here usually only one Stepper motor driver is selected at a time while all others are deselected.

Application Information

For driving a stepper motor we suggest to use the following codes. The columned ’SDO correct’ shows

the data returned at SDO in correct function. The columnes presented under ’Error cases’ display the di-

agnosis bits if errors are detected.

Examples of control sequences

Full step mode control sequences and diagnosis response.

SDI

SDO

correct

Error cases and SDObit7, bit6

A

O

P

E

N

B

O

P

E

N

A1

S

H

O

R

T

VS

A2

S

H

O

R

T

VS

B1

S

H

O

R

T

VS

B2

S

H

O

R

T

VS

A1

*)

S

H

O

R

T

GND

A2

*)

S

H

O

R

T

GND

B1

*)

S

H

O

R

T

GND

B2

*)

S

H

O

R

T

GND

therm.

alarm

therm.

shut

down

(reset

operating

codes)

bit

76543210

76543210

76

76

76

76

76

76

76

76

76

76

76

76543210

XX111111

SDO PRESENT LAST DATA OR 11111111 IN CASE PREV. STATE WAS STAND BY

XX011011

XX010011

XX010010

XX011010

XX011011

XX010011

XX010010

XX011010

11111111

11011011

11010011

11010010

11011010

11011011

11010011

11010010

11

11

01

11

01

11

01

11

11

11

11

01

11

01

11

01

11

11

01

01

01

11

01

01

11

01

01

11

01

01

01

11

11

11

11

01

01

01

11

01

11

01

01

01

11

01

01

01

11

10

01

11

10

10

01

11

11

11

10

10

01

11

10

10

11

10

10

01

11

10

10

01

11

11

11

10

10

01

11

10

00

00

00

00

00

00

00

00

00111111

00111111

00111111

00111111

00111111

00111111

00111111

00111111

SDI

SDO

SCK

CSN1

CSN2

µP

SDI

SDO

SCK

CSN

SDI

SDO

SCK

CSN

no.1

no.2

D99AT440

Figure 10. Paralleling several Devices.

*) Motor resistance approximatelly 10

the motor may lead to detection of short to ground on both branches of the bridge leading to code 10 on all steps.

L9935

14/19