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NCV70627DQ001R2G Datasheet(PDF) 38 Page - ON Semiconductor

Part # NCV70627DQ001R2G
Description  Micro-stepping Motor Driver
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCV70627DQ001R2G Datasheet(HTML) 38 Page - ON Semiconductor

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NCV70627
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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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