Chained two-wire data bus consisting of two single-wire data buses, each with several differential levels for bidirectional transmission of lighting data based on the JTAG protocol

摘要

The invention relates to a light module and the matching a housing (GH) for a bus node (BSn) in the form of an integrated circuit. The light module is intended to be used in a data bus system for transmitting illumination data for light sources (LED1, LED2, LED3) by means of a differential two-wire data bus (b1, b2, b3), wherein the differential two-wire data bus (b1, b2, b3) forms an integral part of the light module concept is. The two-wire data bus (b1, b2, b3) is provided for the transmission of data between a bus master (BM) and between at least two bus nodes (BS1, BS2, BS3). The two-wire data bus (b1, b2, b3) is divided by the bus nodes (BS1, BS2, BS3) into at least two two-wire data bus portions (b1, b2, b3). The bus nodes (BS2, BS3) are provided by a preceding two-wire data bus section (b2, b3) of the two-wire data bus sections (b1, b2, b3) with a preceding bus node (BS1, BS2) of the bus nodes (BS1, BS2, BS3) or the bus master (BM) to be connected. The housing (GH) of the bus node (BSn) has at least two rows of terminals, a first row of terminals (GND, b1a, b1b, Vbat) and a second row of terminals (GND, b2a, b2b, Vbat). At least these at least two rows of terminals on the housing (GH) are arranged opposite one another. Each of the terminal rows comprises a terminal (GND) for the negative supply voltage and preferably a terminal (Vbat) for the positive supply voltage, which are arranged in each terminal row, that they can be connected in pairs according to their function without crossing. The respective two connections (b1a, b1b) for the respective two-wire data bus sections (b1, b2) are arranged between the connections for the supply voltages in each case one terminal row. A light source (LED1, LED2, LED3) is arranged in a recess (ASP) of the housing.