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 11898-6:2013 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. 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 the current ISO11898 standards (ISO11898-2:2003, ISO11898-5:2007 and ISO11898-6:2013) and the pending updated version of ISO 11898-2:2016). Pending the release ISO11898-2:2016 including CAN FD and SAE-J2284-4, additional timing parameters defining loop delay symmetry are included. 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.