Datasheet > QDC10

QDC10

更新时间： 2022-12-17 02:53:08

品牌	Logo	应用领域
YAMAR		电池
页数	文件大小	规格书
9页	310K
描述
Multiplex Data On Battery Power Lines

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QDC10 数据手册

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

Command

TxData

Code

Fxh

Description

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

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

(2-16)

TxWakeData

8xh

Reset

Sleep

01h

02h

Restart the QDC10

QDC10 enter to Sleep mode

For the value of x - see table 3.3

DS-QDC10 R1.5

www.yamar.com

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

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