DSP56F80xx Power Line Modem Applications Overview power line mode

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DSP56F80xx Power Line Modem Applications Overview power line mode

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Building Control
DSP56F80xx Power Line Modem Applications
Overview power line modem, increasingly used communication between several appliances integral component smart kitchen, once required both microcontroller general control specialized application-specific integrated circuit (ASIC) coding/decoding sending/receiving functions. Today, both microcontroller ASIC power line modem replaced digital signal processor (DSP). Benefits Interfaces voltage high voltage power grid Transmits data using existing power transmission line Supports networking independent addressing devices Supports stand-alone operation small applications
Controller
POWER LINE MODEM BLOCK DIAGRAM
Power Line
Requires small power stage signal delivery Out-of-the-box software components designed expedite time-to-market reduce development costs
Coding/ Decoding Power Stage
Data
Freescale Ordering Information
Part Number DSP56F801 Product Highlights MHz, MIPS, SCI, SPI, ADC, PWM, Quad Timer Program Flash Program Data Flash Data MHz, MIPS, SCI, SPI, ADC, PWM, Quad Timer Program Flash Program Data Flash Data MHz, MIPS, CAN, SCI, SPI, ADC, PWMs, Quadrature Decoder, Quad Timer 31.5K Program Flash 512K Program Data Flash Data MHz, MIPS, CAN, SCIs, SPI, ADC, PWMs, Quadrature Decoder, Quad Timer 31.5K Program Flash 512K Program Data Flash Data MHz, MIPS, CAN, SCIs, SPI, ADCs, PWMs, Quadrature Decoder, Quad Timer Program Flash Program Data Flash Data MHz, MIPS, SCI, SPI, SSI, TOD, ADC, Quad Timer Program Flash Program Data Flash Data Additional Information MCU-friendly instruction set, OnCE debug, on-chip relaxation oscillator, BootFLASH GPIO available 48-pin LQFP. MCU-friendly instruction set, OnCE debug, on-chip relaxation oscillator, BootFLASH GPIO available 32-pin LQFP. MCU-friendly instruction set, OnCE debug, on-chip relaxation oscillator, BootFLASH, external memory expansion, GPIO available 100-pin LQFP. MCU-friendly instruction set, OnCE debug, on-chip relaxation oscillator, BootFLASH, external memory expansion, GPIO available 144-pin LQFP. MCU-friendly instruction set, OnCE debug, on-chip relaxation oscillator, BootFLASH, external memory expansion, GPIO available both 160-pin LQFP MAPBGA. MCU-friendly instruction set, OnCE debug, external memory expansion, GPIO available 128-pin LQFP.
DSP56F802
DSP56F803
DSP56F805
DSP56F807
DSP56F827
Design Challenges power line modem transmits receives data through power line, mains. home applications requires duplex-mode power line modem that transmits receives data approximately kbit/s. figure page shows simple block diagram power line modem. incoming signal coupled receiving component modem that decodes data delivers application through interface. application returns data modem, where it's coded. transmitter then generates amplified signal that coupled into power line. Factors consider power line communications are: Easy signal coupling into power line. Efficient transmission through power line ongoing separation between communication signal power line frequency.
Resistance noise interference such electromagnetic interference (EMI) electromagnetic compatibility (EMC). regulations power line communication America, Europe, Asia differ greatly. common standard does exist. Europe, example, several frequency bands frequencies ranging from 148.5 have been defined power line communications. frequency range 148.5 open home interconnectivity applications, with modulation frequency band, kHz, defined carrier sense multiple access (CSMA). modulation band selected power line communications must meet required data rate while maximizing resistance noise interference with signal. power line, there several sources noise
interference, each with individual characteristics: Multiples main frequency; i.e., High-voltage transients from flashes switches High-frequency noise power factor corrections (PFCs), motors, inverters Every modulation band advantages disadvantages. Commonly used schemes modulation include binary phase shift keying (BSK), frequency shift keying (FSK), several spread spectrum techniques. applications, modulation scheme should support networking independent addressing devices. physical interface should provide coupling signal from transmitter power line from power line receiver.
SG2069-2
Freescale Semiconductor Solution coupling transformer with high pass characteristic reliable solution, providing necessary galvanic isolation power line from main voltage. one-phase operation, transformer
should connected parallel between phase neutral between three phases three-phase operation. serial connection coupling transformer recommended, because results
high current through transformer that causes magnetic saturation transformer core. figure below shows basic schematic often used coupler.
BASIC SCHEMATIC DATA COUPLER POWER LINE MODEM
Input
Output
above figure, values ratio transformer depend actual data rate power frequency signal. frequencies ranging from 148.5 kHz, coupled signal voltage reach dBµV, equaling Freescale Semiconductor's DSP56F8xx offers superior solution power line modem. DSP56F8xx's small form factor, internal clock generator, microcontroller functions make this device ideal stand-alone operation small applications. 12-bit analog-to-
digital converter (ADC) sufficient resolution detect information signals, 15-bit pulse width modulation (PWM) generates clear transmissions. on-chip flash memory calculating power code decode data transmitted application integrated serial communications interface (SCI). Only small power stage required deliver signal coupling transformer. shown figure page power line modem added existing application using DSP56F8xx. combination interaction
between algorithms used power line modem motor drive gate opener mean influence motor power stage power line communication avoided. special reference design demonstrate benefits including DSP56F8xx power line modem. After successfully proving functionality reference design, software power line communication integrated into embedded Software Development (SDK).
SG2069-3
POWER LINE MODEM ADD-ON GATE OPENER
Power Line
DSP56F803
Core/Memory Power Stage Gate Opener
Development Tools
Tool Type Software Product Name MSW3SDK000AA Vendor Freescale Semiconductor Description Software infrastructure that allows development efficient, high level software applications that fully portable reusable across DSP56800/DSP56800E family processors. CodeWarriorSoftware Development Tools DSP56800 (Metrowerks) Evaluation Modules 56F801 56F802 Evaluation Module 56F803 Evaluation Module 56F805 Evaluation Module 56F807 Evaluation Module 56F827 Emulation Support 56F8xx Processors (Requires Ethernet Network)
Software Hardware Hardware Hardware Hardware Hardware Development
CWDSP56800 DSP56F801EVM DSP56F803EVM DSP56F805EVM DSP56F807EVM DSP56F827EVM DSPOSRTOS
Freescale Semiconductor Freescale Semiconductor Freescale Semiconductor Freescale Semiconductor Freescale Semiconductor Freescale Semiconductor Freescale Semiconductor
Disclaimer This document include details necessary completely develop this design. provided reference only intended demonstrate variety applications device.
Learn More: Contact Technical Information Center +1-800-521-6247 +1-480-768-2130. more information about Freescale products, please visit www.freescale.com.
Freescaleand Freescale logo trademarks Freescale Semiconductor, Inc. other product service names property their respective owners. Freescale Semiconductor, Inc. 2004. rights reserved. SG2069 12/2004
December2004

DSP56F80xx Power Line Modem Applications Overview power line mode

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