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參數(shù)資料
| 型號： | TJA1053 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | CAN |
| 英文描述： | Fault-tolerant CAN transceiver(容錯CAN收發(fā)器) |
| 中文描述： | 容錯CAN收發(fā)器（容錯的CAN收發(fā)器） |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 75K |
| 代理商： | TJA1053 |
Philips Semiconductors
APPLICATION HINTS
Systems Laboratory Hamburg, Germany
Fault-tolerant CAN transceiver
V2.0
Page 14 of 16
4.1.2. Example calculation, Variable System Size
The entire example system has 15 nodes in total, 5 nodes of this system are optional ones and only
implemented if required:
Termination of the 10 standard nodes :
Termination of the 5 optional nodes :
1.2 kOhm per node
3 kOhm per node
Total system termination, standard nodes only :
1.2 kOhm / 10 nodes =
120 Ohms
(...close to 100)
Total system termination, 15 nodes :
(3 kOhm / 5 nodes) parallel to 120 Ohms =
100 Ohms
There is no general rule how to distribute the termination within the network. A rule of thumb is :
“The longer the cable stub, the lower the local termination.”
4.2. Tolerances of Bus Termination Resistors, EMC Considerations
The symmetry of the termination resistors within a single node has a major impact to the systems EME
(Electro Magnetic Emission) behaviour. Thus it is important to have well matched termination resistors
within each control unit. This means that the RTH resistor should have exactly the same value
compared to the RTL resistor within one control unit in order to get the same time constant on each
bus wire during signal transitions. The tolerance between two different control units is absolutely
insignificant ( see also 4.1.1. ).
The principle to achieve a good EME performance is that the differential signal on the bus wires
eliminates any emission due to compensation effects if both CAN wires are carrying exactly the same
signal, but with inverse polarities.
Here the transceiver can only provide a perfect symmetry for the dominant transitions by design. The
recessive transitions are mainly driven by the termination resistors and the network cables itself. So
not only the transceiver’s output drivers have an impact to the EME performance but also the
termination and the cable symmetry.
It is recommended to provide a termination resistor accuracy (RTH compared to RTL) within the same
node of 1% or lower. Also the bus cable has to be at least a twisted pair cable in order to achieve a
symmetrical capacitive load for both bus wires resulting in a good EMC performance.
It is obvious that also the layout of printed circuit boards has a significant impact to the EMC behaviour
if the CAN lines have different capacitive loads due to different wire lengths.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TJA1053T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Fault-tolerant CAN transceiver |
| TJA1053T/N,112 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC FAULT TOLERANT TRANSCEIVER RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| TJA1053T/N,118 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC FAULT TOLERANT TRANSCEIVER RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| TJA1053T/N1,512 | 功能描述:IC CAN TXRX FAULT-TOL 14-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| TJA1053T/N1,518 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC FAULT TOLERANT TRANSCEIVER RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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