L9935(1999) Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

L9935
(Rev.:1999)

TWO-PHASE STEPPER MOTOR DRIVER

STMicroelectronics 

L9935

Figure 10. Paralleling several Devices.

SDI

SDO

µP SCK

CSN1

CSN2

no.1

SDI

SCK

CSN

SDO

no.2

SDI

SCK

CSN

SDO

D99AT440

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 B A1 A2 B1 B2 A1 A2 B1 B2 therm. therm.

*) *) *) *)

O O S S S S S S S S alarm

shut

P PHHHHHHHH

down

E E OOOOOOOO

(reset

N NR R R RR RR R

operating

TT TTTT T T

codes)

VS VS VS VS GND GND GND GND

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 11111111 11 11 11 11 11 11 11 11 11 11 00 00111111

XX010011 11011011 11 11 11 01 11 01 10 11 10 11 00 00111111

XX010010 11010011 01 11 01 01 11 01 01 10 10 11 00 00111111

XX011010 11010010 11 01 01 11 01 01 11 10 01 10 00 00111111

XX011011 11011010 01 11 01 01 01 11 10 01 11 10 00 00111111

XX010011 11011011 11 01 11 01 01 01 10 11 10 01 00 00111111

XX010010 11010011 01 11 01 01 11 01 01 10 10 11 00 00111111

XX011010 11010010 11 01 01 11 01 01 11 10 01 10 00 00111111

*) Motor resistance approximatelly 10Ω and VS = 12V. So a short to ground only is detected on one branche of the bridge. Lower resistivity of

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

14/19

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