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NCV70627DQ001R2G Datasheet(PDF) 38 Page - ON Semiconductor |
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NCV70627DQ001R2G Datasheet(HTML) 38 Page - ON Semiconductor |
38 / 61 page NCV70627 www.onsemi.com 38 Physical Address of the Circuit The circuit must be provided with a physical address in order to discriminate this circuit from other ones on the LIN bus. This address is coded on 7 bits, yielding the theoretical possibility of 128 different circuits on the same bus. It is a combination of 4 OTP memory bits and of the 3 hardwired address bits (pins HW[2:0]). However the maximum number of nodes in a LIN network is also limited by the physical properties of the bus line. It is recommended to limit the number of nodes in a LIN network to not exceed 16. Otherwise the reduced network impedance may prohibit a fault free communication under worst case conditions. Every additional node lowers the network impedance by approximately 3%. The node address is a combination of 4 OTP memory bits and 3 hardwired address bits (pins HW[2:0]). Depending on the Addressing Mode (ADM–bit in OTP) the bits of the address are combined as illustrated below. PA3 PA2 PA1 PA0 HW1 MSB LSB OTP memory HW0 HW2 Hardwired <ADM> = 1 OTP memory PA3 PA2 PA1 PA0 HW1 MSB LSB OTP memory HW0 HW2 Hardwired <ADM> = 0 Figure 21. Combination of OTP and Hardwired Address Bits in Function of ADM (Address Mode) NOTE: Pins HW0 and HW1 are 3.3 V digital inputs, whereas pin HW2 is compliant with a 12 V level, e.g. it can be connected to Vbat or Gnd via a terminal of the PCB. For SetPositionShort it is recommended to set HW0, HW1 and HW2 to ’1’. LIN Frames The LIN frames can be divided in writing and reading frames. A frame is composed of an 8−bit Identifier followed by 2, 4 or 8 data−bytes and a checksum byte. Note: The checksum is conform LIN1.3, classic checksum calculation over only data bytes. (Checksum is an inverted 8−bit sum with carry over all data bytes.) Writing frames will be used to: • Program the OTP Memory; • Configure the component with the stepper−motor parameters (current, speed, stepping−mode, etc.); • Provide set−point position for the stepper−motor; • Control the motion state machine. Whereas reading frames will be used to: • Get the actual position of the stepper−motor; • Get status information such as error flags; • Verify the right programming and configuration of the component. Writing Frames The LIN master sends commands and/or information to the slave nodes by means of a writing frame. According to the LIN specification, identifiers are to be used to determine a specific action. If a physical addressing is needed, then some bits of the data field can be dedicated to this, as illustrated in the example below. Identifier Byte Data Byte 1 Data Byte 2 ID0 ID1 ID2 ID3 ID4 ID5 ID6 ID7 phys. address command parameters (e.g. position) <ID6> and <ID7> are used for parity check over <ID0> to <ID5>, conform LIN1.3 specification. <ID6> = <ID0> ⊗ <ID1> ⊗ <ID2> ⊗ <ID4> (even parity) and <ID7> = NOT(<ID1> ⊗ <ID3> ⊗ <ID4> ⊗ <ID5>) (odd parity). |
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