TJA1021 LIN Bus UART Module

Product detailed description

The module with the TJA1021 circuit serves as an interface between the LIN (Local Interconnect Network) bus and a microcontroller with a UART interface. It allows for simple connection to an automotive LIN bus and signal conversion between LIN levels and TTL logic (RX/TX). Thanks to screw terminals, it is suitable for development, testing, and integration into industrial and automotive applications.

Specifications:

• Communication circuit: TJA1021 (NXP, automotive LIN transceiver)
• Communication protocol: LIN (ISO 17987 compliant)
• Interface to MCU: UART (TTL level)
• LIN part power supply: 12V DC
• UART logic: 5V
• Max. tested speed: 57600 bps
• Recommended LIN speed: < 20 kbps
• Indication: LED – power
• Design: PCB module with screw terminals
• Protections: integrated LIN bus protections (short circuit, overvoltage, thermal protection)

Pinout:

• LIN part (12V):
• 12V: positive pole of LIN part power supply (VBAT)
• INH: inhibit output (control of external regulator, active in master mode)
• LIN: connection to LIN bus
• GND: ground of LIN part power supply
• UART part (TTL):
• TX: TTL input from MCU to LIN (TXD)
• RX: TTL output from LIN to MCU (RXD)
• SLP: sleep mode control (SLP_N)
• 5V: logic power supply VCC (if available on the module version)
• GND: logic ground – must be connected to MCU ground (common GND)

Package contents:

• 1× TJA1021 LIN Bus UART module

Note:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustration purposes only and may sometimes differ from the actual appearance of the item. However, this does not change its basic properties.