TJA1145T

1. General description

The TJA1145 is a high-speed CAN transceiver that provides an interface between a  Controller Area Network (CAN) protocol controller and the physical two-wire CAN bus.  The transceiver is designed for high-speed CAN applications in the automotive industry,  providing differential transmit and receive capability to (a microcontroller with) a CAN  protocol controller.

The TJA1145 features very low power consumption in Standby and Sleep modes and  supports ISO 11898-2:2016 compliant CAN Partial Networking by means of a selective  wake-up function.

A dedicated implementation of the partial networking function has been embedded into  the TJA1145/FD variants TJA1145T/FD and TJA1145TK/FD (see Section 7.3.2 for further  details on CAN FD). This function is called ‘FD-passive’ and is the ability to ignore CAN  FD frames while waiting for a valid wake-up frame in Sleep/Standby mode. This additional  feature of partial networking is the perfect fit for networks that support both CAN FD and  standard CAN 2.0 communications. It allows normal CAN controllers that do not need to  communicate CAN FD messages to remain in partial networking Sleep/Standby mode  during CAN FD communication without generating bus errors.

Advanced power management regulates the supply throughout the node and supports  local and remote wake-up functionality. I/O levels are automatically adjusted to the I/O  levels of the controller, allowing the TJA1145 to interface directly with 3.3 V to 5 V 

microcontrollers. An SPI interface is provided for transceiver control and for retrieving  status information. Bus connections are truly floating when power is off.

The TJA1145 implements the CAN physical layer as defined in ISO 11898-2:2016 and  SAE J2284-1 to SAE J2284-4. This implementation enables reliable communication in the  CAN FD fast phase at data rates up to 2 Mbit/s.

These features make the TJA1145 the ideal choice for high-speed CAN networks  containing nodes that are always connected to the battery supply line but, in order to  minimize current consumption, are only active when required by the application.

2.Features and benefits

General

 ISO 11898-2:2016 and SAE J2284-1 to SAE J2284-4 compliant

 Timing guaranteed for data rates up to 2 Mbit/s

 Autonomous bus biasing according to ISO 11898-2:2016

 Optimized for in-vehicle high-speed CAN communication

 No ‘false’ wake-ups due to CAN FD in TJA1145/FD variants

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