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Description

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 per-

formance 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 commu-

nicate with devices using Echelon's

FTT-10A Free Topology Transceiver, and,

when used with suitable DC isolation ca-

pacitors, the LPT-11 Link Power Transceiver.

The free topology transceiver supports po-

larity insensitive cabling using a star, bus,

daisy-chain, loop, or combination topology

(see Figure 1)—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 al-

lowing the wiring to be installed in the

most expeditious and cost-effective man-

ner. It also simplifies network expansion by

eliminating restrictions on wire routing,

splicing, and node placement.

The FT 3120 Free Topology Smart Trans-

ceiver 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[2], and

includes 4Kbytes of EEPROM and 2Kbytes

of RAM. The Neuron firmware is pre-pro-

grammed in an on-chip ROM. The applica-

tion code is stored in the embedded

EEPROM memory and may be updated

over the network. The FT 3120 smart trans-

ceiver is offered in a 32-lead SOIC package

as well as a compact 44-lead TQFP pack-

age.

The FT 3150 Free Topology Smart Trans-

ceiver 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.[3]

Three different versions of the FT 3120 and

FT 3150 Free Topology Smart Transceivers

are available to meet a wide range of appli-

cations and packaging requirements. See

FT 3120 and FT 3150 Free Topology Smart

Transceiver Ordering Information below for

product offerings and descriptions.

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 im-

munity and performance characteristics.

Models 14212R-500, 14222R-800, 14230R-

450, 14240R, and 14250R-300 are compli-

ant with the European Directive

2002/95/EC on the restriction of the use of

certain hazardous substances (RoHS) in

electrical and electronic equipment.

Flexible I/O, Simple

Configuration

The FT 3120 and FT 3150 Free Topology

Smart Transceivers provide 11 I/O pins

which may be configured to operate in one

or more of 34 predefined standard

Notes:

1 See table on FT 3120 and FT 3150 Free Topology Smart Transceiver Ordering Information for other product offerings and description.

2 The FT 3120 Free Topology Smart Transceiver is designed to run at frequencies up to 40MHz using an external clock oscillator. External oscillators may

take several milliseconds to stabilize after power-up. The FT 3120 Free Topology Smart Transceiver operating at 40MHz should be held in reset until the

CLK1 input is stable. With some oscillators, this may require the use of a power-on-reset-pulse stretching Low-Voltage Detection chip/circuit. Check the

oscillator specifications for more information on startup stabilization times.

3 EEPROM programming must be limited to -25 to 85°C for a 10-year data retention over the -40 to 85°C operating temperature range.

4 Maximum junction temperature should not exceed 105ºC. Tjunction can be calculated as follows: Tjunction = TAmbient + V•I•

θJA where θJA for 32-pin

SOIC = 51°C/W,

θJA for 44-pin TQFP = 43°C/W, and θJA for 64-pin TQFP = 44°C/W.

Figure 1. Typical Free Topologies Supported by the FT 3120 and FT 3150

Free Topology Smart Transceivers

input/output modes. Combining a wide

range of I/O models with two on-board

timer/counters enable the FT 3120 and FT

3150 smart transceivers to interface to ap-

plication circuits with minimal external logic

or software development.

Easy Interface to Any

Host MCU

The FT 3120 and FT 3150 Free Topology

Smart Transceivers can be easily interfaced

to other host MCUs via Echelon’s Short-

Stack® or MIP firmware. When used with

the ShortStack or MIP firmware, the Smart

Transceiver enables any OEM product with

a host microcontroller to quickly and inex-

pensively become a networked, Internet-

accessible device. The ShortStack firmware

uses an SCI or SPI serial interface to com-

municate between the host and the Smart

Transceiver. The MIP uses a high perform-

ance parallel or dual-ported RAM interface.

Advanced Network Noise

Protection

The FT 3120 and FT 3150 Free Topology

Smart Transceivers are composed of two

components — the FT 3120/FT 3150 IC and

an external communication transformer.

The transformer enables operation in the

presence of high frequency common mode

noise on unshielded twisted pair networks.

Properly designed nodes can meet the rig-

orous Level 3 requirements of EN 61000-4-

6 without the need for a network isolation

choke. The transformer also offers out-

standing immunity from magnetic noise,

eliminating the need for protective mag-