AMIS-30623 Datasheet, PDF (38/65 Pages) AMI SEMICONDUCTOR – LIN Microstepping Motordriver

AMIS-30623
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
AbsThr Index AbsThr Level (V)
0
Disable
1
0.5
2
1.0
3
1.5
4
2.0
5
2.5
6
3.0
7
3.5
8
4.0
9
4.5
A
5.0
B
5.5
C
6.0
D
6.5
E
7.0
F
7.5
Table 27: Delta Threshold Settings
DelThr Index DelThr Level (V)
0
Disable
1
0.25
2
0.50
3
0.75
4
1.00
5
1.25
6
1.50
7
1.75
8
2.00
9
2.25
A
2.50
B
2.75
C
3.00
D
3.25
E
3.50
F
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
Index
MinSamples[2:0]
t_DELAY (μs)
PWMfreq = 0 PWMfreq = 1
0
000
87
43
1
001
130
65
2
010
174
87
3
011
217
109
4
100
261
130
5
101
304
152
6
110
348
174
7
111
391
196
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
000
0
1
001
1
2
010
2
3
011
3
4
100
4
5
101
5
6
110
6
7
111
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”,
Rev. 4 | Page 38 of 65 | www.onsemi.com