AMIS-30623 AMI Semiconductor, Inc., AMIS-30623 Datasheet - Page 40

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

AMIS-30623 LIN Microstepping Motordriver
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
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
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
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
www.amis.com
AbsThr index
Index
Index
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
MinSamples[2:0]
FS2StallEn[2:0]
000
001
010
011
100
101
110
111
AbsThr level (V)
000
001
010
011
100
101
110
111
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
PWMfreq = 0
130
174
217
261
304
348
391
Delay (Full Steps)
87
t
DELAY
0
1
2
3
4
5
6
7
(µs)
PWMfreq = 1
Table 27: Delta Threshold Settings
109
130
152
174
196
43
65
87
DelThr index
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
40
DelThr level (V)
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
Data Sheet