FT 3120® and FT 3150® Free
Topology Smart Transceivers
Features
• Combines an ANSI/CEA 709.3-1999 compliant free topology twisted pair
transceiver with a Neuron 3120 or Neuron 3150 network processor core
• Supports polarity insensitive free topology star, daisy chain, bus, loop, or
mixed topology wiring
• 78 kilobits per second bit rate for distances up to 500 meters
in free topology or 2700 meters in bus topology with double terminations
• High performance Neuron network processor core enables concurrent pro-
cessing of application code and network
packets (40MHz maximum for FT 3120 smart transceiver, 20MHz maximum
for FT 3150 smart transceiver)
FT 3120 transceiver in a 44-pin TQFP
package[1]
• 4Kbytes of embedded EEPROM for application code and configuration data
on the FT 3120 smart transceiver and 0.5Kbytes of embedded EEPROM for
configuration data on the FT 3150 smart transceiver
• Interface for external memory for devices with larger memory requirements
(FT 3150 smart transceiver only)
• 2Kbytes of embedded RAM for buffering network data and network variables
• 11 I/O pins with 34 programmable standard I/O modes minimizing external in-
terface circuitry
• Unique 48-bit Neuron ID in every device for network installation and manage-
ment
• Compact external transformer with patent pending
architecture providing exceptional immunity from magnetic interference and
high frequency common mode noise
• Compatible with TP/FT-10 channels using FTT-10 and/or FTT-10A Free Topol-
ogy Transceivers and, with suitable DC blocking capacitors, LPT-10 Link
Power Transceivers
• Communications parameters preprogrammed for the TP/FT-10 channel at
10MHz
• 5V operation with low power consumption
• -40 to +85°C operating temperature range[3, 4
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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.
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-
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
Figure 1. Typical Free Topologies Supported by the FT 3120 and FT 3150
Free Topology Smart Transceivers
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.
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netic shields in most applications. The
transformer is provided in a potted, 6-pin,
through-hole plastic package.
FT-X1/FT-X2 Communication Transformers
must be ordered separately. See FT 3120
and FT 3150 Free Topology Smart Trans-
ceiver Ordering Information for product of-
ferings and descriptions. The FT 3120 / FT
3150 Free Topology Smart Transceiver IC
and the FT-X1/FT-X2 Communication Trans-
former are designed to be used as a pair
and therefore must be implemented to-
gether in all designs. No transformer other
than the FT-X1 or FT-X2 Communication
Transformer may be used with either the
FT 3120 or FT 3150 Free Topology Smart
Transceiver IC, or the smart transceiver
warranty will be void.
A typical FT 3120 or FT 3150 based device
requires a power source, crystal and an I/O
interface to the device being controlled
(see Figure 3 for a typical FT 3120 / FT
3150 based device).
Figure 2. Upgrading to an FT 3120-E4S40 IC and FT-X1 Communication Transformer from a 32-pin SOIC Neuron
3120 Chip and FTT-10A
Notes:
5 Certain devices providing Rx packet detection LEDs may not be pin compatible with the FT 3120 and FT 3150 Free Topology Smart Transceiver.
Contact Echelon for details.
6 The FT-X1/FT-X2 Communication Transformer must be ordered separately and must be used with the FT 3120 / FT 3150 Free Topology Smart
Transceiver IC in all designs.
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