NXP TJA1080A 汽车FlexRay收发方案

NXP公司的TJA1080A是 汽车FlexRay收发器,完全和FlexRay电物理层标准V2.1 Rev. A兼容,部分和V2.1 Rev. B兼容.通信系统的速率从1Mbps 到10Mbps,在FlexRay网络协议控制器和物理总线间提供先进的接口.TJA1080A可配置成星形收发器或节点收发器. TJA1080A 适用于14 V 和 42 V电源系统.具有低功耗电源管理,诊断(检测和信令)以及保护等功能.本文介绍了TJA1080A的主要特性,方框图, 动态特性测试电路和瞬态特性测试电路.

The TJA1080A is a FlexRay transceiver that is fully compliant with the FlexRay electrical
physical layer specification V2.1 Rev. A and partly complies with version V2.1Rev. B. It is primarily intended for communication systems from 1 Mbit/s to 10 Mbit/s, and provides an advanced interface between the protocol controller and the physical bus in a FlexRay network.
The TJA1080A can be configured to be used as an active star transceiver or as a node
transceiver.
The TJA1080A provides differential transmit capability to the network and differential
receive capability to the FlexRay controller. It offers excellent EMC performance as well as high ESD protection.
The TJA1080A actively monitors the system performance using dedicated error and
status information (readable by any microcontroller), as well as internal voltage and
temperature monitoring.
The TJA1080A supports the mode control as used in NXP Semiconductors TJA1054
and TJA1041 CAN transceivers.
The TJA1080A is the next step up from the TJA1080 FlexRay transceiver Being fully pin compatible and offering the same excellent ESD protection, the TJA1080A also features:
TJA1080A主要特性:
Improved power-on reset concept
Improved ElectroMagnetic Emission (EME)
Support of 60 ns minimum bit time
Improved bus error detection functionality
This makes the TJA1080A an excellent choice in any kind of FlexRay node.
Optimized for time triggered communication systems
Compliant with FlexRay electrical physical layer specification V2.1 Rev. A
Automotive product qualification in accordance with AEC-Q100
Data transfer up to 10 Mbit/s
Support of 60 ns minimum bit time
Very low EME to support unshielded cable
Differential receiver with high common-mode range for ElectroMagnetic Immunity
(EMI)
Auto I/O level adaptation to host controller supply voltage VIO
Usable for 14 V and 42 V powered systems
Bus guardian interface included
Independent power supply ramp-up for VBAT, VCC and VIO
Transceiver can be used for linear passive bus topologies as well as active star
topologies
Low power management
Low power management including two inhibit switches
Very low current in Sleep and Standby modes
Local and remote wake-up
Supports remote wake-up via dedicated data frames
Wake-up source recognition
Automatic power-down (in Star-sleep mode) in star configuration
Diagnosis (detection and signalling)
Overtemperature detection
Short-circuit on bus lines
VBAT power-on flag (first battery connection and cold start)
Pin TXEN and pin BGE clamping
Undervoltage detection on pins VBAT, VCC and VIO
Wake source indication
Protections
Bus pins protected against 8 kV HBM ESD pulses
Bus pins protected against transients in automotive environment (ISO 7637 class C
compliant)
Bus pins short-circuit proof to battery voltage (14 V and 42 V) and ground
Fail-safe mode in case of an undervoltage on pins VBAT, VCC or VIO
Passive behavior of bus lines in the event that transceiver is not powered
Functional classes according to FlexRay electrical physical layer specification
Bus driver voltage regulator control
Bus driver - bus guardian control interface
Bus driver logic level adaption
Active star - communication controller interface
Active star - bus guardian interface
Active star voltage regulator control



图1.TJA1080A方框图



图2.TJA1080A 动态特性测试电路



图2.TJA1080A汽车瞬态特性测试电路