AMIS-30623 AMI Semiconductor, Inc., AMIS-30623 Datasheet - Page 44

• Manufacturer Part Number: AMIS-30623
• Description: Lin Microstepping Motordriver
• Manufacturer: AMI Semiconductor, Inc.

AMIS-30623 LIN Microstepping Motordriver
16.6 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.
Writing frames will be used to:
Whereas reading frames will be used to:
16.6.1. Writing Frames
A writing frame is sent by the LIN master to send commands and/or information to the slave nodes. 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.
Another possibility is to determine the specific action within the data field in order to use less identifiers. One can for example use the
reserved identifier 0x3C and take advantage of the 8 byte data field to provide a physical address, a command and the needed
parameters for the action, as illustrated in the example below.
Note:
Bit 7 of byte Data1 must be at ‘1’ since the LIN specification requires that contents from 0x00 to 0x7F must be reserved for broadcast messages (0x00 being for the “Sleep”
message). See also LIN command
The writing frames used with the AMIS-30623 are the following:
ID0 ID1 ID2 ID3 ID4 ID5 ID6 ID7
ID0 ID1 ID2 ID3 ID4 ID5 ID6 ID7
AMI Semiconductor – June 2006, Rev 3.0
0x3C
www.amis.com
ID
• 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.
• Get the actual position of the stepper-motor;
• Get status information such as error flags;
• Verify the right programming and configuration of the component.
• Type #1: General purpose 2 or 4 data bytes writing frame with a dynamically assigned identifier. This type is dedicated to
• Type #2: 2, 4 or 8 data bytes writing frame with an identifier dynamically assigned to an application command, regardless of
• Type #3: 2 data bytes writing frame with an identifier dynamically assigned to a particular slave node together with an
• Type #4: 8 data bytes writing frame with 0x3C identifier.
00
Identifier byte
ID
AppCmd
Data1
short writing actions when the bus load can be an issue. They are used to provide direct command to one (Broad =
‘1’) or all the slave nodes (Broad = ‘0’). If Broad = ‘1’, the physical address of the slave node is provided by the 7
remaining bits of DATA2. DATA1 will contain the command code (see
present, DATA3 to DATA4 will contain the command parameters, as shown below.
the physical address of the circuit.
application command. This type of frame requires that there are as many dynamically assigned identifiers as there
are AMIS-30623 circuits using this command connected to the LIN bus.
1
command
Data2
Sleep
command
phys. address
physical
address
Data1
Data3
Data byte 1
Data4
Physical address
command parameters (e.g. position)
Data5
Data2
44
parameters
Data6
Broad
Data byte 2
Data7
parameters…
Data3…
Dynamic assignment of
Data8
Identifiers), while, if
Data Sheet