AMIS-30623 AMI Semiconductor, Inc., AMIS-30623 Datasheet - Page 22

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

AMIS-30623 LIN Microstepping Motordriver
15.1.5. External Switch SWI
As illustrated in Figure 13 the SWI comparator is almost identical to HW2. The major difference is in the limited number of states. Only
open or closed is recognised leading to respectively ESW = 0 and ESW = 1.
As illustrated in
updating the internal position register. This means that after every current pulse (or closing of S
together with the corresponding position is memorised.
Using the GetActualPos commands reads back the ActPos register and the status of ESW. In this way the master node may get
synchronous information about the state of the switch together with the position of the motor. See
Important remark. Every 512µs this information is refreshed.
AMI Semiconductor – June 2006, Rev 3.0
www.amis.com
1
Figure 15
1 = R2GND
2 = R2VBAT
3 = OPEN
Byte
0
1
2
3
4
2
a change in state is always synchronised with DriveHS or DriveLS. The same synchronisation is valid for
Content
Identifier
Data 1
Data 2
Data 3
Data 4
3
Figure 13: Simplified Schematic Diagram of the SWI Comparator
SWI
VddReset
Bit 7
ESW
*
Figure 14:
S
S
TOP
BOT
StepLoss
Bit 6
*
Reading Frame
GetActualPos
I
I
22
R
R
DriveHS
DriveLS
ElDef
Bit 5
1
ActPos[15:8]
ActPos[7:0]
LIN commando
S
S
Structure
PASS_T
PASS_B
Bit 4
UV2
R
0
th
AD[6:0]
Bit 3
ID3
TSD
"R"-Comp
COMP
SWI_Cmp
Bit 2
ID2
TW
TOP
Figure 14
32 µs Debouncer
LOGIC
or S
Bit 1
Tinfo[1:0]
ID1
BOT
) the state of position switch
below:
Bit 0
ID0
State
Closed
Open
Data Sheet