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參數資料
| 型號： | TJA1054 |
| 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： | 15/16頁 |
| 文件大小： | 75K |
| 代理商： | TJA1054 |
Philips Semiconductors
APPLICATION HINTS
Systems Laboratory Hamburg, Germany
Fault-tolerant CAN transceiver
V2.0
Page 15 of 16
4.3. Output Current and Power Dissipation of Bus Termination Resistors R
T
References for the below technical information are:
- Data sheet PCA82C252, revision Oct. 28, 1997
- Data sheet TJA1053,
- Data sheet TJA1054,
revision Oct. 15, 1997
revision Feb. 11, 1999
4.3.1. Summary
The bus termination resistors R
T
being connected to the fault tolerant transceivers are recommended
to withstand the following power dissipations (@ R
T
> 1000 Ohms):
PCA82C252 :
64 mW
TJA1053 :
TJA1054 :
64 mW
23,7 mW
The following chapters are discussing this issue in more detail.
4.3.2. Average power dissipation, no bus failures
In order to dimension the power dissipation of the termination resistors the average power dissipation
between dominant and recessive bits has to be taken into account. Additionally a worst case ground
offset of the certain module has an impact.
CAN frames are assumed to have a ratio of dominant bits in the range of 0.75 worst case because of
stuffing and fixed recessive frame segments. Thus the average power dissipation is calculated as
follows:
P
avg
= (0.75 * (V
cc +
V
GND
))
2
/ R
T
(11)
4.3.3. Example calculation, average power dissipation
Assumption : R
T
= 1000 Ohms
P
avg
= (0.75 * (5V
+
1,5V))
2
/ 1000 Ohms =
23.7 mW
(Ex 11.1)
4.3.4. Maximum continuous power dissipation
Because the PCA82C252 and the TJA1053 do not provide a failure detector for CANH short circuits to
Vcc the maximum continuous current flows in case CANH has a short circuit to 8V. This is the
maximum detection threshold for CANH to Battery short circuit conditions.
For the TJA1054 this threshold is 1.85V since shorts to Vcc are detected by this transceiver.
P
cont
= (V
det
max
)
2
/ R
T
(12)
4.3.5.
Example calculation, maximum continuous power dissipation
Assumption :
R
T
= 1000 Ohms
PCA82C252
:
P
cont
= (8 V)
2
/ 1000 Ohms =
64 mW
P
cont
= (8 V)
2
/ 1000 Ohms =
64 mW
P
cont
= (1.85 V)
2
/ 1000 Ohms =
3.4 mW
(Ex 12.1)
TJA1053
:
(Ex 12.2)
TJA1054
:
(Ex 12.3)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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:網絡控制器與處理器 IC HI SPD CAN TRANSCVR RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| TJA1054AT,518 | 功能描述:網絡控制器與處理器 IC CAN XCVR FAULT-TOL RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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