AMIS-30623 Datasheet, PDF (18/65 Pages) AMI SEMICONDUCTOR – LIN Microstepping Motordriver

AMIS-30623
+10000
0
+20000
ActPos = +30000
Motion direction
-10000
TagPos = -30000
-20000
Figure 10: Motion Direction is Function of Difference between ActPos and TagPos
14.1.4. Hardwired Address HW2
In Figure 11 a simplified schematic diagram is shown of the HW2 comparator circuit. The HW2 pin is sensed via 2 switches. The
DriveHS and DriveLS control lines are alternatively closing the top and bottom switch connecting HW2 pin with a current to resistor
converter. Closing S_TOP (DriveHS = 1) will sense a current to GND. In that case the top IÆ R convertor output is low, via the closed
passing switch S_{PASS_T} this signal is fed to the “R” comparator which output HW2_Cmp is high. Closing bottom switch S_BOT (DriveLS =
1) will sense a current to VBAT. The corresponding IÆ R converter output is low and via S_{PASS_B} fed to the comparator. The output
HW2_Cmp will be high.
IÎ R
S_{PASS_T}
HW2 _STOP
S_BOT
DriveHS
DriveLS
LOGIC
1
2
3
1 = R2GND
2 = R2VBAT
3 = OPEN
IÎ R
"R"-Comp
S_{PASS_B}
R_th
COMP
Debouncer
32 μs
HW2_Cmp
Figure 11: Simplified Schematic Diagram of the HW2 Comparator
Three cases can be distinguished (see also Figure 11):
- HW2 is connected to ground: R2GND or drawing 1
- HW2 is connected to VBAT: R2VBAT or drawing 2
- HW2 is floating: OPEN or drawing 3
Debouncer
64 ms
State
High
Low
Float
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