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Figure 6. Automatic Duty Cycle Adaptation
Actual value
Duty Cycle
< 50%
Duty Cycle > 50%
Duty Cycle < 50%
t
Icoil
Set value
T
PWM
Step Translator
Step Mode
The step translator provides the control of the motor by
means of SPI register Stepmode: SM[2:0], SPI register
DIRCNTRL, and input pins DIR and NXT. It is translating
consecutive steps in corresponding currents in both motor
coils for a given step mode.
One out of seven possible stepping modes can be selected
through SPIbits SM[2:0] (Table 24: SPI Control Parameter
Overview SM[2:0]) After poweron or hard reset, the
coilcurrent translator is set to the default 1/32
microstepping at position ‘0’. Upon changing the step
mode, the translator jumps to position 0* of the
corresponding stepping mode. When remaining in the same
step mode, subsequent translator positions are all in the same
column and increased or decreased with 1. Table 9 lists the
output current versus the translator position.
As shown in Figure 7 the output currentpairs can be
projected approximately on a circle in the (I
x
,I
y
) plane.
There is, however, one exception: uncompensated half step.
In this step mode the currents are not regulated to a fraction
of Imax but are in all intermediate steps regulated at 100
percent. In the (I
x
,I
y
) plane the currentpairs are projected
on a square. Table 8 lists the output current versus the
translator position for this case.
Table 8. Square Translator Table for Full Step and Uncompensated Half Step
MSP[6:0]
Stepmode ( SM[2:0] ) % of Imax
101 110
Coil x Coil y
Uncompensated HalfStep Full Step
000 0000 0* 0 100
001 0000 1 1 100 100
010 0000 2 100 0
011 0000 3 2 100 100
100 0000 4 0 100
101 0000 5 3 100 100
110 0000 6 100 0
111 0000 7 0* 100 100
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Table 9. Circular Translator Table
MSP[6:0]
Stepmode ( SM[2:0] ) % of Imax
000 001 010 011 100
Coil x Coil y
1/32 1/16 1/8 1/4 1/2
000 0000 ‘0’ 0* 0* 0* 0* 0 100
000 0001 1 3.5 98.8
000 0010 2 1 8.1 97.7
000 0011 3 12.7 96.5
000 0100 4 2 1 17.4 95.3
000 0101 5 22.1 94.1
000 0110 6 3 26.7 93
000 0111 7 31.4 91.8
000 1000 8 4 2 1 34.9 89.5
000 1001 9 38.3 87.2
000 1010 10 5 43 84.9
000 1011 11 46.5 82.6
000 1100 12 6 3 50 79
000 1101 13 54.6 75.5
000 1110 14 7 58.1 72.1
000 1111 15 61.6 68.6
001 0000 16 8 4 2 1 65.1 65.1
001 0001 17 68.6 61.6
001 0010 18 9 72.1 58.1
001 0011 19 75.5 54.6
001 0100 20 10 5 79 50
001 0101 21 82.6 46.5
001 0110 22 11 84.9 43
001 0111 23 87.2 38.3
001 1000 24 12 6 3 89.5 34.9
001 1001 25 91.8 31.4
001 1010 26 13 93 26.7
001 1011 27 94.1 22.1
001 1100 28 14 7 95.3 17.4
001 1101 29 96.5 12.7
001 1110 30 15 97.7 8.1
001 1111 31 98.8 3.5
010 0000 32 16 8 4 2 100 0
010 0001 33 98.8 3.5
010 0010 34 17 97.7 8.1
010 0011 35 96.5 12.7
010 0100 36 18 9 95.3 17.4
010 0101 37 94.1 22.1
010 0110 38 19 93 26.7
010 0111 39 91.8 31.4
010 1000 40 20 10 5 89.5 34.9
010 1001 41 87.2 38.3
010 1010 42 21 84.9 43
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Table 9. Circular Translator Table
MSP[6:0]
% of ImaxStepmode ( SM[2:0] )
MSP[6:0] Coil yCoil x
100011010001000
MSP[6:0] Coil yCoil x
1/21/41/81/161/32
010 1011 43 82.6 46.5
010 1100 44 22 11 79 50
010 1101 45 75.5 54.6
010 1110 46 23 72.1 58.1
010 1111 47 68.6 61.6
011 0000 48 24 12 6 3 65.1 65.1
011 0001 49 61.6 68.6
011 0010 50 25 58.1 72.1
011 0011 51 54.6 75.5
011 0100 52 26 13 50 79
011 0101 53 46.5 82.6
011 0110 54 27 43 84.9
011 0111 55 38.3 87.2
011 1000 56 28 14 7 34.9 89.5
011 1001 57 31.4 91.8
011 1010 58 29 26.7 93
011 1011 59 22.1 94.1
011 1100 60 30 15 17.4 95.3
011 1101 61 12.7 96.5
011 1110 62 31 8.1 97.7
011 1111 63 3.5 98.8
100 0000 64 32 16 8 4 0 100
100 0001 65 3.5 98.8
100 0010 66 33 8.1 97.7
100 0011 67 12.7 96.5
100 0100 68 34 17 17.4 95.3
100 0101 69 22.1 94.1
100 0110 70 35 26.7 93
100 0111 71 31.4 91.8
100 1000 72 36 18 9 34.9 89.5
100 1001 73 38.3 87.2
100 1010 74 37 43 84.9
100 1011 75 46.5 82.6
100 1100 76 38 19 50 79
100 1101 77 54.6 75.5
100 1110 78 39 58.1 72.1
100 1111 79 61.6 68.6
101 0000 80 40 20 10 5 65.1 65.1
101 0001 81 68.6 61.6
101 0010 82 41 72.1 58.1
101 0011 83 75.5 54.6
101 0100 84 42 21 79 50
101 0101 85 82.6 46.5

AMIS30511C5112RG

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
Motor / Motion / Ignition Controllers & Drivers 800MA STEPPER DRIVER
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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