AMIS-30624 Datasheet, PDF (27/56 Pages) AMI SEMICONDUCTOR – I2C Microstepping Motordriver

AMIS-30624 I²C Microstepping Motordriver
Data Sheet
Irun[3:0]
Ihold[3:0]
StepMode
Shaft
Current amplitude value to be fed to each coil of the steppermotor. The table below provides the 16 possible values
for IRUN.
Index
Irun
Run Current (mA)
0
0000
59
1
0001
71
2
0010
84
3
0011
100
4
0100
119
5
0101
141
6
0110
168
7
0111
200
8
1000
238
9
1001
283
A
1010
336
B
1011
400
C
1100
476
D
1101
566
E
1110
673
F
1111
800
Hold current for each coil of the steppermotor. The table below provides the 16 possible values for IHOLD.
Index
Ihold
Hold Current (mA)
0
0000
59
1
0001
71
2
0010
84
3
0011
100
4
0100
119
5
0101
141
6
0110
168
7
0111
200
8
1000
238
9
1001
283
A
1010
336
B
1011
400
C
1100
476
D
1101
566
E
1110
673
F
1111
0
Indicator of stepping mode to be used.
StepMode
Step Mode
0
0
1/2 stepping
0
1
1/4 stepping
1
0
1/8 stepping
1
1
1/16 stepping
Indicator of reference position. If Shaft = ‘0’, the reference position is the maximum inner position, whereas if
Shaft = ‘1’, the reference position is the maximum outer position.
SecPos[10:0] Secure position of the steppermotor. This is the position to which the motor is driven in case HW connection is lost. If
SecPos[10:0] = “100 0000 0000”, this means that secure position is disabled, e.g. the steppermotor will be kept in
the position occupied at the moment these events occur.
The secure position is coded on 11 bits only, providing actually the most significant bits of the position, the non coded
least significant bits being set to ‘0’. See also Table 10.
AMI Semiconductor – Apr. 2007, Rev 3.1, M-20664-003
27
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