ISO 17987-4-2016 pdf free.Road vehicles一Local Interconnect Network (LIN])一Part 4: Electrical physical layer (EPL] specification 12 V/24 V.
ISO 17987 (all parts) and ISO 14229-7 are based on the conventions specified in the OSl Service Conventions (see ISO/IEC 10731) as they apply for physical layer, protocol, network and transport protocol and diagnostic services.
5 Electrical physical layer requirements
5.1 Bit rate deviation
The bit rate deviation of the LIN medium describes the bit rate deviation from a referenced bit rate. It is the sum of the following parameters:
— inaccuracy of setting the bit rate (systematic failure due to granularity of the configurable bit rate);
— clock deviation over temperature and supply voltage range;
— clock source stability of the slave node starting from the end of the sync byte field up to the end of the entire LIN frame (last sampled bit) when performing synchronization;
— bit time measurement failure of the slave node;
— clock source stability of the master node starting from the end of the sync byte field up to the end of the entire UN frame (last transmitted bit).
On-chip clock may achieve a frequency deviation of better than ±14 % with internal calibration. This bit rate deviation better than ±14 is sufficient to detect a break field in the message stream. The subsequent bit rate adaptation using the sync byte field ensures the proper reception and transmission of the message. The on-chip oscillator shall allow for accurate bite rate measurement and generation for the remainder of the message frame, taking into account effects of anything, which affects the bit rate, such as temperature and voltage drift during operation.
The bit rates on the LIN bus are specified in the range of 1 kbit/s to 20 kbit/s. The specific bit rate used on a LIN bus is defined as the nominal bit rate, FN01.
In case a non-uN electrical physical layer (e.g. ISO 11898-1, ISO 11898-2) is used, the bit rate may have to be adjusted.
5.1.1 12 V LIN systems: Parameters
Table 1 defines the bit rate deviation from nominal bit rate.ISO 17987-4 pdf free download.
Tags: Road vehicles
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