TJA1027T/20,118

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Transceiver
Protocol:	LINbus
Number of Drivers/Receivers:	1/1
Duplex:	--
Receiver Hysteresis:	175mV
Data Rate:	--
Voltage - Supply:	5 V ~ 18 V
Operating Temperature:	-40°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SO

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TJA1027T/20,118 Application Field and Working Principle

The TJA1027T/20,118 is an automotive bus transceiver located in the dedicated interface of drivers, receivers, and transceivers. This integrated circuit chip works to match the two-wire bus – the Local Interconnect Network (LIN) bus protocol, from 2.4 Kbit/s to 20,118 Kbit/s. By providing a bridge between the low-level hardware and high-level software, this chip is designed to increase the efficiency, endurance, and scalability of automotive networks.

Protocol & Application
The TJA1027T/20,118 is designed to support the LIN bus protocol, which is a low-cost and low-power-capable serial communications protocol. Its main application includes automotive digital buses, where it is used as an interface between the body control module (BCM), electronic control unit (ECU), and other network nodes in automotive applications. This chip can also be used in industrial, office and home applications.

Internal Components
The TJA1027T/20,118 is designed with several internal components to ensure that it functions according to the LIN bus protocol. It contains two modulation signal transducers – a transceiver (TXD) and a receiver (RXD). These transducers are used to convert analog signal input into digital signal output. Additionally, the chip includes a voltage regulator, crystal oscillator, and reference voltage generator. The voltage regulator adjusts the voltage level to the proper value for the chip to function correctly. The reference voltage generator ensures that the signal level remains constant, while the crystal oscillator creates a clock signal that is used by the chip’s internal logic to synchronize data protocol.

Working Principle
When the TJA1027T/20,118 is active, it will wait to receive a signal from the LIN bus. A signal is only triggered when a valid LIN bus id is sent from one of the nodes. Once a signal is detected, the TJA1027T/20,118 will transmit a signal to the corresponding node. The signal will trigger the chip’s internal logic, which will then handle the data transfer. The data is then converted from digital to analog and is sent out through the TXD (transmission) and RXD (reception) pins on the chip. Finally, the data is sent back to the LIN bus for further processing.

Conclusion
The TJA1027T/20,118 is an automotive bus transceiver located in the dedicated interface of drivers, receivers, and transceivers. Structured to support the LIN bus protocol, this chip works to match the two-wire bus, from 2.4 Kbit/s to 20,118 Kbit/s. Its main application includes automotive digital buses, where it is used as an interface between the body control module (BCM), electronic control unit (ECU) and other network nodes in automotive applications. Detailed with several internal components, the chip is designed to increase the efficiency, endurance, and scalability of automotive networks. During operation, it will wait for a signal from the LIN bus, with a signal only triggered when a valid LIN bus id is sent. It will then internal logic will handle the data transfer and will be sent to TXD and RXD pins to be sent back to the LIN bus.

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