Pyxos™ FT Network Chip
11500R
®
Features
• Low-cost embedded control networking chip for use inside machines and
for extending control networks to high-performance sensor networks
• Miniaturized form factor fits into almost every sensor and actuator
• Extensible architecture for seamless integration with LonWorks® control
networks and the Internet
• Self-organizing feature configures the network without special tools
or skilled labor
• High speed deterministic operation (≤ 25ms response time)
• 312.5kbps network transmission speed
• Polarity insensitive, free topology, twisted pair wiring
• Link Power allows sending communication and power over same pair of wires
• Robust performance ideal for industrial and consumer products and
applications including automotive, buildings, office machines, and
transportation
• Exceptional data integrity with Forward Error Correction and 18 bit packet CRC
• Exceptionally high common mode noise and interference immunity
• Network pins ESD protection to over 8kV HBM
• -40°C to +85°C operating temperature range
• 20 Pin QFN 5mm x 5mm package
• RoHS-compliant
Introduction
The Pyxos platform is the embedded control networking platform introduced by Echelon
for stand-alone or LonWorks extending networking applications inside machines and in
high-performance systems such as sensor and actuator I/O busses.
Pyxos embedded control networks reduce product installation, warranty, and life-cycle
costs. Pyxos self-organizing networks reduce installation costs and equipment assembly
time by eliminating the need to use special tools or skilled labor for network configuration.
This minimizes material and labor costs. The remote diagnostics afforded by the Pyxos
platform enable new features that let manufacturers access low-level data from sensors
and actuators, such as process efficiency and energy usage. Employing these features for
preventive and predictive maintenance provides reduced life-cycle costs and improved
customer service.
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Figure 1.
Pyxos FT Transceiver Block Diagram
The Pyxos FT network chip embeds both
the protocol for a Pyxos platform and
the transceiver for communicating on
the Pyxos network. With the networking
protocol implemented inside the chip,
only application development is left
to the user. The chip is a small 5mm x
5mm sized one that fits into virtually
any sensor or actuator. The chip can be
connected directly to digital I/O without
a microcontroller, making for an ultracompact smart device. Alternately, the
chip’s serial peripheral interface (SPI) port
can be interfaced with a wide variety of
low-cost microcontrollers to accommodate
more complex I/O requirements.
fewer Points in the system). This rate of
speed allows Pyxos FT networks to be
used for closed-loop controls in process
and industrial applications, as well as
sensing and control applications that
require fast response time.
Network Architecture and
Components
• security and fire/life
Pyxos FT network consists of up to 32
Pyxos Points embedded inside sensors
and actuators, and a Pyxos Pilot to
interface with the outside world. Points
(Figure 2) can either be Unhosted (without
a microcontroller; with only digital I/Os)
or Hosted (with a microcontroller). Pilots
(Figure 3) need a microcontroller and can
either be Stand-Alone (not connected
to any external network) or Networked
(connected to a higher-level external
network e.g., LonWorks to communicate
with the outside world).
High Speed Deterministic
Response Time
A Pyxos FT network operates at 312.5
kilobits per second using a deterministic
signaling method by which all 32 Points
in the system are scanned every 25
milliseconds (proportionally faster with
Potential applications include:
• vehicular controls
• fault monitors
• propulsion controls
• HVAC systems
• lighting systems
• burner and boiler controls
• elevator cab and floor call
• safety devices
• controls
• office automation equipment
Advanced Noise Immunity
Four different network coupling options
are available to cover a wide variety of
application environments. For applications
within an enclosure, the differential
receiver in the Pyxos FT IC provides railto-rail common mode range and may be
connected directly to the network with
no additional components. For network
applications where AC mains based
common mode noise may be tens of volts,
a simple 4 component coupling circuit
provides +/-40V 50/60Hz common mode
range (far better than typical RS-485
transceivers). For extremely harsh noise
environments a transformer coupled
option provides a common mode range
of 277VAC at 50/60Hz and >50Vpp
immunity to higher frequency common
mode noise - passing the highest level of
EN61000-4-6 conducted RF immunity.
Free Topology Wiring and
Link Power
The Pyxos FT network sends both power
and data on the same wire pair, a feature
known as “Link Power”. Link power
eliminates the need for an additional pair
of power wires and interface terminals,
further reducing the cost, size, and
complexity of Pyxos FT Points. Pyxos FT
networks support free topology wiring
architecture that allows network cabling
in star, loop, daisy chain or bus topology
or any combination of these. 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.
Seamless Integration with
Outside World
Control information gathered from Pyxos
FT Points is disseminated by a Pyxos FT
Pilot to programmable logic controllers
(PLCs), data gathering panels, host
processors, LonWorks control networks,
the Internet, and beyond. The published
API makes it easy to interface with the
Pyxos Pilot. The Pyxos API uses the
same data type definitions as those
developed for LonWorks networks,
making integration with LonWorks
networks seamless.
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Block Diagrams
Figure 2. Example Pyxos Point
Figure 3. Example Pyxos Pilot
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Pin Configuration
Name
Pin Number
Type
Pin Description
CS~/ DIO2
1
Digital I/O
Chip Select Input or DIO2
INT~/ DIO3
2
Digital I/O
Interrupt Output or DIO3
SCLK/ DI4
3
Digital In
SPI Clock Input or DI4
MOSI/ DIO0
4
Digital I/O
SPI Input or DIO0
MISO/ DIO1
5
Digital I/O
SPI Output or DIO1
COUT
6
Digital Out
Clock output/tri-state
GND
7
Ground
Ground
XIN
8
Osc In
Crystal Oscillator In
XOUT
9
Osc Out
Crystal Oscillator Out
GND
10
Ground
Ground
VBIAS
11
Analog Out
Network Bias Voltage Output
VDD3
12
Power
3.3V Power
NET_B
13
Analog I/O
Network TX/RX
GND
14
Ground
Ground
NET_A
15
Analog I/O
Network TX/RX
VDD3
16
Power
3.3V Power
GND
17
Ground
Ground
GND
18
Ground
Ground
RST~
19
Digital I/O
Reset Input/Output
JOIN/MD
20
Digital In
Join/Mode pin Input
Pad Layout
The center pin on the chip bottom is connected to ground. See the Pyxos data book for
further details on pad layout and solder stencil mask layout.
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Package Diagrams
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Specifications
Features
Description
Network Connections
Polarity-insensitive
Protocol
Deterministic TDMA protocol with automatic retries on CRC error
Response Time (Reading and Writing
4-byte values in each scan)
≤25ms scan time for up to 32 Points. Scan time is proportionally faster two
with less Pyxos Points, e.g., 1.8ms for two Pyxos Points in the system
Data Integrity
Forward error correction of up to 2 bit errors per packet; 18 bit packet CRC
MAC ID
Built-in
Installation
Self-organizing network with automatic, hardwired, and manual service-
pin methods
Maximum Pyxos Points per Pyxos Pilot
32
Transmission Speed
312.5 kilobits per second, fixed polling cycle
Pyxos Network Variables (PNVs)
per hosted Pyxos Point
128 four-byte PNVs per Pyxos Point. Larger size PNVs can be defined
within total memory size available
LonWorks Network Variables per Pyxos Pilot
62 when using ShortStack, 4096 when using MIP
Network Wiring
Unshielded CAT-5 24AWG (0.5mm) and Belden 8471 16AWG (1.3mm)
twisted pair wire; see Junction Box and Wiring Guidelines application
note for cable details
Network Length in Free Topology
Free Topology (Single termination): 100m (328 feet) maximum total
wire Bus Topology (Double termination): 400m (1312 feet) maximum;
0.3m (1 foot) maximum stub lengths
Link Power
Supports 24VAC or 24VDC link power with optional external
components;
Reference designs provided for both switching and
linear power supplies Application Output Current: up to 100mA @ 3.3V DC
Coupling Options
Direct Connect (for applications within a single enclosure)
Non-isolated/Grounded
Non-isolated/Floating
Transformer-isolated (very high common mode and interference immunity)
EMI
Designed to comply with FCC Part 15 Level A and EN55022 Level A
ESD
Designed to comply with 61000-4-2 Level 4 (contact - 8kV; air - 15kV)
ESD Human Body Model (MIL-STD-883)
(for pins NET_A and NET_B)
8kV
Radiated Electromagnetic Susceptibility
Designed to comply with 61000-4-3 Level 3 (10Vrms)
Fast Transient/Burst Immunity
Designed to comply with 61000-4-4 Level 4 (2kV)
Surge Immunity
Designed to comply with 61000-4-5 Level 3 (2kV)
Conducted RF Immunity
Designed to comply with 61000-4-6 Level 3 (10Vrms)
Common Mode Range (0 – 60Hz)
277Vrms with Transformer-isolated coupling
+/-40V with Non-isolated/Grounded coupling
I/O
4 digital I/Os and 1 digital input without a microcontroller,
8mA drive, 5V tolerant for LEDs, digital I/O, and transistors
Pyxos Host Microcontroller Interface
SPI (Serial Peripheral Interface)
Package
20 Pin QFN 5mm x 5mm package
Operating Voltage
3.3V ±10%
Operating Temperature
-40ºC to +85ºC
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®
Ordering Information
Echelon Product
Echelon Model Number
Pyxos FT Communication IC
11500R-300 (Dry Pack of Five Tubes)
11500R-5000 (Tape and Reel Package)
Pyxos FT Communication IC Samples (Qty 5)
(Includes samples of Network Isolation
Coupling Transformers)
11500R-ES
Pyxos FT Evaluation Kit
11000R-10-1P
Non-Echelon Product
Model Number
Network Isolation Coupling Transformer*
TMS80040CS
Switching Power Supply Transformer*
TMS60563CS
* Available from:
Transtek Magnetics
1900 W. Grant Road
Tuscon, AZ, USA 85745
(800) 378 0015
Copyright © 2005-2006, Echelon Corporation. Echelon, LON, LonWorks, LonMark, LonBuilder, NodeBuilder, LonManager, LonTalk, LonUsers, LonPoint, Digital Home, Neuron, 3120,
3150, LNS, i.LON, LonWorld, ShortStack, Panoramix, LonMaker, the Echelon logo, and the LonUsers logo are trademarks of Echelon Corporation registered in the United States
and other countries. Pyxos, LonLink, LonResponse, LonSupport, LONews, Open Systems Alliance, OpenLDV, Powered by Echelon, LNS Powered by Echelon, Panoramix Powered
by Echelon, LonWorks Powered by Echelon, Networked Energy Services Powered by Echelon, NES Powered by Echelon, and Thinking Inside the Box are trademarks of Echelon
Corporation. Other trademarks belong to their respective holders.
Disclaimer
Neuron Chips, Free Topology Twisted Pair Transceiver Modules, and other OEM Products were not designed for use in equipment or systems which involve danger to human
health or safety or a risk of property d
amage and Echelon assumes no responsibility or liability for use of the Neuron Chips or Free Topology Twisted Pair Transceiver Modules in
such applications. ECHELON MAKES AND YOU RECEIVE NO WARRANTIES OR CONDITIONS, EXPRESS, IMPLIED, STATUTORY OR IN ANY COMMUNICATION WITH YOU, AND
ECHELON SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
003-0406-04
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