AMIS-30621 Datasheet, PDF (18/59 Pages) AMI SEMICONDUCTOR – LIN Microstepping Motordriver

AMIS−30621
Table 15. STATE DIAGRAM OF THE HW2 COMPARATOR
Previous
State
DriveLS
DriveHS
HW2_Cmp
New State
Float
1
0
0
Float
Float
1
0
1
High
Float
0
1
0
Float
Float
0
1
1
Low
Low
1
0
0
Low
Low
1
0
1
High
Low
0
1
0
Float
Low
0
1
1
Low
High
1
0
0
Float
High
1
0
1
High
High
0
1
0
High
High
0
1
1
Low
Condition
R2GND or OPEN
R2VBAT
R2VBAT or OPEN
R2GND
R2GND or OPEN
R2VBAT
R2VBAT or OPEN
R2GND
R2GND or OPEN
R2VBAT
R2VBAT or OPEN
R2GND
Drawing
1 or 3
2
2 or 3
1
1 or 3
2
2 or 3
1
1 or 3
2
2 or 3
1
The logic is controlling the correct sequence in closing the
switches and in interpreting the 32 ms debounced
HW2_Cmp output accordingly. The output of this small
state−machine is corresponding to:
• High or address = 1
• Low or address = 0
• Floating
As illustrated in the table above (Table 15), the state is
depending on the previous state, the condition of the 2
switch controls (DriveLS and DriveHS) and the output of
HW2_Cmp. The figure below is showing an example of a
practical case where a connection to VBAT is interrupted.
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