for the 2.4GHz ISM band is added to both the Tx and Rx path to attain immunity against interferers.
- EM250 contains an internal LDO regulator, the module can be supplied with an additional integrated onboard LDO regulator or DC/DC converter. Some applications could benefit from this additional regulator in instances where: Further extension of the input voltage range is required; extended battery life is obtained by replacing the regulator within the EM250 with a special ultra-low quiescent current regulator. Two different types of regulators are available, a linear (LDO) type or a high efficiency switched buck regulator. A second option which is available is an on board 32.768kHz crystal reference. This option can be provided for applications which require a high precision reference clock.
- The ETRX2 module has up to four analogue inputs. Readings with reference to the internal 1.2V reference voltage can be made locally as well as over the air. Pins I/O11-0 are bi-directional I/O ports which can be controlled locally as well as remotely by accessing local as well as remote S-registers. The functionality of the I/Os can be controlled using three single 16-bit registers representing the data direction. The AT style command interpreter can be accessed via the TXD and RXD pins. The ETRX2-PA can buffer up to 128 bytes of incoming data in a software FIFO buffer and uses XON/XOFF or hardware flow control. Up to 4 I/Os can trigger user definable actions. User configurable edges can cause interrupts if this function is enabled in the S-Registers. Pulling the reset pin low will cause the module to restart. I/O3 can alternatively act as a special function pin which can generate output waveforms up to 12MHz or act as a PWM.
- The modules has been pre-loaded with a standalone boot loader which supports over-the-air boot loading as well as serial boot loading of new firmware. In order to enter the standalone boot loader using a hardware trigger pull A/D2 (GPIO5) to ground and power-cycle the module. The ETRX2 firmware uses the meshing and self healing EmberZNet PRO stack to overcome many of the limitations of the tree network topology of the ZigBee® 2006 stack. Te meshing stack implements routers/coordinators as well as end devices. When the module acts as a router, it is typically a mains powered device whilst a sleepy end device can be battery powered. The module is also able to act as a PAN coordinator through external host control. The Telegesis firmware also allows low-level access to physical parameters such as channel and power level.
- Using the default firmware the ETRX2-PA is controlled using a simple AT-style command interface and (mostly) non-volatile S-Registers. The AT command dictionary document will introduce full list of all the available AT commands – the link shown. If you need to find out which firmware resides on your module simply type “ ATI ” followed by a carriage return and you will be prompted with the module’s manufacturing information. The firmware is able to be upgraded either via a serial link or over the air. At power-up the last configuration is loaded from non volatile S-Registers, which can eliminate the need for an additional host controller
- The diagrams above shows the typical output power and module current is dependent on module supply voltage and EM250 power setting in NORMAL MODE. The power setting is the setting of the EM250’s output power (before amplification). This setting is used by all firmware running on the ETRX2-PA.
- Thank you for taking the time to view this presentation on ETRX2-PA. If you would like to learn more or go on to purchase some of these devices, you may either click on the part list link, or simple call our sales hotline. For more technical information you may either visit the Telegesis site http://www.telegesis.com/product_range_overview/etrx-2_pa.htm or if you would prefer to speak to someone live, please call our hotline number, or even use our ‘live chat’ online facility.