Detail of GB/T 42691.8-2023

Introduction of GB/T 42691.8-2023

GB/T 42691.8-2023 Road vehicles - Local Interconnect Network (LIN) - Part 8: Electrical physical layer (EPL) specification: LIN over DC powerline (DC-LIN) 1 Scope This document specifies an additional electrical physical layer (EPL) requirements for the Local Interconnect Network (LIN). It specifies the transmission over DC powerline without affecting the LIN higher layers, hereafter named DC-LIN. The DC-LIN EPL uses a high-frequency modulated carrier to propagate UART bytes (byte-oriented) over the DC powerline. The DC-LIN EPL supports bit rates of 9615 bit/s, 10417 bit/s, and 19230 bit/s. This document is applicable for a wide range of DC powerlines including 12-V and 24-V operations, allowing communicating between different DC powerlines via a coupling capacitor. A DC-LIN EPL interface to powerline example is described in Annex A. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 42691.4-2023 Road vehicles - Local Interconnect Network (LIN) - Part 4: Electrical physical layer (EPL) specification 12 V/24 V (ISO 17987-4:2016, IDT) ISO 17987-6 Road vehicles - Local Interconnect Network (LIN) - Part 6: Protocol conformance test specification Note: GB/T 42691.6-2023, Road vehicles - Local Interconnect Network (LIN) - Part 6: Protocol conformance test specification (ISO 17987-6:2016, IDT) IEC 61000-4-2 Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement techniques - Electrostatic discharge immunity test Note: GB/T 17626.2-2018, Electromagnetic compatibility - Testing and measurement techniques - Electrostatic discharge immunity test (IEC 61000-4-2:2008, IDT) 3 Terms, definitions, symbols, and abbreviated terms 3.1 Terms and definitions 3.1.1 BR_9_6K DC-LIN EPL operating at nominal bit rate of 9615 bit/s 3.1.2 BR_10K DC-LIN EPL operating at nominal bit rate of 10417 bit/s 3.1.3 BR_19_2K DC-LIN EPL operating at nominal bit rate of 19230 bit/s 3.1.4 byte field byte that consists of one start bit, eight data bits, and one stop bit 3.1.5 byte field sync preamble sequence of phase shifts at the beginning of EPL byte field modulation used for byte synchronization 3.1.6 carrier frequency DC-LIN EPL center frequency that is altered (modulated) to transfer data 3.1.7 coupling capacitor capacitor for blocking the DC powerline voltage to/from a DC-LIN EPL 3.1.8 DC-LIN EPL RX mode mode that DC-LIN EPL de-asserts line-out and controls RXD according to signal at line-in 3.1.9 DC-LIN EPL TX mode mode that DC-LIN EPL controls line-out according to logic state present at TXD 3.1.10 start bit logic low (‘0’) of the first bit of a byte field 3.1.11 stop bit logic high (‘1’) of the last bit of a byte field 3.2 Symbols and abbreviated terms '0': logical 0 '1': logical 1 Bdata_bit: byte field data bit signalled on RXD at DC-LIN EPL receiver side Bdata_bit_local: byte field data bit signalled on RXD at DC-LIN EPL transmitter side Bdel: break delimiter signalled on RXD at DC-LIN EPL receiver side Bdel_local: break delimiter signalled on RXD at DC-LIN EPL transmitter side Berr_data_bit_local: byte field error data bit signalled on RXD at DC-LIN EPL transmitter side Bfe_stop_bit: byte field frame error stop bit signalled on RXD at DC-LIN EPL receiver side Bfe_stop_bit_local: byte field frame error stop bit signalled on RXD at DC-LIN EPL transmitter side Bfe_del_local: break field delimiter frame error signalled on RXD at DC-LIN EPL transmitter side Bfe_start_bit_local: byte field frame error start bit signalled on RXD at DC-LIN EPL transmitter side BR DC-LIN EPL operating bit rate Bstart_bit: byte field start bit signalled on RXD at DC-LIN EPL receiver side Bstart_bit_local: byte field start bit signalled on RXD at DC-LIN EPL transmitter side Bstop_bit: byte field stop bit signalled on RXD at DC-LIN EPL receiver side Bstop_bit_local: byte field stop bit signalled on RXD at DC-LIN EPL transmitter side CBTX: consecutive byte field transmission CFmax: maximal number of carrier frequencies implemented in IUT transmit signal fci: carrier frequency FBTX: first byte field transmission I: in-phase signal component bit/s: bit per second line-in: modulated carrier signal input pin to the EPL from the DC powerline line-out: modulated carrier signal output pin from the EPL to the DC powerline Lout_lev: line-out sampled monitoring level Lout_thr_lev: line-out monitoring peak threshold level Lout_err_cond: line-out monitoring error condition max.: maximum min.: minimum Pbyte_length: nominal length of modulated byte field in tBIT Pdata_bit_len: nominal length of modulated byte field data bit Pdata: data bit modulation phases Pdh_1: data bit ‘1’ 1 st phase shift Pdh_2: data bit ‘1’ 2 nd phase shift Pdh_3: data bit ‘1’ 3 rd phase shift Pdl_1: data bit ‘0’ 1 st phase shift Pdl_2: data bit ‘0’ 2 nd phase shift Pdl_3: data bit ‘0’ 3 rd phase shift Pref_consec: reference phase of consecutive byte transmission Pref_first: reference phase of the first byte transmission Psync_p: sync preamble modulation phases Psp_1: sync preamble 1 st phase shift Psp_2: sync preamble 2 nd phase shift Psp_3: sync preamble 3 rd phase shift Psp_4: sync preamble 4 th phase shift Psp_5: sync preamble 5 th phase shift Psp_6: sync preamble 6 th phase shift Psp_7: sync preamble 7 th phase shift Psp_8: sync preamble 8 th phase shift Psp_9: sync preamble 9 th phase shift Psp_10: sync preamble 10 th phase shift Psp_11: sync preamble 11 th phase shift Psp_12: sync preamble 12 th phase shift Psp_13: sync preamble 13 th phase shift Psp_14: sync preamble 14 th phase shift Psp_15: sync preamble 15 th phase shift Psp_16: sync preamble 16 th phase shift

Contents of GB/T 42691.8-2023