What is the standard voltage of LIN bus?
2 Answers
LIN bus operates at 12V. The master node is configured with a 1kΩ resistor terminating to 12V power supply, while slave nodes are configured with 30kΩ resistors terminating to 12V power supply. Below are relevant introductions about LIN bus: 1. Definition: LIN bus is a low-cost serial communication network defined for automotive distributed electronic systems, serving as a complement to other automotive multiplex networks like Controller Area Network (CAN). It's suitable for applications that don't require high bandwidth, performance, or fault tolerance. LIN bus is based on SCI (UART) data format, adopting a single-master/multi-slave mode, which is a special case of UART. 2. Objective: LIN aims to provide auxiliary functions for existing automotive networks (e.g. CAN bus), making it a supplementary bus network. In scenarios that don't require CAN bus's bandwidth and multifunctionality - such as communication between smart sensors and braking devices - using LIN bus can significantly reduce costs.
As an automotive electronics enthusiast, I've studied in-vehicle networks extensively. The LIN bus standard voltage is based on the vehicle's 12V DC system. During operation, the voltage varies between 0 and 12V: when dominant, it's close to the supply voltage (approximately 12V) representing logic low; when recessive, it's 0V representing logic high. The actual compatible range is relatively wide, functioning between 8 to 18V, but stable 12V is crucial. LIN is used for small components like lights or seat controls - voltage instability can cause malfunctions; common issues include battery aging or line interference causing fluctuations. It's recommended that vehicle owners regularly check battery health to avoid affecting safe driving.
