NXP TJA1041 高速AN 解决方案

NXP 公司的TJA1041是高速CAN收发器，为协议控制器和控制器局域网(CAN)节点间提供了先进的接口，接口标准和ISO 11898兼容，通信速率高达1Mbps，有极好的电磁兼容(EMC)性能和非常低的功耗，广泛用于汽车电子。本文介绍了TJA1041的主要性能，方框图，典型的应用电路图以及用于汽车电子的瞬态特性和时序测试电路图。

TJA1041 High speed CAN transceiver
The TJA1041 provides an advanced interface between the protocol controller and the
physical bus in a Controller Area Network (CAN) node. The TJA1041 is primarily intended for automotive high-speed CAN applications (up to 1 Mbit/s). The transceiver provides differential transmit capability to the bus and differential receive capability to the CAN controller. The TJA1041 is fully compatible to the ISO 11898 standard, and offers
excellent ElectroMagnetic Compatibility (EMC) performance, very low power
consumption, and passive behavior when supply voltage is off. The advanced features
include:

Low-power management, supporting local and remote wake-up with wake-up source
recognition and the capability to control the power supply in the rest of the node
Several protection and diagnosis functions including short circuits of the bus lines and
first battery connection
Automatic adaptation of the I/O-levels, in line with the supply voltage of the controller

主要特性：
1.Optimized for in-vehicle high speed communication
Fully compatible with the ISO 11898 standard
Communication speed up to 1 Mbit/s
Very low ElectroMagnetic Emission (EME)
Differential receiver with wide common-mode range, offering high ElectroMagnetic
Immunity (EMI)
Passive behavior when supply voltage is off
Automatic I/O-level adaptation to the host controller supply voltage
Recessive bus DC voltage stabilization for further improvement of EME behavior
Listen-only mode for node diagnosis and failure containment
Allows implementation of large networks (more than 110 nodes)
2．Low-power management
Very low-current in Standby and Sleep mode, with local and remote wake-up
Capability to power-down the entire node, still allowing local and remote wake-up
Wake-up source recognition
3．Protection and diagnosis (detection and signalling)
TXD dominant clamping handler with diagnosis
RXD recessive clamping handler with diagnosis
TXD-to-RXD short-circuit handler with diagnosis
Overtemperature protection with diagnosis
Undervoltage detection on pins VCC, VI/O and VBAT
Automotive environment transient protected bus pins and pin VBAT
Short-circuit proof bus pins and pin SPLIT (to battery and to ground)
Bus line short-circuit diagnosis
Bus dominant clamping diagnosis
Cold start diagnosis (first battery connection)



图1. TJA1041方框图



图2. TJA1041和3 V微控制器电型应用电路图



图3. TJA1041用于汽车电子的瞬态特性测试电路图



图4. TJA1041时序特性测试电路图

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