AMIS-30624 AMI Semiconductor, Inc., AMIS-30624 Datasheet - Page 20

• Manufacturer Part Number: AMIS-30624
• Description: I2c Microstepping Motordriver
• Manufacturer: AMI Semiconductor, Inc.

AMIS-30624 I
15.1.4. Hardwired Address HW
In Figure 10 a simplified schematic diagram is shown of the HW comparator circuit.
The HW pin is sensed via two switches S
connecting HW pin with a current to resistor converter. Closing S
R converter output is low, via the closed passing switch S
Closing bottom switch S
fed to the comparator. The output HW_Cmp will be high.
Three cases can be distinguished (see also Figure 10):
Table 15: State Diagram of the HW Comparator
The logic is controlling the correct sequence in closing the switches and in interpreting the 32µs de-bounced HW_Cmp output
accordingly. The output of this small state-machine is corresponding to:
1 = R2GND
Previous State
AMI Semiconductor – Apr. 2007, Rev 3.1, M-20664-003
www.amis.com
Float
Float
Float
Float
High
High
High
High
Low
Low
Low
Low
-
-
-
-
-
-
HW is connected to ground: R2GND or Drawing 1
HW is connected to VBAT: R2VBAT or Drawing 2
HW is floating: OPEN or Drawing 3
High or address = 1
Low or address = 0
Floating
2 = R2VBAT 3 = OPEN
DriveLS
1
1
0
0
1
1
0
0
1
1
0
0
BOT
2
(DriveLS = 1) will sense a current to VBAT. The corresponding I
C Microstepping Motordriver
DriveHS
0
0
1
1
0
0
1
1
0
0
1
1
HW
Figure 10: Simplified Schematic Diagram of the HW Comparator
TOP
HW_Cmp
and S
S
S
0
1
0
1
0
1
0
1
0
1
0
1
TOP
BOT
BOT
. The DriveHS and DriveLS control lines are alternatively closing S
New State
PASS_T
I
I
Float
Float
Float
Float
High
High
High
High
Low
Low
Low
Low
R
R
DriveHS
DriveLS
20
this signal is fed to the “R” comparator which output HW_Cmp is high.
TOP
(DriveHS = 1) will sense a current to GND. In that case the top I
S
S
Condition
PASS_T
PASS_B
R2VBAT or OPEN
R2VBAT or OPEN
R2VBAT or OPEN
R2GND or OPEN
R2GND or OPEN
R2GND or OPEN
R
th
R2VBAT
R2VBAT
R2VBAT
R2GND
R2GND
R2GND
"R"-Comp
COMP
HW_Cmp
Drawing
R converter output is low and via S
1 or 3
2 or 3
1 or 3
2 or 3
1 or 3
2 or 3
Debouncer
LOGIC
2
1
2
1
2
1
32 µs
PC20060926.1
Debouncer
64 ms
Data Sheet
TOP
and S
State
High
Low
Float
PASS_B
BOT
,