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參數(shù)資料
| 型號(hào)： | TJA1054 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | CAN |
| 英文描述： | Fault-tolerant CAN transceiver(容錯(cuò)CAN收發(fā)器) |
| 中文描述： | 容錯(cuò)CAN收發(fā)器（容錯(cuò)的CAN收發(fā)器） |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 75K |
| 代理商： | TJA1054 |
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Philips Semiconductors
APPLICATION HINTS
Systems Laboratory Hamburg, Germany
Fault-tolerant CAN transceiver
V2.0
Page 13 of 16
4. Calculation of Bus Termination Resistors and EMC issues
4.1. How to dimension the Bus Termination Resistor values, some basic rules
The fault tolerant transceivers are designed to deliver optimum system behaviour at a total termination
resistance of 100 Ohms. This means that the CANH line is terminated with 100 Ohms as well as the
CANL line. Because the termination of this fault tolerant system is distributed all over the network,
each of the transceivers has to deliver only a part of the total 100 Ohm termination. So depending on
the overall system size the single nodes local termination resistors have to be calculated.
Termination resistors are connected within each control unit to the corresponding RTH and RTL pins
of the transceivers.
Examples :
5 node system :
500 Ohms termination at each transceiver,
10 node system :
1000 Ohms termination at each transceiver
Fig. 1 : Example Network with 5 nodes, 500 Ohms termination at each node
It is not required that each transceiver in the system has the same termination resistor value. In total
the termination should result in 100 Ohms. It is not recommended to terminate the entire system lower
than 100 Ohms since the CAN output drivers are limited to a load of 100 Ohms.
The minimum termination resistor value allowed per transceiver is 500 Ohms due to the driving
capability of the RTL and RTH pins. So within systems with less than 5 transceivers it is not possible
to achieve the 100 Ohm termination optimum. In practice this is typically no problem because such
“small” systems will have less bus cable lengths compared to bigger networks and thus have no
problem with a higher total termination resistances.
It is recommended not to exceed approximately 6kOhms termination at a single transceiver in order to
provide a good EMI (Electro Magnetic Immunity) performance of the system in case of interrupted bus
wires. Nevertheless up to 16kOhms are specified for the transceivers.
4.1.1. Variable System Size, Optional Nodes
In case of variable system sizes with optional nodes it is recommended to achieve a total termination
resistance close to 100 Ohms provided by the standard nodes which are always present. The optional
nodes should have the higher termination resistances then. Due to EMI issues it is recommended not
to exceed approx. 6kOhms for the optional nodes.
Transceiver
#1
RTH
RTL
CANH
CANL
500
500
Transceiver
#2
RTH
RTL
CANH
CANL
500
500
Transceiver
#3
RTH
RTL
CANH
CANL
500
500
Transceiver
#4
RTH
RTL
CANH
CANL
500
500
Transceiver
#5
RTH
RTL
CANH
CANL
500
500
CANH
CANL
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相關(guān)代理商/技術(shù)參數(shù) |
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| TJA1054_1008 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Fault-tolerant CAN transceiver |
| TJA1054A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Fault-tolerant CAN transceiver |
| TJA1054AT | 制造商:NXP Semiconductors 功能描述:TRANSCEIVER CAN FAULT TOL SO-14 制造商:NXP Semiconductors 功能描述:TRANSCEIVER, CAN FAULT TOL, SO-14 制造商:NXP Semiconductors 功能描述:Fault-tolerant CAN transceiver,TJA1054AT |
| TJA1054AT,512 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC HI SPD CAN TRANSCVR 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 |
| TJA1054AT,518 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC CAN XCVR FAULT-TOL 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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