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 11. State diagram.

STAND

BY

new telegram

turn on DEVICE ON no error

ON

CHECKS FOR

11

ERRORS 11

new telegram

same polarity

new telegram

flyback OK

short

to VS

shtoorVt S

to gshnodrt

short

to gnd

new telegram current = 0

ON

CHECKING

or reverse polarity FLYBACK 6

OFF

new

telegram

shor t

to VS

OFF

short

to

gnd

new

telegram

shor t

to gnd

short to gnd

CHECKING

FOR ERRORS

01

CHECKING

FOR ERRORS

10

no short

new

telegram

missing

flyback

ON

01

no short

short to VS

same polarity as before

short to VS

LOGIC

SELECTS

BRANCHE

DEPENDING

ON PREVIOUS

STATE

different polar ity

than before

D99AT441

Remark: Return to stand by is possible from every state

Note: Reversing polarity in low current mode no flyback check will be performed.

Electromagnetic Emission classification(EME)

Electromagnetic Emission classes presentel below are typical data found on bench test. For detailed test

description please refer to ’Electromagnetic Emission (EME) Measurement of Integrated Circuits, DC to

1GHz’ of VDE/ZVEI work group 767.13 and VDE/ZVEI work group 767.14 or IEC project number 47A

1967Ed. This data is targeted to board designers to allow an estimation of emission filtering effort re-

quired in application.

Pin

GND

VCC

EN, SDI, CSN, SCK, SDO in tristate

SDO

Power output A1, A2, B1, B2

Power output A1, A2, B1, B2

EME class

E

10

o

E

e

K

h

G

f

E

5

f

6

f

Remark

1Ω test

Blocked with 100nF close to the device

SDO in low-state, no data transfer

Sourcing output

Sinking output in chopping mode fOSC = 20kHz

Electromagnetic Emission is not tested in production.

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