AMIS-30623 AMI Semiconductor, Inc., AMIS-30623 Datasheet - Page 20

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

AMIS-30623 LIN Microstepping Motordriver
15.1.4. Hardwired Address HW2
In
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
I
high. Closing bottom switch S
S
3 cases can be distinguished (see also Figure 11):
Table 16: State Diagram of the HW2 Comparator
The logic is controlling the correct sequence in closing the switches and in interpreting the 32 µs debounced HW2_Cmp output
accordingly. The output of this small state-machine is corresponding to:
Previous State
PASS_B
AMI Semiconductor – June 2006, Rev 3.0
www.amis.com
Figure 11
R convertor output is low, via the closed passing switch S
Float
Float
Float
Float
High
High
High
High
fed to the comparator. The output HW2_Cmp will be high.
Low
Low
Low
Low
1
-
-
-
-
-
-
a simplified schematic diagram is shown of the HW2 comparator circuit.
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
High or address = 1
Low or address = 0
Floating
1 = R2GND
2 = R2VBAT
3 = OPEN
2
DriveLS
1
1
0
0
1
1
0
0
1
1
0
0
BOT
3
DriveHS
(DriveLS = 1) will sense a current to VBAT. The corresponding I
HW2
0
0
1
1
0
0
1
1
0
0
1
1
Figure 11: Simplified Schematic Diagram of the HW2 Comparator
S
S
TOP
BOT
HW2_Cmp
0
1
0
1
0
1
0
1
0
1
0
1
I
I
R
R
DriveHS
DriveLS
PASS_T
New State
20
Float
Float
Float
Float
High
High
High
High
Low
Low
Low
Low
S
S
TOP
PASS_T
PASS_B
this signal is fed to the “R” comparator which output HW2_Cmp is
R
(DriveHS = 1) will sense a current to GND. In that case the top
th
Condition
R2GND or OPEN
R2VBAT
R2VBAT or OPEN
R2GND
R2GND or OPEN
R2VBAT
R2VBAT or OPEN
R2GND
R2GND or OPEN
R2VBAT
R2GND
R2VBAT or OPEN
"R"-Comp
COMP
HW2_Cmp
Debouncer
LOGIC
32 µs
Drawing
1 or 3
2 or 3
1 or 3
2 or 3
1 or 3
2 or 3
R converter output is low and via
2
1
2
1
2
1
Debouncer
64 ms
Data Sheet
State
High
Low
Float