TJA1145T/FDJ

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1. Describe

TJA1145 is a high-speed CAN transceiver that provides an interface between the Controller Area Network (CAN) protocol controller and the physical two-wire CAN bus. This transceiver is specifically designed for high-speed CAN applications in the automotive industry. Provides differential transmit and receive functions for (with) CAN microcontrollers Protocol controller. TJA1145 has extremely low power consumption and Supports CAN partial networks in accordance with ISO 11898-2:2016 in a selective way Wake-up function. Dedicated implementations of some networking functions have been embedded in TJA1145/FD variants TJA1145T/FD and TJA1145TK/FD. This function is called "FD-passive", CAN can be ignored FD frame while waiting for a valid wake-up frame in sleep/standby mode. This extra The characteristics of some networks are very suitable for supporting CAN FD and Standard CAN 2.0 communication. It allows ordinary CAN controllers that are not needed Communicate CAN FD messages to maintain partial network sleep/standby mode No bus error will be generated during CAN FD communication. Advanced power management can adjust the power of the entire node and support Local and remote wake-up function. I/O level will be adjusted automatically according to I/O Controller level, allowing TJA1145 to directly interface with 3.3 V to 5 V Microcontroller. Provides an SPI interface for transceiver control and retrieval status information. When the power is turned off, the bus connection is indeed floating. TJA1145 implements the CAN physical layer and CAN physical layer defined in ISO 11898-2:2016 SAE J2284-1 to SAE J2284-4. This implementation can achieve reliable communication CAN FD fast phase, data rate up to 2 Mbit/s. These features make TJA1145 an ideal choice for high-speed CAN networks Contains nodes that are always connected to battery-powered lines, but in order to Minimum current consumption, only active when required by the application.

2. Features and benefits

    1. 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

    2. Designed for automotive applications

        - ±8 kV ElectroStatic Discharge (ESD) protection, according to the Human Body Model (HBM) on the CAN bus pins

        - ±6 kV ESD protection, according to IEC 61000-4-2 on pins BAT and WAKE and on the CAN bus pins

        - CAN bus pins short-circuit proof to ±58 V

        - Battery and CAN bus pins protected against transients according to ISO 7637-3, test pulses 1, 2a, 3a and 3b.

        - Suitable for use in 12 V and 24 V systems

        - Available in SO14 and leadless HVSON14 package (3 mm × 4.5 mm) with improved Automated Optical Inspection (AOI) capability

        - AEC-Q100 qualified

        - Dark green product (halogen free and Restriction of Hazardous Substances (RoHS) compliant)

    3. Advanced ECU power management system

        - Very low-current Standby and Sleep modes, with full wake-up capability

        - Entire node can be powered down via the inhibit output

        - Remote wake-up capability via standard CAN wake-up pattern or via ISO 11898-2:2016 compliant selective wake-up frame detection

        - Local wake-up via the WAKE pin

        - Wake-up source recognition

        - Bit rates of 50 kbit/s, 100 kbit/s, 125 kbit/s, 250 kbit/s, 500 kbit/s and 1 Mbit/s supported during selective wake-up'

        - Local and/or remote wake-up can be disabled to reduce current consumption

        - Transceiver disengages from the bus when the battery supply is removed

        - VIO input allows for direct interfacing with 3.3 V to 5 V microcontrollers

    4. Protection and diagnosis

        - 16-, 24- or 32-bit SPI for configuration, control and diagnosis

        - Transmit Data (TXD) dominant time-out function with diagnosis

        - Overtemperature warning and shut-down

        - Undervoltage detection and recovery on pins VCC, VIO and BAT

        - Cold start diagnosis (via bits PO and NMS)

        - Advanced system and transceiver interrupt handling

3. Pin configuration

4. Pin description

5. Function Description

    1. System Controller

        The system controller manages the register configuration and controls the internal functions of the TJA1145. Detailed device status information is collected and provided to the microcontroller.

    2. Operation Mode

        The system controller includes a state machine that supports five operating modes: normal, standby, sleep, overheating, and shutdown.

    3. Normal mode

        The normal mode is the active operation mode. In this mode, TJA1145 is fully operational. All device hardware is available and can be activated. The normal mode can be selected from standby or sleep mode by SPI command.

    4. Standby mode

        The standby mode is the first-level power saving mode of TJA1145, with low current consumption. The transceiver cannot send or receive data in standby mode, but the INH pin remains active, so the voltage regulator controlled by this pin will be active. If remote CAN wakeup is enabled, the receiver will monitor bus activity for wakeup requests. When the bus is inactive, the bus pins are biased to GND (via Ri(cm)), when there is activity on the bus (autonomous bias). CAN wake-up can occur through standard wake-up mode or through selective wake-up frame (selective wake-up is enabled when CPNC = PNCOK = 1; otherwise Standard wakeup is enabled). When any enabled wake-up or interrupt event is detected, pin RXD is forced to low level.