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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： | 7/16頁 |
| 文件大?。?/td> | 75K |
| 代理商： | TJA1054 |
Philips Semiconductors
APPLICATION HINTS
Systems Laboratory Hamburg, Germany
Fault-tolerant CAN transceiver
V2.0
Page 7 of 16
3.3. Average Supply Current at Absence of Bus Short-Circuit Conditions
In recessive state the Transceivers are consuming a Vcc supply current as listed in the corresponding
data sheets. In dominant state the Vcc supply current is calculated by the addition of the IC-internal
supply current (Data sheet, no load condition) and the output current at pins CANH and RTL.
3.3.1. Maximum dominant supply current (without bus wiring faults)
I
cc_dom
= I
cc0_dom
+ I
CANH_dom
+ I
RTL_dom
(1)
I
RTL_dom
= (Vcc - V
CANL_dom
) / R
T
(2)
3.3.2. Example calculation
Maximum dominant supply current without bus wiring faults:
Item from Data Sheet / Assumptions
Max. Vcc supply current dominant, no load
CANH dominant current
Assumed termination resistor
Assumed CANL dominant voltage
Symbol
I
cc0_dom
I
CANH_dom
R
T
V
CANL_dom
PCA82C252
35 mA
40 mA
1 k
1 V
TJA1053
35 mA
40 mA
1 k
1 V
TJA1054
27 mA
40 mA
1 k
1 V
PCA82C252
:
I
cc_dom 252
= 35mA + 40 mA + (5V - 1V) / 1k = 79 mA max.
(Ex 1.1)
TJA1053
:
I
cc_dom 1053
= 35mA + 40 mA + (5V - 1V) / 1k = 79 mA max.
(Ex 1.2)
TJA1054
:
I
cc_dom 1054
= 27mA + 40 mA + (5V - 1V) / 1k = 71 mA max.
(Ex 1.3)
3.3.3. Thermal considerations (without bus wiring faults)
For thermal considerations the average supply current at pin Vcc is relevant considering the transmit
duty cycle. In the following example a continuously transmitting node is assumed. This might happen
e.g. if a node starts a transmission while the rest of the network does not respond with an
acknowledge for some reason. Typically a much lower duty cycle is relevant since a node transmits
messages within certain time slots only, depending on the applications network management.
With an assumed transmit duty cycle of 50% on pin TxD, the maximum average supply current is
I
cc_norm_avg
= 0.5 * (I
cc_rec
+ I
cc_dom
)
(3)
3.3.4. Example calculation
Thermal considerations without bus wiring faults:
Item
Symbol
PCA82C252
TJA1053
TJA1054
Vcc supply current recessive, max.
I
cc_rec
10 mA
10 mA
11 mA
PCA82C252
:
I
cc_norm_avg 252
= 0.5 * (10mA + 79mA) =
44.5 mA max.
(Ex 3.1)
TJA1053
:
I
cc_norm_avg 1053
= 0.5 * (10mA + 79mA) =
44.5 mA max.
(Ex 3.2)
TJA1054
:
I
cc_norm_avg 1054
= 0.5 * (11mA + 71mA) =
41 mA max
.
(Ex 3.3)
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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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