TJA1080（A ）在FlexRay網絡中為協議控制器和物理總線間提供先進接口，可配置成星形或節點形收發器，為FlexRay控制器提供各種發送速度和差異化接收功能，廣泛應用在汽車中各種高速控制應用如動力系統，剎車系統和駕駛系統，車內完整的通信系統架構以及駕駛輔助系統等。本文介紹了TJA1080（A ）主要性能優勢，方框圖以及典型上網星形節點配置圖。
Building on the success of our TJA1080 – the world’s first silicon solution for the FlexRay electrical physical layer – NXP Semiconductors has enhanced its performance to create the TJA1080A. Helping drive new advanced communications system into today’s and tomorrow’s cars, both devices offer extensive feature sets, excellent EMC performance and the unique possibility to create active star couplers.
Aimed primarily at communication systems from 1 Mbit/s to 10 Mbit/s, the FlexRay transceiver TJA1080(A) provides an advanced interface between the protocol controller and the physical bus in a FlexRay network. It can be configured as an active star or node transceiver and provides differential transmit capability to the network and differential receive capability to the FlexRay controller.
Robust communications are secured by actively monitoring system performance using dedicated error and status information (readable by any microcontroller). The device
also monitors internal voltage and temperature and supports the mode control used in NXP’s TJA1054 and TJA1041 CAN transceivers. A Bus Guardian interface enables the TJA1080(A) to be used in systems that require additional supervisions.
The transceiver’s excellent EMC performance is complemented by high ESD protection. While in active star and node configurations, features such as sleep and standby power modes serve the need for automotive power management.
主要優勢：
Allows full and simplified early development of complete FlexRay networks
-configurable as node or star transceiver
}Supports wide range of microcontrollers
- maximum flexibility and lower cost of nodes
}More reliable networks in star configuration due to fault containment by isolating parts of the network
}Delivers robust communications due to extensive error diagnosis and protection mechanisms
}TJA1080(A) – fully pin compatible with no software adaptations necessary
}Data transfer from 1 Mbit/s up to 10 Mbits/s
}Excellent EMC performance
-very low ElectroMagnetic Emission to support unshielded cable
-differential receiver with high common-mode range for excellent ElectroMagnetic Immunity
}Can be used for linear passive bus topologies as well as active star topologies
}Optimized for time-triggered communications systems
}Low power management
主要應用：
}Advanced high-speed control applications
-power train, suspension, steering, braking, etc.
}Backbone of complete in-car communications architecture
}Driver assistance systems
}Safety relevant applications (e.g. brake-by-wire, steerby-wire, etc.)
TJA1080A 增強性能：
A number of performance improvements have been realized with the TJA1080A, including:
}Power-on reset behavior improved
}Fully conforms to E-PL v2.1 Rev A
-proper behavior of ERRN pin and RXD pin
}Upgraded transmitter circuit
-less emission on bus lines
}Enhanced receiver circuit
-higher RF immunity
-supports 70 ns minimum bit time
}Improved test coverage
-guaranteed ultra low leakage current on bus pins, when un-powered
}Improved bus error detection functionality
}Wake-up via FlexRay frames possible
圖1.TJA1080A 方框圖
圖2.典型的TJA1080A 星形節點配置圖