L6460 datasheet(66/139 Pages) STMICROELECTRONICS

66 / 139 page

Power bridges

L6460

66/139

Doc ID 17713 Rev 1

The allowable control modes are as follows:

Stepping sequence left to external microcontroller: in this mode the current level in

each motor winding is set by the microcontroller via the serial interface.

Full step: in this mode the electrical angle will change by 90° steps at each StepReq

signal transition. There are two possibilities:

–

Normal step (two phases on): in normal step mode both windings are energized

simultaneously and the current will be alternately reversed. The resulting electrical

angles will be 45°, 135°, 225° and 315°.

–

Wave drive (one phase on): In wave drive mode each winding is alternately

energized and reversed. The resulting electrical angles will be 90°, 180° and 270°

and 360°.

Half step: in this mode, one motor winding is energized and then two windings

alternately so the electrical angles the motor will do when rotating in clockwise direction

and using the same current limit in both the phases are: 45°, 90°, 135°, 180°, 225°,

270°, 315° and 360°.

Microstepping: in this mode the current in each motor winding has a quasi sinusoidal

profile. The increment between each step is obtained at each transition of StepCmd bit

in StepCmd register. The difference between each step could be chosen (4, 8 or 16

levels for each phase) according to following table:

Note:

When in 1/16 step mode, the best phase approximation of sinusoidal wave, is obtained by

repeating the “F” step as follows: 0, 1, 2, 3, … , D, E, F, F, F, E, D, … , 3, 2, 1, 0

When internal stepping sequence generation is used, the stepping direction is set by the

StepDir bit according to the Table 23.

Table 21.

Sequencer driver

StepFromGpio

Sequencer driver

StepCmd bit in StepCmd register.

GPIO12 input pin.

Table 22.

Stepper driving mode

StepCtrlMode[2:0]

Control mode

Description

000 or 111

No Control

Stepping sequence control left to the external

controller

001

Half Step

Half step

010

Normal Step

Full step (two phases on)

011

Wave Drive

Full step (one phase on)

100

1/4 Step

Four micro steps

101

1/8 Step

Eight micro steps

110

1/16 Step

Sixteen micro steps

L6460 датащи(PDF) 66 Page - STMicroelectronics

L6460 датащи(HTML) 66 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL