AMIS-30623 Datasheet, PDF (59/65 Pages) AMI SEMICONDUCTOR – LIN Microstepping Motordriver

AMIS-30623
SoftStop
If a SoftStop command occurs during a motion of the stepper motor, it provokes an immediate deceleration to Vmin (see Minimum
Velocity) followed by a stop, regardless of the position reached. Once the motor is stopped, TagPos register is overwritten with value in
ActPos register to ensure keeping the stop position.
Note: a SoftStop command occurring during a DualPosition sequence is not taken into account.
Command SoftStop occurs in the following cases:
• The chip temperature rises above the thermal shutdown threshold (see DC Parameters and Temperature Management);
• The LIN master requests a SoftStop. Hence SoftStop will correspond to the following two data bytes LIN writing frame (type #1).
Byte
0
1
2
Where:
(*)
Broad:
Content
Identifier
Data 1
Data 2
Bit 7
*
1
Broad
SoftStop Writing Frame
Structure
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2
*
0
ID4 ID3 ID2
CMD[6:0] = 0x0F
AD[6:0]
Bit 1
ID1
Bit 0
ID0
according to parity computation
If broad = ‘0’ all the stepper motors connected to the LIN bus will stop with deceleration.
TestBemf
This command is provided to the circuit by the LIN Master in order to output the Bemf integrator output
To the SWI output of the chip. Once activated, it can be stopped only after POR. During the Bemf observation, reading of the SWI
state is internally forbidden.
TestBemf corresponds to the following LIN writing frames (type #1).
Byte
0
1
2
Where:
(*)
Broad:
Content
Identifier
Data 1
Data 2
TestBemf Writing Frame
Structure
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2
*
*
0
ID4 ID3 ID2
1
CMD[6:0] = 0x1F
Broad
AD[6:0]
Bit 1
ID1
Bit 0
ID0
according to parity computation
If broad = ‘0’ all the stepper motors connected to the LIN bus will be affected.
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