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13
Step Translator
Step Mode
The step translator provides the control of the motor
by means of SPI register step mode: SM[2:0], SPI bits DIRP,
RHBP and input pins STEP0, STEP1, DIR (direction of
rotation), RHB (run/hold of motor) and NXT (next pulse).
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 SPI−bits SM[2:0] and pins STEP0, STEP1. Device
takes the value from SPI−bits SM[2:0] and increases
StepMode value with adding binary information from
STEP0, STEP1 pins. After power−on or hard reset, the
coil−current translator is set to the default to 1/32
micro−stepping at position ‘16*’. When remaining in the
default 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.
When the micro−step resolution is reduced, then the
corresponding least−significant bits of the translator
position are set to “0”. This means that the position in the
current table moves to the right and in the case that
micro−step position of desired new resolution does not
overlap the micro−step position of current resolution, the
closest value up or down in required column is set depending
on the direction of rotation.
When the micro−step resolution is increased, then the
corresponding least−significant bits of the translator
position are added as “0”: the micro−step position moves to
the left on the same row.
In general any change of <SM[2:0]> SPI bits or STEP0
and STEP1 pins have no effect on current micro−step
position without consequent occurrence of NXT pulse or
<NXTP> SPI command. (see NXT input timing below).
When NXT pulse or <NXTP> SPI command arrives, the
motor moves into next micro−step position according to the
current <SM[2:0]> SPI bits value and STEP0, STEP1 pins
level set.
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Table 9. CIRCULAR TRANSLATOR TABLE
MSP[6:0
]
Step mode SM[2:0] % of Imax
MSP[6:0
]
Step mode SM[2:0] % of Imax
000 001 010 011 100
Coil
Y
Coil
X
000 001 010 011 100
Coil Y Coil X
1/32 1/16 1/8 1/4 1/2 1/32 1/16 1/8 1/4 1/2
000 0000 0 0 0 0 0 0 100 100 0000 64 32 16 8 4 0 −100
000 0001 1 4.9 99.9 100 0001 65 −4.9 −99.9
000 0010 2 1 9.8 99.5 100 0010 66 33 −9.8 −99.5
000 0011 3 14.7 98.9 100 0011 67 −14.7 −98.9
000 0100 4 2 1 19.5 98.1 100 0100 68 34 17 −19.5 −98.1
000 0101 5 24.3 97 100 0101 69 −24.3 −97
000 0110 6 3 29 95.7 100 0110 70 35 −29 −95.7
000 0111 7 33.7 94.2 100 0111 71 −33.7 −94.2
000 1000 8 4 2 1 38.3 92.4 100 1000 72 36 18 9 −38.3 −92.4
000 1001 9 42.8 90.4 100 1001 73 −42.8 −90.4
000 1010 10 5 47.1 88.2 100 1010 74 37 −47.1 −88.2
000 1011 11 51.4 85.8 100 1011 75 −51.4 −85.8
000 1100 12 6 3 55.6 83.1 100 1100 76 38 19 −55.6 −83.1
000 1101 13 59.6 80.3 100 1101 77 −59.6 −80.3
000 1110 14 7 63.4 77.3 100 1110 78 39 −63.4 −77.3
000 1111 15 67.2 74.1 100 1111 79 −67.2 −74.1
001 0000 16(*) 8 4 2 1 70.7 70.7 101 0000 80 40 20 10 5 −70.7 −70.7
001 0001 17 74.1 67.2 101 0001 81 −74.1 −67.2
001 0010 18 9 77.3 63.4 101 0010 82 41 −77.3 −63.4
001 0011 19 80.3 59.6 101 0011 83 −80.3 −59.6
001 0100 20 10 5 83.1 55.6 101 0100 84 42 21 −83.1 −55.6
001 0101 21 85.8 51.4 101 0101 85 −85.8 −51.4
001 0110 22 11 88.2 47.1 101 0110 86 43 −88.2 −47.1
001 0111 23 90.4 42.8 101 0111 87 −90.4 −42.8
001 1000 24 12 6 3 92.4 38.3 101 1000 88 44 22 11 −92.4 −38.3
001 1001 25 94.2 33.7 101 1001 89 −94.2 −33.7
001 1010 26 13 95.7 29 101 1010 90 45 −95.7 −29
001 1011 27 97 24.3 101 1011 91 −97 −24.3
001 1100 28 14 7 98.1 19.5 101 1100 92 46 23 −98.1 −19.5
001 1101 29 98.9 14.7 101 1101 93 −98.9 −14.7
001 1110 30 15 99.5 9.8 101 1110 94 47 −99.5 −9.8
001 1111 31 99.9 4.9 101 1111 95 −99.9 −4.9
010 0000 32 16 8 4 2 100 0 110 0000 96 48 24 12 6 −100 0
010 0001 33 99.9 −4.9 110 0001 97 −99.9 4.9
010 0010 34 17 99.5 −9.8 110 0010 98 49 −99.5 9.8
010 0011 35 98.9 −14.7 110 0011 99 −98.9 14.7
010 0100 36 18 9 98.1 −19.5 110 0100 100 50 25 −98.1 19.5
010 0101 37 97 −24.3 110 0101 101 −97 24.3
010 0110 38 19 95.7 −29 110 0110 102 51 −95.7 29
*Default position after reset of the translator position.
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Table 9. CIRCULAR TRANSLATOR TABLE
MSP[6:0]
% of ImaxStep mode SM[2:0]
MSP[6:0]
% of ImaxStep mode SM[2:0]
MSP[6:0] Coil XCoil Y
100011010001000
MSP[6:0]Coil XCoil Y
100011010001000
MSP[6:0] Coil XCoil Y
1/21/41/81/161/32
MSP[6:0]Coil XCoil Y
1/21/41/81/161/32
010 0111 39 94.2 −33.7 110 0111 103 −94.2 33.7
010 1000 40 20 10 5 92.4 −38.3 110 1000 104 52 26 13 −92.4 38.3
010 1001 41 90.4 −42.8 110 1001 105 −90.4 42.8
010 1010 42 21 88.2 −47.1 110 1010 106 53 −88.2 47.1
010 1011 43 85.8 −51.4 110 1011 107 −85.8 51.4
010 1100 44 22 11 83.1 −55.6 110 1100 108 54 27 −83.1 55.6
010 1101 45 80.3 −59.6 110 1101 109 −80.3 59.6
010 1110 46 23 77.3 −63.4 110 1110 110 55 −77.3 63.4
010 1111 47 74.1 −67.2 110 1111 111 −74.1 67.2
011 0000 48 24 12 6 3 70.7 −70.7 111 0000 112 56 28 14 7 −70.7 70.7
011 0001 49 67.2 −74.1 111 0001 113 −67.2 74.1
011 0010 50 25 63.4 −77.3 111 0010 114 57 −63.4 77.3
011 0011 51 59.6 −80.3 111 0011 115 −59.6 80.3
011 0100 52 26 13 55.6 −83.1 111 0100 116 58 29 −55.6 83.1
011 0101 53 51.4 −85.8 111 0101 117 −51.4 85.8
011 0110 54 27 47.1 −88.2 111 0110 118 59 −47.1 88.2
011 0111 55 42.8 −90.4 111 0111 119 −42.8 90.4
011 1000 56 28 14 7 38.3 −92.4 111 1000 120 60 30 15 −38.3 92.4
011 1001 57 33.7 −94.2 111 1001 121 −33.7 94.2
011 1010 58 29 29 −95.7 111 1010 122 61 −29 95.7
011 1011 59 24.3 −97 111 1011 123 −24.3 97
011 1100 60 30 15 19.5 −98.1 111 1100 124 62 31 −19.5 98.1
011 1101 61 14.7 −98.9 111 1101 125 −14.7 98.9
011 1110 62 31 9.8 −99.5 111 1110 126 63 −9.8 99.5
011 1111 63 4.9 −99.9 111 1111 127 −4.9 99.9
*Default position after reset of the translator position.
Besides the micro−step modes listed above, also two full
step modes are implemented. Full step mode 1 activates
always only one coil at a time, whereas mode 2 always keeps
2 coils active. The table below lists the output current versus
the translator positions for these cases and Figure 10 shows
the projection on a square.
Changing between micro−step mode and full step modes
follows a similar scheme as changes between micro−step
modes. Changing from one full step mode to another full
step mode will always result in a “45deg step−back or
forward” depending on the DIR bit. For example: in the
table below, when changing full step mode (positioner is on
a particular row and full step column), then the new full step
location will be one row above or below in the adjacent “full
step column”. The step−back and forward is executed after
the NXT pulse.

NCV70514MW003AR2G

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
Motor / Motion / Ignition Controllers & Drivers BIPOLAR STEPPER MOTOR GRE
Lifecycle:
New from this manufacturer.
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