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Cómo estudiar sus tarjetas
Teclas de Derecha/Izquierda: Navegar entre tarjetas.tecla derechatecla izquierda
Teclas Arriba/Abajo: Colvea la carta entre frente y dorso.tecla abajotecla arriba
Tecla H: Muestra pista (3er lado).tecla h
Tecla N: Lea el texto en voz.tecla n
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Meaning of LIN bus?
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Local Interconnect Network (LIN)
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LIN characteristics?
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• Low cost option (if speed/fault tolerance are not critical)
• Often used in vehicles for windows, wipers, air condition etc.. |
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Topology?
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• LIN clusters consist of 1 master and up to 16 slave nodes
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Speed?How is wired? distance covered?
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• Single wire (+ground) with 1-20 kbit/s at max 40 m bus length
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Voltage?
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• Operating voltage of 12V
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Frame format?
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The LIN bus message frame consists of a header and a response
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header?
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Break: The Sync Break Field (SBF) aka Break is minimum 13 (dominant) + 1 (Recessive) bits long. The Break field acts as a “start of frame" notice to all LIN nodes on the bus.
Sync: The 8 bit Sync field has a predefined value of 0x55 (in binary, 01010101). This structure allows the LIN nodes to determine the time between rising/falling edges and thus the baud rate used by the master node. This lets each of them stay in sync. Identifier: The Identifier is 6 bits, followed by 2 parity bits. The ID acts as an identifier for each LIN message sent and which nodes react to the header. Slaves determine the validity of the ID field (based on the parity bits) and act: Ignore the data transmission or Publish data in response to the header |
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response?
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Data: When a LIN slave is polled by the master, it can respond by transmitting 1 to 8 bytes of data. The data length can be customized, but it is typically linked to the ID range (ID 0-31: 2 bytes, 32-47: 4 bytes, 48-63: 8 bytes). The data bytes contain the actual information being communicated in the form of LIN signals. The LIN signals are packed within the data bytes and may be e.g. just 1 bit long or multiple bytes.
Checksum: As in CAN, a checksum field ensures the validity of the LIN frame. The classic 8 bit checksum is based on summing the data bytes only (LIN 1.3), while the enhanced checksum algorithm also includes the identifier field (LIN 2.0). |
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Sleep & wake up?
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LIN slave can be forced into sleep mode by the master sending a diagnostic request (ID 60) with the first byte equal to 0. Each slave also automatically sleeps after 4 seconds of bus inactivity.
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