參數(shù)資料
型號(hào)： TJA1050
廠商： NXP Semiconductors N.V.
英文描述： CAN High-Speed Transceiver(CAN高速收發(fā)器)
中文描述： CAN高速收發(fā)器（的CAN高速收發(fā)器）
文件頁(yè)數(shù)： 21/31頁(yè)
文件大?。?/td> 254K
代理商： TJA1050
TJA1050 - CAN High-Speed Transceiver
Application Note
AN00020
Philips Semiconductors
21
70219'4'&64#05%'+8'4
Today, automotive applications can be divided into systems, which are active only when ignition is on,
and applications, which also have to work even when ignition is off, e.g. when the car is parked. This
imposes a kind of partial networking realized by power supply either via clamp-15 (ignition) or clamp-30
(battery). Nodes at clamp-15 are unpowered when ignition is off, while nodes at clamp-30 are
permanently supplied. A typical power supply configuration is shown in Figure 7.1.
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Figure 7.1 Typical power supply configuration
The above mentioned partial networking concept requires that unpowered clamp-15 transceivers must not
degrade the system performance. Reverse currents flowing from the bus into unpowered transceivers have
to be as low as possible. The TJA1050 is optimised with respect to low reverse currents and thus is
predestined for clamp-15 nodes.
Transceivers have to deal with following issues when unpowered:
-
Asymmetrical Biasing of the Common Mode Signal
-
RXD Dominant Clamping
-
Backward Supply towards V
CC
These issues will be discussed in the following chapters.
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In principle, a circuit like in Figure 7.2 provides symmetrical biasing of the common mode voltage with
respect to the bus voltage levels in dominant state. Thus, in recessive state the bus voltages are biased to the
symmetry voltage of V
CC
/2.
In unpowered situation this internal biasing circuit is the reason for significant reverse currents flowing
from each bus line into the transceiver. As a result the DC voltage level in recessive state and hence the
common mode voltage falls below the symmetry voltage of V
/2. The TJA1050 has been designed to
draw almost no current from the bus in unpowered case. Compared to the PCA82C250 reverse currents
could be reduced by a factor of about 10.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TJA1050T 制造商:NXP Semiconductors 功能描述: 制造商:NXP Semiconductors 功能描述:LAN Transceiver, Single, 8 Pin, Plastic, SOP
TJA1050T/CM,118 功能描述:CAN 接口集成電路 RoHS:否 制造商:Texas Instruments 類型:Transceivers 工作電源電壓:5 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:SOIC-8 封裝:Tube
TJA1050T/H/V,112 功能描述:網(wǎng)絡(luò)控制器與處理器 IC CAN 1MBd Silent 5V 8-Pin 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
TJA1050T/H/V,118 功能描述:網(wǎng)絡(luò)控制器與處理器 IC CAN 1MBd Silent 5V 8-Pin 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
TJA1050T/N,112 功能描述:網(wǎng)絡(luò)控制器與處理器 IC HIGH SPEED CAN 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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