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Differences between LPT-10 and LPT-11 Link Power

Transceivers

The following sections discuss the functional differences between the LPT-10

and LPT-11 transceivers, as well as differences in form, plus address the

modifications required for migrating from the LPT-10 to the LPT-11.

Functional Differences

The LPT-11 transceiver is approximately 10 times more immune to high

frequency common mode noise than the LPT-10. The LPT-11 transceiver can

operate reliably in the presence of 10Vrms common mode noise. This enables

properly designed devices to meet the European EN 61000-4-6 Level 3

specifications.

The LPT-11 transceiver does not support a Wake-Up Timer feature. The

wake-up timer was provided to “wake” the Neuron Chip from SLEEP mode

periodically to sample inputs/outputs and communicate with the network.

Note:

If there are designs in which LEDs have been connected to

TXEN/RX_ACTIVE pins, such an implementation will no longer be feasible.

This implementation was not previously supported by Echelon.

The LPT-11 transceiver does not support operation at 1.25MHz.

The LPT-11 transceiver supports operation at 20MHz.

Differences In Form

The LPT-11 transceiver has 2 less pins than the LPT-10: 14 pins on the LPT-

11 transceiver versus 16 pins on the LPT-10 transceiver. The 2 pins that have

been eliminated are # 15 WAKEUP-OUT and #16 RX_ACTIVE

The WAKEUP-OUT pin on the LPT-10 transceiver was eliminated since the

wake up timer feature is no longer supported. The RX_ACTIVE pin is no

longer needed since a physical layer repeater configuration can now be

supported without the need for RX_ACTIVE.

Certain other pins have been designated No Connect (NC) pins, i.e., these pins

are not connected internally. The newly designated NC pins should not affect

existing LPT-10 transceiver designs when they migrate to the LPT-11

transceiver. Pin changes are as follows:

•

Pin # 8 CLKSEL0 becomes a NC.

•

Pin # 9 TXD/CLKSEL1 becomes TXD.

B-2 Appendix B - Differences Between LPT-10 and LPT-11

Summary of Contents for LonWorks LPT-11

Page 1: ...LONWORKS LPT 11 Link Power Transceiver User s Guide Version 1 ECHELON C o r p o r a t i o n 078 0198 01A ...

Page 2: ... Modules in such applications Parts manufactured by vendors other than Echelon and referenced in this document have been described for illustrative purposes only and may not have been tested by Echelon It is the responsibility of the customer to determine the suitability of these parts for each application ECHELON MAKES AND YOU RECEIVE NO WARRANTIES OR CONDITIONS EXPRESS IMPLIED STATUTORY OR IN AN...

Page 3: ...nd Capacitor Selection for Low Current Applications 2 9 3 Mechanical Considerations 3 1 Mechanical Footprint 3 2 4 Power Output 4 1 Transceiver Output Power 4 2 Powering Non Isolated Devices 4 4 5 Network Cabling and System Performance 5 1 Network Overview 5 2 System Performance and Cable Selection 5 4 System Specifications 5 5 Transmission Specifications 5 5 Power Specifications Simplified Form 5...

Page 4: ...ent Hardware Setup 7 5 Release Hardware Setup 7 5 8 References 8 1 Reference Documentation 8 2 Appendix A Physical Layer Repeaters A 1 Physical Layer Repeaters A 2 Appendix B Differences Between LPT 10 and LPT 11 B 1 Differences Between LPT 10 and LPT 11 Link Power Transceivers B 2 Functional Differences B 2 Differences in Form B 2 Modifications for Migrating from the LPT 10 to the LPT 11 Transcev...

Page 5: ...ial Manchester coded communication transceiver a switching power supply that draws power from the twisted pair network and connections for the Neuron Chip Communications Port CP lines and the twisted pair network The LPT 11 transceiver eliminates the need to use a local power supply for each device since device power is supplied by a central power supply over the same twisted wire pair that handle...

Page 6: ... transceiver eliminates the need for local power supplies at each device resulting in equipment and labor cost savings The LPT 11 transceiver is compatible with Echelon s FTT 10A Free Topology Transceiver and FT 3120 FT 3150 Smart Transceivers referred to hereafter as FT 31xx devices and these transceivers can communicate with each other on a single twisted pair cable This capability provides an i...

Page 7: ...data and power wiring must be changed accordingly often resulting in network down time until the new connections can be established The best solution for reducing installation and maintenance costs and simplifying system modifications is a free topology communication system that combines power and data on a common twisted wire pair Echelon s link power technology offers just such a solution and pr...

Page 8: ...the larger the system the greater the savings Moreover if standby batteries are used then additional savings will be realized throughout the life of the system since only one set of batteries will require service The link power system uses a single point of ground at the LPI 10 module and all of the LPT 11 transceivers electrically float relative to the local ground Differential transmission minim...

Page 9: ...nal link power systems can be added by interconnecting transceivers using the repeater function The repeaters will transfer LonTalk packets between the two systems doubling the number of transceivers as well as the length of wire over which they communicate The repeater function permits a link power system to grow as system needs expand without retrofitting existing controllers or requiring the us...

Page 10: ...r s Guide 078 0141 01 Neuron C Programmer s Guide 078 0002 01 LonBuilder Startup and Hardware Guide 078 0003 01 LONWORKS LPI 10 Link Power Interface Module User s Guide 078 0104 01 LONWORKS FTT 10A Free Topology Transceiver User s Guide 078 0156 01 FT 3120 FT 3150 Smart Transceiver Data Book 005 0139 01 LONWORKS Product Catalog Catalog Spring02 ...

Page 11: ... 11 Link Power Transceiver s 14 pins provide a polarity insensitive connection to the twisted pair network an interface to the Neuron Chip communications port and a switching power supply LONWORKS LPT 11 Transceiver User s Guide 2 1 ...

Page 12: ...insensitive NET_B 2 Connection to TP network polarity insensitive V 3 Power supply input voltage 35VDC INDUCTOR 4 Power supply inductor connection Vcc 5 5VDC power output GND 6 Power supply ground CLK 7 Transceiver clock input from Neuron Chip NC 8 No Connect not connected internally TXD 9 Neuron Chip CP1 RXD 10 Neuron Chip CP0 NC 11 No Connect not connected internally NC 12 No Connect not connect...

Page 13: ...3 Neuron 3120 or 3150 Chip GROUND GUARD IO0 IO10 To Application Electronics 5V CLOCK CIRCUIT 5V C3 GND C1 L1 C2 To Network LPT 11 Link Power Transceiver NC NC NC NC Figure 2 1 LPT 11 Transceiver to Neuron Chip Interconnections LONWORKS LPT 11 Transceiver User s Guide 2 3 ...

Page 14: ...pling The LPT 11 transceiver can operate at 20 10 5 or 2 5MHz Operation at 2 5MHz does not comply with LONMARK interoperability guidelines for the TP FT 10 channel 1 25 MHz operation is not supported The operating frequency is automatically detected on the CLK pin Neuron Chip Communications Port CP Lines The LPT 11 transceiver transmits and receives LonTalk network packets via the Neuron Chip s di...

Page 15: ...the left in figure 2 2 then C1 should be moved up and to the right above L1 L1 and C2 can shift down slightly to minimize the trace lengths for L1 C1 and C2 in this variation on the original layout Note that the ground plane on the solder side of the board becomes more important in this variation since the ground pin of C1 is now on the right hand side of the transceiver and a low impedance path b...

Page 16: ...at L1 is shown in figure 2 2 with a dot marking that is oriented toward the transceiver In the Taiyo Yuden LHL08 series of inductors the dot identifies which pin is connected to the inner portion beginning of the cylindrical wire winding on the ferrite slug Since the input to L1 is a 35V switching waveform and the output is a smooth 5VDC it is best to orient the inductor so that the windings with ...

Page 17: ...onnector or wires RF noise may couple onto the network cable and cause EMI problems With these constraints in mind it is apparent that the best place to locate the Neuron Chip is in the lower right corner of figure 2 2 with an orientation that places the Neuron Chip s CLK2 line closest to the transceiver s CLK input pin This position and orientation work well for both the Neuron 3120 and 3150 Chip...

Page 18: ...he extra expense Table 2 4 Examples of C1 Capacitor Selections 100µF 63V For Consideration Manufacturer Series Part Number Temperature Range Panasonic EEUFC1J101 40 C to 85 C Vishay EKE00DC310J00 40 C to 85 C Manufacturers for the Vcc output capacitor C2 are listed in table 2 5 C2 has the following key specifications that must be met over the device s operating temperature range C 22µF 20 DCWV 10V...

Page 19: ...tituted for those components noted above These components should have ratings of 40 C to 85 C minimum For the C1 and C2 components Echelon recommends the use of a high temperature rated capacitor 105 C minimum due to the increased component operating life available with this type of construction Table 2 6 Optional Component Selection for Low Current Applications up to 25mA Component Description L1...

Page 20: ...2 10 Electrical Interface ...

Page 21: ... discusses the mechanical footprint and connectors of the LPT 11 Link Power Transceiver Details of mounting the transceiver to an application electronics board containing a Neuron Chip are provided LONWORKS LPT 11 Transceiver User s Guide 3 1 ...

Page 22: ... issues as discussed in Chapter 6 of this document Figure 3 1 shows the maximum height of the LPT 11 transceiver as it is shipped from the factory The user has the option of constructing a fixture to bend the connector pins to reduce the overall height of the printed circuit board assembly on which the transceiver is mounted The LPT 11 has a notch on the top edge above Pin 1 as shown in figure 3 1...

Page 23: ...4 Power Output This section describes the power supply portion of the LPT 11 Link Power Transceiver and provides suggestions for using the 5V output current LONWORKS LPT 11 Transceiver User s Guide 4 1 ...

Page 24: ...al circuitry The LPT 11 transceiver s power supply circuit will begin to limit current on any peak instantaneous currents that exceed 100mA and this will cause a droop in Vcc Note that the internal circuitry of the transceiver itself derives a small amount of current from the switching power supply directly and this current consumption does not reduce the 100 mA available current limit The power s...

Page 25: ...Co1 to set the cutoff frequency of the R C filter at least 10x below the frequency fn of noise sensitivity in the circuit being powered That is choose Co1 10 2πRfn 3 Ro must be large enough to keep the effective capacitance of Co1 as seen by the LPT 11 transceiver to less than 5 of the transceiver s 22µF output capacitor C2 This can be accomplished by ensuring that Ro 100Ω Co1 1µF The L C filter s...

Page 26: ...uce EMI WARNING THE COMBINED CAPACITANCE OF ALL THE DECOUPLING CAPACITORS FROM VCC TO GND SHOULD NOT EXCEED 1 0µF TOTAL DECOUPLING CAPACITANCE IN EXCESS OF 1 0µF CAN CAUSE UNSTABLE POWER SUPPLY PERFORMANCE Powering Non Isolated Devices In order to provide reliable common mode rejection the link power system operates with one earth ground connection at the LPI 10 module and all LPT 11 transceivers ...

Page 27: ...1 5 Network Cabling and System Performance This chapter provides information about cabling and network connections for the LPT 11 Link Power Transceiver This information includes a discussion of wire characteristics and power distribution issues ...

Page 28: ...point along the network wiring as can the LPI 10 module and its associated power supply This capability simplifies system installation and makes it easy to add devices should the system need to be expanded Figures 5 1 through 5 5 present five different network topologies Supply Interface Figure 5 1 Singly Terminated Bus Topology Termination Supply Interface Figure 5 2 Doubly Terminated Bus Topolog...

Page 29: ...he event that the limits on the number of transceivers or total wire distance are exceeded then a link power physical layer repeater can be added to interconnect two link power systems and double the overall system capability see Appendix A Echelon s media routers can also be used to interconnect the link power system with any other LONWORKS channel ...

Page 30: ...a AWG Rloop Ω km C nF km Vprop of c Belden 85102 single twisted pair stranded 9 29 unshielded plenum 1 3mm 16 28 56 62 Belden 8471 single twisted pair stranded 9 29 unshielded nonplenum 1 3mm 16 28 72 55 Level 4 22AWG twisted pair typically solid unshielded 0 65mm 22 106 49 67 JY St Y 2x2x0 8 4 wire helical twist solid shielded 0 8 mm 20 4 73 98 41 Category 5 UTP EIA TIA 568A 0 5mm 24 168 50 58 If...

Page 31: ...hat the following constraint is met 1 x number of LPT 11 transceivers 2 x number of FTT 10A transceivers 128 The average temperature of the wire must not exceed 55 C although individual segments of wire may be as hot as 85 C The sum of the application current of all the devices in a segment must not exceed 3 2A at 5V Transmission Specifications Table 5 2 Doubly Terminated Bus Topology Specificatio...

Page 32: ...ifications apply to individual branches The closer the devices on a branch are to the LPI 10 module the more devices that can be on that branch Similarly the fewer the devices on a branch the longer that branch can be Both nominal and worst case power specifications for the performance of the link power system with both lumped and distributed loads are shown in tables 5 4 through 5 7 The following...

Page 33: ...28 20 400 meter branch length Lumped loading or otherwise distributed application current 25 mA 128 101 devices 50 mA 64 50 100 mA 32 25 Table 5 5 Simplified Power Specifications Using JY St Y 2x2x0 8 Wire Nominal Worst Case Units 320 meter branch length Evenly distributed loading along a bus application current 25 mA 128 96 devices 50 mA 64 48 100 mA 32 24 320 meter branch length Lumped loading o...

Page 34: ...A 18 13 100 mA 9 6 Table 5 7 Simplified Power Specifications Using Category 5 Wire Nominal Worst Case Units 400 meter branch length Evenly distributed loading along a bus application current 25 mA 47 34 devices 50 mA 23 17 100 mA 12 8 400 meter branch length Lumped loading or otherwise distributed application current 25 mA 23 16 devices 50 mA 11 8 100 mA 6 4 Power Specifications for Extended Perfo...

Page 35: ...e must not exceed a constant I1 d1 I2 d2 I3 d3 K α where K is the nominal value dependent on wire type K 1135 Amp Meters for Belden 85102 and Belden 8471 16 AWG K 430 Amp Meters for JY St Y 2x2x0 8 K 300 Amp Meters for Level 4 22AWG K 190 Amp Meters for Category 5 α 1 1 0 00393 temp 25 C accounting for average wire temperature At 25 C α 1 Note that α is greater than one when average wire temperatu...

Page 36: ...ngths of sub branches can be ignored for this calculation reducing the effective d and improving performance To determine when the lengths of stubs or sub branches can be ignored for power calculation begin at the ends of the branches and move toward the LPI 10 module Upon arriving at a branching point calculate the sum of products I1 ds1 I2 ds2 for every sub branch where I is the application curr...

Page 37: ...mA each at the same location Use the equivalent power network from Step Three when applying the extended power performance specification Example 1 Actual Network 2x100 2x100 4x100 25 50 25 5x25 100 2x25 25 25 50 25 4x100 100 LPI 10 Simplification Step One 200 25 50 75 125 100 25 400 LPI 10 800 Simplification Step Two 225 25 50 75 125 100 400 LPI 10 800 Simplification Step Three and equivalent netw...

Page 38: ...ow would not be allowed Table 5 4 worst case allows only a truncated version of the network which has 96 devices and a 160 meter branch length instead of 128 devices and a 240 meter branch length All devices have 25 mA 1 LPUL of application current The wire type is JY St Y 2x2x0 8 and average wire temperature is 25 C Example 2 Actual Network allowed by extended performance power specification 50m ...

Page 39: ...rface with jumper at 2 CPLR setting provides one termination 2 An RC network figure 5 6 provides the second termination To Network C1 R1 C2 C1 C2 100µF 50V R1 105Ω 1 1 8W Note Observe polarity shown for C1 and C2 Figure 5 6 RC Network Commissioning LPT 11 Transceivers LPT 11 transceivers can be connected to any point of the twisted pair cable provided that the total wire and power limits are not e...

Page 40: ...5 14 Network Cabling and System Performance ...

Page 41: ...This chapter looks at design issues and includes discussions of Electromagnetic Interference EMI Electrostatic Discharge ESD and surge for the LPT 11 Link Power Transceiver LONWORKS LPT 11 Transceiver User s Guide 6 1 ...

Page 42: ...ics is important to ensure that an LPT 11 transceiver will achieve the desired level of EMC In a link power network the devices float relative to local safety earth ground because the single point of earth ground in the network is at the LPI 10 module Since no explicit connection to earth ground is allowed at a link power device the usual EMC techniques involving grounding do not apply The techniq...

Page 43: ...to flow When Vgate is pulled down to logic ground the voltage of logic ground with respect to earth ground will increase slightly When Vgate pulls up to Vcc logic ground will be pushed down slightly with respect to earth ground As Cleak SIGNAL increases a larger current flows during Vgate transitions and more common mode RF current couples to the network twisted pair This common mode RF current ca...

Page 44: ...nents requires more Vcc decoupling and may require a four layer PC board to maintain an RF quiet Vcc and logic ground If the link power device s application circuitry uses fast digital signals the same EMC design rules apply Some link power devices with fast circuitry such as DSP engines and memory arrays etc may require extra RF attenuation between the LPT 11 transceiver and the twisted pair netw...

Page 45: ...e European Community has adopted legal requirements for ESD testing of products Designing Systems for ESD Immunity As with the EMI design issues discussed above ESD hardening of link power devices is different than hardening products that have an explicit earth ground connection If Cleak GND can be kept small say 5pF and if the link power device is housed inside a plastic enclosure that offers no ...

Page 46: ...alanced symmetric fashion common mode transients have minimal effect on transmission The single point of earth reference for a link power network segment is the LPI 10 module When the LPI 10 module clamps an incident voltage transient a residual differential transient voltage may result across the twisted pair conductors This residual voltage is seen by the LPT 11 devices For small transient volta...

Page 47: ...t excessive surges or lightning strike energy to ground and prevent their entry inside the building via the network Data line lightning surge arresters should also be used at each building entrance and connected to the network data lines Therefore two arresters one for each conductor of the twisted pair are required and Echelon recommends the use of the gas discharge type The gas discharge type of...

Page 48: ...ransceiver operating in typical two layer application boards to verify that the transceiver complies with the five applicable EN 61000 4 test requirements formerly known as IEC 1000 4 tests Provided that a device s PCB is designed following the guidelines in Chapter 2 the LPT 11 transceiver should pass the EN 61000 4 tests described in table 6 2 Table 6 2 EN 61000 4 Test Immunity Levels EN Test De...

Page 49: ...ed on a non conducting table using specialized surge generation equipment The surges are injected directly into the network wiring via a coupling circuit See figure 10 of EN 61000 4 5 formerly figure 11 of IEC 801 5 Under the test proper operation continues with the occasional loss of a packet Level 2 testing is performed with up to 1kV surges and Level 3 testing is performed with up to 2kV surges...

Page 50: ...sting of an LPT 11 based device and unshielded twisted pair network wire is shown in figure 6 4 Figure 6 4 Typical EN 61000 4 6 Test Set up for Unshielded Twisted Pair UTP For the EN 61000 4 6 tests the EUT is placed on a 10cm high non conducting support on top of the metal ground plane If the EUT s chassis is connected to earth ground in typical installations then it should be connected directly ...

Page 51: ...ad of the T2 CDN and the shield should be connected to earth ground Figure 6 5 Typical EN 61000 4 6 Test Set up for Shielded Twisted Pair STP Figure 6 6 shows the EN 61000 4 6 common mode CM noise immunity of the LPT 11 transceiver in a typical device during a 15Vrms scan using unshielded twisted pair The LPT 11 transceiver based device passes the 10Vrms EN 61000 4 6 Level 3 scan with good margin ...

Page 52: ...00 100000 00 1000000 00 10000000 00 100000000 00 Frequency Hz Amplitude Vrms 0 00 5 00 10 00 15 00 20 00 25 00 30 00 35 00 40 00 45 00 50 00 55 00 60 00 65 00 70 00 75 00 80 00 Amplitude Vp p LPT 11 Transceiver LPT 10 Transceiver Figure 6 6 LPT 11 Common Mode Noise Immunity 6 12 Design Issues ...

Page 53: ...tegration of the LPT 11 Link Power Transceiver using the LonBuilder Developer s Workbench and NodeBuilder Development Tool It covers considerations relating to channel definition and custom device image generation LONWORKS LPT 11 Transceiver User s Guide 7 1 ...

Page 54: ...connectors Refer to the LonBuilder Hardware Guide and LONWORKS SMX Transceiver Installation Instructions for detailed instructions on installing the SMX adapter and FTM 10 transceiver Warning A common mistake is to forget to reposition the backplane transceiver jumpers on the LonBuilder Emulator to the External Transceiver setting prior to installing the SMX adapter Also confirm jumper settings fo...

Page 55: ... LonBuilder Development Station can approximate the network performance of an LPT 11 transceiver This is accomplished by creating a channel with TP FT 10 selected as the transceiver type setting Enforce Std Type to No and changing the Comm Mode type to Differential Once the TP FT 10 channel definition has been created the hardware definition for the target platform must be defined During developme...

Page 56: ... hardware step is not a requirement because the programmable application image file nxe extension from the development build can be used to program the target hardware However for target hardware designs that use flash memory to store the application the LonBuilder tool can load the application image over the network To select the release hardware as a target for a build click the App Node button ...

Page 57: ...st have an LNS compatible network interface with a TP FT 10 transceiver Alternatively you can use a router between the NodeBuilder computer and the LTM 10A platform if they use incompatible transceivers The LTM 10A platform has a 10MHz input clock If the release hardware uses a different input clock rate the design of the application must be tolerant of the changed execution performance Release Ha...

Page 58: ...ser Templates folder to the Release folder of the device template to complete the procedure You can update the user hardware template at any time by double clicking the template icon and entering the changes Your new changes will affect any projects opened and compiled using this template A Build All may be required if you change a hardware template without making any other changes Warning Flash m...

Page 59: ...8 References This section provides a list of the reference material used in the preparation of this manual LONWORKS LPT 11 Transceiver User s Guide 8 1 ...

Page 60: ...on part number 005 0023 01 Textbook References Protection of Electronic Circuits from Overvoltages by Ronald B Standler John Wiley Sons 1989 EMC Documents FCC Part 15 Subpart B Class B Using CISPR 22 1997 Class B ANSI C63 4 1992 method EN 55024 1998 EN 61000 4 2 1995 Electrostatic Discharge EN 61000 4 3 1997 Radiated Immunity EN 61000 4 4 1995 Electrical Fast Transient Burst EN 61000 4 5 1995 Surg...

Page 61: ...LONWORKS LPT 11 Transceiver User s Guide A 1 Appendix A Physical Layer Repeaters This section explains the physical layer repeater function of the LPT 11 transceiver ...

Page 62: ...l layer repeater function permits a link power system to grow as system needs expand without retrofitting existing controllers or requiring the use of specialized bridges Note that systems requiring high levels of network traffic may benefit from the use of LONWORKS routers which forward packets only when necessary LONMARK Interoperability requires that there be a maximum of one repeater between a...

Page 63: ...ng current for the FTT 10A transceivers the oscillator and any other circuitry in the physical layer repeater Note that a toroidal or shielded inductor may be needed for the L1 inductor in the LPT 11 DC DC converter circuit in physical layer repeaters Please see Appendix D of the FTT 10A Free Topology Transceiver User s Guide for more information A packet that is received on any network segment is...

Page 64: ...Network Segment B UA NET_A NET_B V TXD RXD LPT 11 5V C1 L1 NET1 NET2 Network Segment A INDUCTOR C3 C2 CLK GND VCC C4B C5B 5V C1B R1B R2B D1B D2B GND T2 T1 TXD RXD CLK Vcc See Chapter 2 for LPT 11 transceiver component values L1 and C1 C2 C3 C1B 0 1 µF Note that a toroidal or shielded inductor should be used for L1 on all physical layer repeaters C3B 22µF 50V polar see FTT 10A Free Topology Transce...

Page 65: ... VCC GND T2 FTT 10A VCC T1 CLK TXD RXD GND T2 See text in FTT 10A User Guide See Chapter 2 for LPT 11 transceiver component values L1 and C1 C2 C3 C1B 0 1 µF Note that a toroidal or shielded inductor should be used for L1 on all physical layer repeaters C3B 22µF 50V polar see FTT 10A Free Topology Transceiver User s Guide C4B 22µF 50V polar see FTT 10A Free Topology Transceiver User s Guide Other ...

Page 66: ...E GND T2 TXD RXD CLK VCC Add power supply bypass capacitors not shown next to oscillator 74HCT4020 and PAL See Chapter 2 for LPT 11 transceiver component values L1 and C1 C2 C3 C1B 0 1 µF Note that a toroidal or shielded inductor should be used for L1 on all physical layer repeaters C4B 22µF 50V polar see FTT 10A Free Topology Transceiver User s Guide C5B 0 1 µF X7R or Y5V ceramic PAL requires pro...

Page 67: ...Appendix B Differences Between LPT 10 and LPT 11 This appendix contains information on differences in design from the LPT 10 to the LPT 11 transceiver LONWORKS LPT 11 Transceiver User s Guide B 1 ...

Page 68: ...X_ACTIVE pins such an implementation will no longer be feasible This implementation was not previously supported by Echelon The LPT 11 transceiver does not support operation at 1 25MHz The LPT 11 transceiver supports operation at 20MHz Differences In Form The LPT 11 transceiver has 2 less pins than the LPT 10 14 pins on the LPT 11 transceiver versus 16 pins on the LPT 10 transceiver The 2 pins tha...

Page 69: ...n Chip to put LPT 10 transceiver into the sleep mode This functionality is no longer required in the LPT 11 transceiver since the SLEEP mode is not supported by the LPT 11 transceiver Pin 14 WAKEUP CAP becomes NC In the LPT 10 transceiver the WAKEUP CAP pin was used to set the frequency of the Wake Up Timer This functionality is no longer needed since wake up timer is not supported on the LPT 11 t...

Page 70: ...B 4 Appendix B Differences Between LPT 10 and LPT 11 ...

Page 71: ...ransceiver Based Device Checklist This appendix includes a checklist to ensure that products using the LPT 11 transceiver meet the specifications presented in this user s guide LONWORKS LPT 11 Transceiver User s Guide C 1 ...

Page 72: ... LPT 11 transceiver but it is not compatible with the LONMARK TP FT 10 channel 4 If required a Low Voltage Interrupt LVI circuit with open collector output such as the Motorola MC33064 is used to supply a reset signal to the Neuron Chip See the appropriate Neuron Chip Databook for details on when an LVI is needed LPT 11 PCB Layout Item Check When Completed Description 5 The network connector LPT 1...

Page 73: ... criteria over the device s operating temperature range C 100µF 20 DCWV 63V Iripple 200mArms 100kHz ESR 1 2Ω 100kHz 15 The DC DC output capacitor C2 meets the following criteria over the device s operating temperature range C 22µF 20 DCWV 10V Iripple 200mArms 100kHz ESR 1 2Ω 100kHz 16 For applications that require no more than 25mA of sustained peak Icc application current L1 C1 and C2 meet at lea...

Page 74: ...ice operates with 2 5MHz Neuron Chip clock it will not be used on any networks that use the standard TP FT 10 comm parameters Link Power Network Considerations Item Check When Completed Description 25 The network uses a wire type listed in tables 5 2 and 5 3 26 The network length obeys the datacomm transmission specifications described in tables 5 2 and 5 3 27 The network also obeys the power limi...

Page 75: ...otal segments and the peak Icc loading is no more than 100mA total 32 For physical layer repeaters that operate from 0 C to 85 C a circuit shown in figure A 3 or A 4 is used 33 For physical layer repeaters that operate below 0 C the PAL based circuit shown in figure A 5 is used 34 The LPT 11 switching inductor L1 is a toroid or a shielded inductor type on the physical layer repeater or else no mag...

Page 76: ...C 6 Appendix C Checklist ...

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