Introduction
The FT 3120 and FT 3150 Free Topology Smart Transceivers integrate a Neuron 3120 or Neuron 3150 network processor core, respectively, with a free topology twisted pair transceiver to create a low cost, smart transceiver on a chip. Combined with Echelon's high performance FT-.x1 or FT--X2 Communication Transformer, the FT 3120 and FT 3150 smart transceivers set new benchmarks for performance, robustness, and low cost. Ideal for use in LonWorks devices destined for building, industrial, transportation, home, and utility automation applications, the FT 3120 and FT 3150 Free Topology Smart Transceivers can be used in both new product designs and as a means of cost reducing existing nodes.
The integral transceiver is fully compatible with the TP/FT-10 channel and can communicate with devices using Echelon's FTT-10A Free Topology Transceiver, and, when used with suitable DC isolation capacitors, the LPT-11 Link Power Transceiver. The free topology transceiver supports polarity insensitive cabling using a star, bus, daisy-chain, loop, or combination topology — freeing the installer from the need to adhere to a strict set of wiring rules. Free topology wiring reduces the time and expense of node installation by allowing the wiring to be installed in the most expeditious and cost-effective manner. It also simplifies network expansion by eliminating restrictions on wire routing, splicing, and node placement.
The FT 3120 Free Topology Smart Transceiver is a complete system-on-a-chip that is targeted at cost-sensitive and small form factor designs with a need for up to 4Kbytes of application code. The Neuron 3120 core operates at up to 40MHz, and includes 4Kbytes of EEPROM and 2Kbytes of RAM. The Neuron firmware is pre-programmed in an on-chip ROM. The application code is stored in the embedded EEPROM memory and may be updated over the network. The FT 3120 smart transceiver is offered in a 32-lead SOIC package as well as a compact 44-lead TQFP package.
The FT 3150 Free Topology Smart Transceiver includes a 20MHz Neuron 3150 core, 0.5Kbytes of EEPROM, and 2Kbytes of RAM. Through its external memory bus, the FT 3150 smart transceiver can address up to 58Kbytes of external memory, of which 16Kbytes of external nonvolatile memory is dedicated to the Neuron firmware. The FT 3150 transceiver is supplied in a 64-lead TQFP package.
The embedded EEPROM may be written up to 10,000 times with no data loss. Data stored in the EEPROM will be retained for at least 10 years.
Three different versions of the FT 3120 and FT 3150 Free Topology Smart Transceivers are available to meet a wide range of applications and packaging requirements.
The FT-.x1 is a through-hole communication transformer while the FT--X2 is a surface mount transformer. Either transformer can be used with the FT 3120 or FT 3150 Free Topology Smart Transceivers. the FT-.x1 and FT-.x2 transformers have similar noise immunity and performance characteristics.
Models 14212R-500, 14222R-800, 14230R450, 14240R, and 14250R-300 are compliant with the European Directive 2002/95/EC on the restriction of the use of certain hazardous substances (RoHS) in electrical and electronic equipment.
