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NCV70522DQ004R2G

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NCV70522DQ
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13
Table 10. CIRCULAR TRANSLATOR TABLE
MSP[6:0]
% of I
max
Stepmode (SM[2:0])
MSP[6:0] Coil yCoil x
100011010001000
MSP[6:0] Coil yCoil x
1/21/41/81/161/32
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
101 0110 86 43 − − − −84.9 −43
101 0111 87 − − − − −87.2 −38.3
101 1000 88 44 22 11 − −89.5 −34.9
101 1001 89 − − − − −91.8 −31.4
101 1010 90 45 − − − −93 −26.7
101 1011 91 − − − − −94.1 −22.1
101 1100 92 46 23 − − −95.3 −17.4
101 1101 93 − − − − −96.5 −12.7
101 1110 94 47 − − − −97.7 −8.1
101 1111 95 − − − − −98.8 −3.5
110 0000 96 48 24 12 6 −100 0
110 0001 97 − − − − −98.8 3.5
110 0010 98 49 − − − −97.7 8.1
110 0011 99 − − − − −96.5 12.7
110 0100 100 50 25 − − −95.3 17.4
110 0101 101 − − − − −94.1 22.1
110 0110 102 51 − − − −93 26.7
110 0111 103 − − − − −91.8 31.4
110 1000 104 52 26 13 − −89.5 34.9
110 1001 105 − − − − −87.2 38.3
110 1010 106 53 − − − −84.9 43
110 1011 107 − − − − −82.6 46.5
110 1100 108 54 27 − − −79 50
110 1101 109 − − − − −75.5 54.6
110 1110 110 55 − − − −72.1 58.1
110 1111 111 − − − − −68.6 61.6
111 0000 112 56 28 14 7 −65.1 65.1
111 0001 113 − − − − −61.6 68.6
111 0010 114 57 − − − −58.1 72.1
111 0011 115 − − − − −54.6 75.5
111 0100 116 58 29 − − −50 79
111 0101 117 − − − − −46.5 82.6
111 0110 118 59 − − − −43 84.9
111 0111 119 − − − − −38.3 87.2
111 1000 120 60 30 15 − −34.9 89.5
111 1001 121 − − − − −31.4 91.8
111 1010 122 61 − − − −26.7 93
111 1011 123 − − − − −22.1 94.1
111 1100 124 62 31 − − −17.4 95.3
111 1101 125 − − − − −12.7 96.5
111 1110 126 63 − − − −8.1 97.7
111 1111 127 − − − − −3.5 98.8
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Start = 0
Step 1
Step 2
Step 3
Start = 0
Step 1
Step 2
Step 3
Start = 0 Step 1
Step 2Step 3
Figure 8. Translator Table: Circular and Square
1/4th Micro Step
SM[2:0] = 011
Uncompensated Half Step
SM[2:0] = 101
Full Step
SM[2:0] = 110
I
Y
I
Y
I
Y
I
X
I
X
I
X
Direction
The direction of rotation is selected by means of following
combination of the DIR input pin and the SPI−controlled
direction bit <DIRCTRL> as illustrated in Table 12.
NXT Input
Changes on the NXT input will move the motor current
one step up/down in the translator table (even when the
motor is disabled). Depending on the NXT−polarity bit
<NXTP> (see Table 12), the next step is initiated either on
the rising edge or the falling edge of the NXT input.
Translator Position
The translator position can be read in SPI Status Register
3. This is a 7−bit number equivalent to the 1/32th micro−step
from Table 10: “Circular Translator Table” above. The
translator position is updated immediately following a NXT
trigger.
NXT
Update
Translator Position
Update
Translator Position
Figure 9. Translator Position Timing Diagram
Synchronization of Step Mode and NXT Input
When step mode is re−programmed to another resolution,
(Figure 10), this is put in effect immediately upon the first
arriving “NXT” input. If the micro−stepping resolution is
increased, the coil currents will be regulated to the nearest
micro−step, according to the fixed grid of the increased
resolution. If however the micro−stepping resolution is
decreased, then it is possible to introduce an offset (or phase
shift) in the micro−step translator table.
If the step resolution is decreased at a translator table
position that is shared both by the old and new resolution
setting, then the offset is zero and micro−stepping proceeds
according to the translator table.
If the translator position is not
shared both by the old and
new resolution setting, then the micro−stepping proceeds
with an offset relative to the translator table (See Figure 10
right hand side).
NCV70522DQ
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DIR
DIR
NXT1
NXT2
NXT3
NXT4
Halfstep
endpos
1/4th Step
Change from lower to higher resolution
startpos
DIR
NXT1
NXT2
NXT3
DIR
endpos
Halfstep
Change from higher to lower resolution
startpos
Figure 10. NXT−Step−Mode Synchronization
Left: change from lower to higher resolution. The left−hand side depicts the ending half−step position during which a new step mode res-
olution was programmed. The right−hand side diagram shows the effect of subsequent NXT commands on the micro−step position.
Right: change from higher to lower resolution. The left−hand side depicts the ending micro−step position during which a new step mode
resolution was programmed. The right−hand side diagram shows the effect of subsequent NXT commands on the half−step position.
NOTE: It is advised to reduce the micro−stepping resolution only at micro−step positions that overlap with desired micro−step positions
of the new resolution.
I
Y
I
X
I
Y
I
X
I
Y
I
X
I
Y
I
X
1/8th Step
Programmable Peak−Current
The amplitude of the current waveform in the motor coils
(coil peak current = I
max
) is adjusted by means of an SPI
parameter “CUR[4:0]” (Table 14). Whenever this parameter
is changed, the coil−currents will be updated immediately at
the next PWM period. Figure 11 presents the Peak−Current
and Current Ranges in conjunction to the Current setting
(CUR[4:0]).
Peak Current
Ipeak (CUR[4:0] = 11111)
Ipeak (CUR[4:0] = 10110)
Ipeak (CUR[4:0] = 01111)
Ipeak (CUR[4:0] = 01000)
0 8 15 22 31 CUR[4:0]
Current Range 3
CUR = 23 −> 31
Current Range 2
CUR = 16 −> 22
Current Range 1
CUR = 9 −> 15
Current
CUR = 0 −> 8
Figure 11. Programmable Peak−Current Overview
Range 0
Speed and Load−Angle Output
The SLA−pin provides an output voltage that indicates the
level of the Back−e.m.f. voltage of the motor. This
Back−e.m.f. voltage is sampled during every so−called “coil
current zero crossings”. Per coil, 2 zero−current positions
exist per electrical period, yielding in total 4 zero−current
observation points per electrical period.
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NCV70522DQ004R2G

Mfr. #:
Buy NCV70522DQ004R2G
Manufacturer:
ON Semiconductor
Description:
Motor / Motion / Ignition Controllers & Drivers SPI STEPPER DVR VREG
Lifecycle:
New from this manufacturer.
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