AMIS-30624_13 Datasheet, PDF (19/52 Pages) ON Semiconductor – I2C Micro-stepping Motor Driver

AMIS−30624, NCV70624
Table 15. STATE DIAGRAM OF THE HW COMPARATOR
Previous State
DriveLS DriveHS
HW_Cmp
Float
1
0
0
Float
1
0
1
Float
0
1
0
Float
0
1
1
Low
1
0
0
Low
1
0
1
Low
0
1
0
Low
0
1
1
High
1
0
0
High
1
0
1
High
0
1
0
High
0
1
1
New State
Float
High
Float
Low
Low
High
Float
Low
Float
High
High
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 HW_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
HW_Cmp. Figure 11 shows an example of a practical case
where a connection to VBAT is interrupted.
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