Micro Digital Satellite Receiver Manual do Utilizador descarregar pdf (Página 1)

ncorporates SuperFlash technology licensed from SST.

AN2677/D

3/2004

Digital Satellite Equipment

Control (DiSEqC ) using

MC68HC908QT/QY

Application Note

By Stanislav Arendarik

Motorola Czech System Application Laboratory

Roznov pod Radhostem, Czech Republic

Introduction

This document describes using the Motorola MC68HC908QT/QY series

microcontroller unit (MCU) as the DiSEqC (digital satellite equipment control)

slave. The in this application note is a twin satellite/LNB switch, but it could

easily be adapted to other applications, such as a dual LNB (twin LNB

integrated within same horn), or a four satellite/LBN switch (or quad LNB). With

appropriate hardware and software enhancements, many other features can

be implemented.

The DiSEqC system is divided to two main groups: level 1.x and level 2.x.

• Level 1.x — One-way communication between integrated receiver

decoder (IRD) and satellite outdoor unit (ODU).

• Level 2.x — Two-way communication that supports a return-signalling

path and multiple peripheral devices.

The DiSEqC system uses the existing coaxial cable as the communication bus

that connects satellite receivers and satellite peripheral equipment. DiSEqC

control is a standard solution that replaces other analog control systems and

wiring.

According to the DiSEqC bus specification, the advantages of DiSEqC are:

• Standardized digital system with non-proprietary commands

• Enables switching in multi-satellite installations

• Backwards compatible with 13/18 volt and 22-kHz tone switching

• Potential for reduced power dissipation and thus cost reduction and

improved reliability

• No switching problems caused by incompatibility of system components

• Simplified receiver installation using device recognition via optional

two-way communication

DiSEqC is a trademark of Eutelsat.

Freescale Semiconductor, I

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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Freescale Semiconductor, I 1

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ncorporates SuperFlash technology licensed from SST.© Motorola, Inc., 2004AN2677/D3/2004Digital Satellite Equipment Control (DiSEqC ) using MC68HC908

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AN2677/D10 Digital Satellite Equipment Control (DiSEqC ) using MC68HC908QT/QYSoftware OperationFigure 6. Software OperationSTARTBASIC INITIALIZATIONEN

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AN2677/DConclusionDigital Satellite Equipment Control (DiSEqC ) using MC68HC908QT/QY 11ConclusionThis application note explains the DiSEqC-control of

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AN2677/D Freescale Semiconductor, I Freescale Semiconductor, Inc.For More Information On This Produ

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AN2677/D2 Digital Satellite Equipment Control (DiSEqC ) using MC68HC908QT/QYDiSEqC IntroductionThe DiSEqC standard is a single master, single or multi

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AN2677/DDiSEqC IntroductionDigital Satellite Equipment Control (DiSEqC ) using MC68HC908QT/QY 3Application CharacteristicsThis application using the M

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AN2677/D4 Digital Satellite Equipment Control (DiSEqC ) using MC68HC908QT/QYFigure 1 shows the signal block diagram. There are two universal LNBs used

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AN2677/DDiSEqC IntroductionDigital Satellite Equipment Control (DiSEqC ) using MC68HC908QT/QY 5Figure 2. Functional Block DiagramThe MC68HC908QT4 MCU

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AN2677/D6 Digital Satellite Equipment Control (DiSEqC ) using MC68HC908QT/QYThe DSU in VFC mode is sensitive to tone burst signaling. This control sig

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AN2677/DDiSEqC IntroductionDigital Satellite Equipment Control (DiSEqC ) using MC68HC908QT/QY 7The high-frequency circuit comprises D1, D2, and C3 (D6

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MOTOROLA Digital Satellite Equipment Control (DiSEqC ) using MC68HC908QT/QYAN2677/DDiSEqC IntroductionFigure 3. DiSEqC Slave SchematicRTAC TC105 001

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AN2677/DDiSEqC IntroductionDigital Satellite Equipment Control (DiSEqC ) using MC68HC908QT/QY 9Figure 4. DiSEqC Slave PCBFigure 5. DiSEqC Slave Unit —