Telegesis ETRX3 ZigBee modules

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The Telegesis third-generation of advanced ZigBee modules is claimed to be the first module family on the market to feature the EM357 and EM351- the latest ARM Cortex M-3 SOCs from Ember.

The ETRX3 series modules have a footprint of 19 x 25 mm for both standard and PA/LNA versions, a 40% reduction in size compared to the ETRX2 module. They are available with either an onboard antenna or a Hirose U.FL connector to allow connection of external antennae.

A link budget of 105 dB on the standard ETRX3 module gives good performance and RF power can be boosted by use of the ETRX3-LR which adds an extra LNA+PA, boosting the link budget to 123 dB.

The ETRX3 series are low-power 2.4 GHz ZigBee modules integrating a 2.4 GHz, IEEE 802.15.4-compliant transceiver with up to 192 k of flash, 12 k of RAM and many advanced peripherals.

The EM357 and EM351 use an efficient architecture that exceeds the dynamic range requirements imposed by the IEEE 802.15.4-2003 standard by over 15 dB. The integrated receive channel filtering allows for robust co-existence with other communication standards in the 2.4 GHz spectrum, such as IEEE 802.11 and Bluetooth.

The ARM Cortex M3 microprocessor is optimised for high-performance, low power consumption and efficient memory utilisation, making it suitable for use in ZigBee applications.

The devices are designed to be easily integrated into designs without the need for RF or embedded expertise. Using the latest version of Embers Znet PRO meshing technology, the modules allow designers to add the latest meshing radio technology without complex software engineering.

Key features include: EM300 series ZigBee SOC featuring 32-bit ARM Cortex-M3 processor; estimated RX Sensitivity -99 dBm (-100 dBm Boost); estimated TX Power 3 dBm (5 dBm Boost); 128 µS wakeup; improved hardware MAC acceleration; JTAG interface for programming and debugging; chip Antenna and U.FL coaxial connector; FCC approved.