NCV70522MN(2012) Ver la hoja de datos (PDF) - ON Semiconductor

Número de pieza

componentes Descripción

Fabricante

NCV70522MN
(Rev.:2012)

Micro-Stepping Motor Driver

ON Semiconductor 

NCV70522MN

Change from lower to higher resolution

IY

DIR

IY

DIR

NXT2

NXT3

NXT1

endpos NXT4

startpos

IX

IX

Change from higher to lower resolution

IY

DIR

endpos

IY

DIR

NXT1 startpos

NXT2

IX NXT3

IX

Halfstep

1/4th Step

1/8th Step

Halfstep

Figure 11. 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.

Programmable Peak−Current

The amplitude of the current waveform in the motor coils

(coil peak current = Imax) 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 12 presents the Peak−Current

and Current Ranges in conjunction to the Current setting

(CUR[4:0]).

Ipeak (CUR[4:0] = 11111)

Peak Current

Current Range 3

CUR = 23 −> 31

Ipeak (CUR[4:0] = 10110)

Current Range 2

CUR = 16 −> 22

Ipeak (CUR[4:0] = 01111)

Ipeak (CUR[4:0] = 01000)

Current Range 1

CUR = 9 −> 15

Current

Range 0

CUR = 0 −> 8

0

8

15

22

31

Figure 12. Programmable Peak−Current Overview

CUR[4:0]

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

http://onsemi.com

16

Share Link: