ISO 17987-4:2025

This document specifies the 12 V and 24 V electrical physical layers (EPL) of the LIN communications system. The electrical physical layer for LIN is designed for low-cost networks with bit rates up to 20 kbit/s to connect automotive electronic control units (ECUs). The medium that is used is a single wire for each receiver and transmitter with reference to ground. Annex A provides recommendations on the LIN physical layer peripheral interface design of type UART and frame controller for commander and responder nodes. This document includes the definition of electrical characteristics of the transmission itself and also the documentation of basic functionality for bus driver devices. This document also provides the physical layer definitions for nodes with LIN AA capabilities according to one of the procedures C, D and E. All parameters in this document are defined for the ambient temperature range from −40 °C to 125 °C.