AMIS-30624 AMI Semiconductor, Inc., AMIS-30624 Datasheet - Page 22

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

AMIS-30624 I
15.1.5. External Switch SWI
As illustrated in Figure 12, the SWI comparator is almost identical to HW. 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 Figure 14, a change in state is always synchronized with DriveHS or DriveLS. The same synchronization is valid for
updating the internal position register. This means that after every current pulse (or closing of S
together with the corresponding position is memorized.
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 Figure 13.
Important remark; Every 512µs this information is refreshed.
AMI Semiconductor – Apr. 2007, Rev 3.1, M-20664-003
www.amis.com
1 = R2GND
0
1
2
3
4
5
6
7
8
Byte
2 = R2VBAT 3 = OPEN
Address
Address
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
Content
2
C Microstepping Motordriver
AccShape
VddReset
Bit 7
1
1
1
Figure 12: Simplified Schematic Diagram of the SWI Comparator
Motion[2:0]
SWI
StepLoss
StepMode[1:0]
Figure 13:
AbsThr[3:0]
Bit 6
Irun[3:0]
Vmax[3:0]
1
1
1
GetFullStatus1 Response Frame
S
S
TOP
BOT
GetFullStatus1
ElDef
OTP3
Bit 5
1
1
22
I
I
R
R
DriveHS
DriveLS
Shaft
OTP2
OTP3
I
Bit 4
UV2
ESW
2
Structure
C Commando
1
S
S
PASS_T
PASS_B
R
th
OTP1
OTP2
OVC1
Bit 3
TSD
1
"R"-Comp
OTP0
OTP1
OVC2
Bit 2
TW
DelThr[3:0]
COMP
Ihold[3:0]
1
Vmin[3:0]
Acc[3:0]
SWI_Cmp
TOP
or S
Stall
OTP0
Bit 1
Debouncer
HW
Tinfo[1:0]
LOGIC
1
PC20060926.3
BOT
32 µs
) the state of position switch
CPFail
Bit 0
HW
1
1
Data Sheet
State
Closed
Open