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QDC10: Descriptionmultiplex data On battery power lines; File Size305KB，9 Pages; ManufacturerYamar Electronics Ltd.; Websitehttp://yamar.com/

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QDC10 Overview

multiplex data On battery power lines

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YAMAR

E lec tro n ics L td

Preliminary

Data Sheet

QDC10 - Multiplex Data

On Battery Power Lines

January 2002

The information in this data sheet is preliminary and may be changed without notice.

GENERAL

The QDC10 is a VLSI device for Data communication over noisy DC power lines to eliminate complex

wiring and provide quick and simple installation. If required, the device can operate on a single wire bus.

It is a complete solution to multiplex commands and data between wide range of modules in a vehicle

such as Climate Control and its Temperature sensors, Security detectors and Immobilizers, Car Audio

components, Remote operation buttons on the steering wheel, etc.

The QDC10 is based on a patented DC-BUS™ technology. It contains a Modem, Channel

Coder/decoder (ECC), Communication Controller to overcome the hostile environment on vehicle

battery lines.

Applications

Vehicle Electronics

Security Systems

Car Audio Control

Climate Control

Navigation Systems

Features

Noise Robust, 10Kbps Communication on Battery Power Lines

Peer to Peer, Up to 16 Devices, 2-16 bytes Packet Message

Low Cost, Flexible, Eliminates Complex Cabling, Saves

installation

Sleep Mode for Low Power Consumption

Opens New Dimensions for Car Electronics Design

Data Bandwidth can be Shared dynamically Between active

devices

Figure 1.1 - Typical QDC10 Applications

2.1

OVERVIEW

DC-BUS™ System

™

A QDC10 network serves up to 16 devices, each of them can broadcast data messages to other devices

on the bus. The device can be interfaced and controlled by a Host microprocessor via a serial

synchronous communication. Simple applications, such as switches can be implemented directly on the

device eliminating the need of a host. The DC-BUS is a Carrier Sense Multiple Access (CSMA) Collision

detection / resolving system. It uses a dedicated frequency for Data and Control transfer between

DS-QDC10 R1.5

www.yamar.com

Shimon Hatarsi Tel Aviv, Israel. Tel (972) 3 5445294 Fax (972) 3 5445279

QDC10 - Multiplex Data on Battery Power Lines

3.2

Transmit Mode

Transmission procedure is initiated by the host by a TxData or TxWakeData command followed by data

bytes. The device starts the transmission with an arbitration procedure used in order to detect and

resolve collisions on the channel. The arbitration procedure consists of a pattern of time slots, each

dedicated for transmission or for sensing of the DC-BUS. If the device senses a transmission during the

arbitration procedure it aborts the transmission. If the device succeeds to access the channel, the

device continues the transmission of a preamble sequence, followed by the rest of the coded message

and returns a TxAck to its host (which means that the transmission is over). If the device fails in

resolving the channel, it switches to Receive mode and receives a message (or RxError). If the device

does not return TxAck within 40mS, the Host (application) may wait a random period of time (to avoid

collisions) and send the message again to the device.

3.3

Receive Mode

Upon detection of a legal header, a message with a header and up to 16 data bytes will be received into

the device internal buffer. The device indicates the Host that a message is ready by raising the DataOut

signal. The Host has to read that message in 2mS to enable reception of a new message from the bus.

3.4

Sleep Mode

The Host can command the device to enter into sleep mode (e.g. when no signal is received or

transmitted for a time period defined by the application). The device wakes up every 18mS to detect

activity on the bus. A change on the DataIn signal will also wake-up the device. When the bus is

quiescent and the device needs to transmit a message to the bus, the Host has to send a TxWakeData

command. The TxWakeData command has a long preamble, to allow all other devices on the bus to

wake-up during the preamble and before the data is transmitted.

3.5

Controlling the QDC10

3.5.1

Data from Host to QDC10

The QDC10 device is controlled by a set of commands as listed in table 3.1. Data transmission starts

after the Host finishes to transfer the command byte and the data bytes into the QDC10 internal transmit

buffer.

3.5.2

Command Set

Host controls the QDC10 device with the following set of commands:

Table 3.1 - Command Set

Description

Transmit the following 16-x bytes of data (2-16)

Transmit a long header followed by 16-x bytes of data

(2-16)

Reset

01h

Restart the QDC10

Sleep

02h

QDC10 enter to Sleep mode

For the value of

- see table 3.3

Command

TxData

TxWakeData

Code

Fxh

8xh

DS-QDC10 R1.5

www.yamar.com

Shimon Hatarsi Tel Aviv, Israel. Tel (972) 3 5445294 Fax (972) 3 5445279

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