78 kilobits per second bit rate for distances up to 500 meters
in free topology or 2700 meters in bus topology with double
terminations
t
High performance Neuron network processor core enables con-
current processing of application code and network
packets (40MHz maximum for FT 3120 smart transceiver,
20MHz maximum for FT 3150 smart transceiver)
t
4Kbytes of embedded EEPROM for application code and con-
figuration data on the FT 3120 smart transceiver and 0.5Kbytes
of embedded EEPROM for configuration data on the FT 3150
smart transceiver
t
Interface for external memory for devices with larger memory
requirements (FT 3150 smart transceiver only)
t
2Kbytes of embedded RAM for buffering network data and net-
work variables
t
11 I/O pins with 34 programmable standard I/O modes mini-
mizing external interface circuitry
t
Unique 48-bit Neuron ID in every device for network installa-
tion and management
t
Compact external transformer with patent pending
architecture providing exceptional immunity from magnetic
interference and high frequency common mode noise
t
Compatible with TP/FT-10 channels using FTT-10 and/or FTT-
10A Free Topology Transceivers and, with suitable DC block-
ing capacitors, LPT-10 Link Power Transceivers
t
Communications parameters preprogrammed for the TP/FT-10
channel at 10MHz
t
5V operation with low power consumption
t
-40 to +85°C operating temperature range
[3, 4]
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 trans-
ceiver 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]
FT 3120 transceiver in a 44-pin TQFP package
[1]
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 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 L
ON
W
ORKS
®
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 (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 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
[2]
, 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
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. T
junction
can be calculated as follows: T
junction =
T
Ambient
+ V•I•θ
JA
where
θ
JA
for 32-pin SOIC = 51°C/W,
θ
JA
for 44-pin TQFP = 43°C/W, and
θ
JA
for 64-pin TQFP = 44°C/W.
1
Typical Free Topologies Supported by the FT 3120 and FT 3150 Free Topology Smart Transceivers
Figure 1
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. 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 immunity and per-
formance characteristics.
Models 14212R-500, 14222R-800, 14230R-450, 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.
accessible device. The ShortStack firmware uses an SCI or SPI serial
interface to communicate between the host and the Smart Transceiver.
The MIP uses a high performance parallel or dual-ported RAM inter-
face.
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 opera-
tion in the presence of high frequency common mode noise on
unshielded twisted pair networks. Properly designed nodes can meet
the rigorous Level 3 requirements of EN 61000-4-6 without the need
for a network isolation choke. The transformer also offers outstanding
immunity from magnetic noise, eliminating the need for protective
magnetic 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 sepa-
rately. See FT 3120 and FT 3150 Free Topology Smart Transceiver
Ordering Information for product offerings and descriptions. The FT
3120 / FT 3150 Free Topology Smart Transceiver IC and the FT-
X1/FT-X2 Communication Transformer are designed to be used as a
pair and therefore must be implemented together 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).
Flexible I/O, Simple Configuration
The FT 3120 and FT 3150 Free Topology Smart Transceivers pro-
vide 11 I/O pins which may be configured to operate in one or more of
34 predefined standard 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 application 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 ShortStack
®
or
MIP firmware. When used with the ShortStack or MIP firmware, the
Smart Transceiver enables any OEM product with a host microcon-
troller to quickly and inexpensively become a networked, Internet-
2
Upgrade While Preserving Your Software and
Hardware Investment
The FT 3120 Free Topology Smart Transceiver is pin compatible
with Neuron 3120 Chips from Cypress and Toshiba, and the FT 3150
Free Topology Smart Transceiver is pin compatible with Neuron 3150
Chips from Cypress and Toshiba. The 6-pin FT-X1 through-hole
communication transformer is pin compatible with Echelon's 9-pin
FTT-10A Twisted Pair Transceiver, and is keyed to prevent accidental
reversal during insertion in the printed circuit card. In most cases the
FT 3120 and FT 3150 IC will directly replace a Neuron Chip, and the
FT-X1 Communication Transformer will replace the FTT-10A
Transceiver in an existing design without requiring any layout
changes, only a recompilation of the application code.
[5]
The figure below presents a block diagram view of how an
FT 3120-E4S40 IC and FT-X1 Communication Transformer will
replace a 32-pin SOIC Neuron 3120 Chip and FTT-10A Transceiver.
The FT 3120-E4S40 IC is supplied as a pin compatible 32-pin SOIC
together with an FT-X1 Communication Transformer.
[6]
Software updates necessary to support the Free Topology Smart
Transceivers on Echelon's LonBuilder
®
and NodeBuilder
®
develop-
ment tools are available from Echelon's Web site at
www.echelon.com/toolbox. Programming solutions for the FT 3120
Free Topology Smart Transceiver are available from BP
Microsystems. The FT 3120 Free Topology Smart Transceiver is also
compatible with the previous generation Model 21700 Neuron 3120
Chip Programmer from Echelon.
End-to-End Solutions
Echelon provides all of the building blocks required to successful-
ly design and field cost-effective, robust products based on the FT
3120 and FT 3150 Free Topology Smart Transceivers. Our end-to-end
solutions include a comprehensive set of development tools, network
interfaces, routers, and network tools. Pre-production design review
services, training, and worldwide technical support—including on-site
support—are available through Echelon’s LonSupport
™
technical
assistance program.
Upgrading to an FT 3120-E4S40 IC and FT-X1 Communication Transformer from a 32-pin SOIC Neuron 3120 Chip and
FTT-10A
Figure 2
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.
3
Typical FT 3120 / FT 3150 Free Topology Smart Transceiver based Node
FT-X1/
FT-X2
[6]
Figure 3
FT 3120 / FT 3150 Free Topology Smart Transceiver Block Diagram
FT-X1/FT-X2
[6]
Figure 4
4
FT 3120 / FT 3150 Free Topology Smart Transceiver IC Pin Configurations
Figure 5a
Figure 5b
Figure 5c
Notes:
7 The small dimple at the bottom left of the marking indicates pin 1.
8 NC (No Connect) — Should not be used. (These pins are reserved for internal testing.)
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