AMIS-30623 LIN Microstepping Motordriver
Data Sheet
Motion detection is disabled when the RAM registers AbsThr[3:0] and DelThr[3:0] are empty or zero. Both levels can be programmed
using the LIN command SetStallParam in the registers AbsThr[3:0] and DelThr[3:0]. Also in the OTP register AbsThr[3:0] and
DelThr[3:0] can be set using the LIN command SetOTPParam. These values are copied in the RAM registers during power on reset.
Value Table:
Table 26: Absolute Threshold Settings
Table 27: Delta Threshold Settings
AbsThr index
AbsThr level (V)
DelThr index DelThr level (V)
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Disable
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Disable
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
3.25
3.50
3.75
MinSamples
MinSamples[2:0] is a Bemf sampling delay time expressed in number of PWM cycles, for more information please refer to the white
paper “Robust Motion Control with AMIS-3062x Stepper Motor Drivers”,
Table 28: Back EMF Sample Delay Time
tDELAY (µs)
Index
MinSamples[2:0]
PWMfreq = 0
PWMfreq = 1
0
1
2
3
4
5
6
7
000
001
010
011
100
101
110
111
87
43
65
87
109
130
152
174
196
130
174
217
261
304
348
391
FS2StallEn
If AbsThr or DelThr <>0 (i.e. motion detection is enabled), then stall detection will be activated AFTER the acceleration ramp + an
additional number of full-steps, according to the following table :
Table 29: Activation Delay of Motion Detection
Index
FS2StallEn[2:0]
Delay (Full Steps)
0
1
2
3
4
5
6
7
000
001
010
011
100
101
110
111
0
1
2
3
4
5
6
7
For more information please refer to the white paper “Robust Motion Control with AMIS-3062x Stepper Motor Drivers”,
DC100SDis
When a motor with large bemf is operated at high speed and low supply voltage, then the PWM duty cycle can be as high as 100%.
This indicates that the supply is too low to generate the required torque and might also result in erroneously triggering the stall
detection. The bit “DC100SDis” disables stall detection when duty cycle is 100%. For more information please refer to the white paper
“Robust Motion Control with AMIS-3062x Stepper Motor Drivers”,
AMI Semiconductor – June 2006, Rev 3.0
40
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