TJA1028TK/5V0/20:1 Integrated Circuits (ICs)

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The TJA1028TK/5V0/20:1 is a transceiver in the CANphysical layer for automotive applications that complies to ISO11898-2. It is a single-channel integrated transceiver optimized for high-speed CAN applications with data-rates up to 1 Mbit/s.

It features a low-power consumption over the whole temperature range as well as hot swapping capability. The transceiver is equipped with a silent mode, allowing to reduce losses in standby and silent operation modes, while a fast wake-up time prevents bus failures due to delay on bus wake-up.

The transceiver meets the needs of the global market, as it includes short-circuit protection, thermal shut-down on overtemperature and different EMC measures. The device is cost-optimized by using an auto-calibrated integrated voltage regulator for the wire termination and configurable bias current.

Application Field

The TJA1028TK/5V0/20:1 is mainly used in automotive applications such as electric/hybrid vehicles, in-vehicle networks, driver assistance systems, and industrial CAN systems. It also complies to electric power train (EPT) specifications and supports ISO11898-3/ISO11898-6.

The device supports all diagnostic functions according to ISO14229, ISO15031 and SAEJ1939. It also supports in-vehicle diagnosis, e¬burner, flash-programming and calibration. It is designed for easy integration into computer platforms and provides an active high-speed differential bus with a data-rate of up to 1 Mbit/s.

Working Principle

The TJA1028TK/5V0/20:1 uses a single-channel, differential physical interface for communications between nodes connected to the CAN bus. The integrated transceiver consists of a power supply section and a transmitter driver section. It also contains a differential receiver, a differential bus driver, and two differential receivers connected to the CAN low and CAN high lines.

The transceiver has a number of features that make it suitable for applications in the automotive industry. It includes an inner differential receiver, a differential line driver, a winding filter and a differential filter to isolate transmitted and received signals. It also features a power-down mode, which can be activated when the device is not used, allowing it to consume minimal power when the bus is idle. In addition, it supports hot-swapping, allowing plug connections to be changed without stopping the bus data flow.

When the TJA1028TK/5V0/20:1 is in standby mode, the transmitter is disabled, consuming no power. When the standby signal is activated, the transceiver wakes up and can start communication. Before sending data, the receiver validates the identifier to ensure that the transmitted signal has a correct identifier, and that the bus is not in error state. The signal is then transmitted on the bus and the transmitter remains enabled until a dominant signal is received on the bus.

To provide protection against current spikes, the TJA1028TK/5V0/20:1 includes an overload protection circuit, which disconnects the power supply when the voltage exceeds the specified limit. In addition, the device is equipped with a thermal shut-down and short-circuit protection which shuts down the device if temperatures exceed a predetermined threshold, or in case of a short circuit.

Conclusion

The TJA1028TK/5V0/20:1 is an integrated transceiver for automotive applications, and complies to ISO11898-2 requirements. It supports communications between nodes connected to a CAN bus, with data rates up to 1 Mbit/s. The device is designed for easy integration into computer platforms, and features a low-power consumption, hot-swapping capability and protection against current spikes. Its protection functions make it suitable for use in the automotive industry.

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