L9935 Просмотр технического описания (PDF) - STMicroelectronics

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производитель

L9935

Two-phase stepper motor driver

STMicroelectronics 

L9935

5.17

Functional description

Electromagnetic emission classification (EME)

Electromagnetic emission classes presented 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 required in application.

Table 12. Electromagnetic emission

Pin

EME class

Remark

GND

E

10

0 1 test

VCC

E

-

e Blocked with 100nF close in to the device

EN. SDI, CSN, CSK, SDO in

tristate

K

-

h-

SDO

G

-

f SDO in low-Z state, no data transfer

Power output A1, A2, B1, B2

Power output A1, A2, B1, B2

E

5

-

6

f Sourcing output

f

Sinking output in chopping mode

fosc = 20 kHz

Electromagnetic emission is not tested in production.

Figure 13. State diagram

34!.$

"9

NEWTELEGRAM

TURNON $%6)#%/. NOERROR

/.

#(%#+3&/2

%22/23



NEWTELEGRAM

SAMEPOLARITY

NEWTELEGRAM

FLYBACK/+

SHORT

TO63

SHTOORT63

TOGSHNODRT

SHORT

TOGND

/&&

/&&

NEW

TELEGRAM

SHORT

TO63

SHORTTONGNEDW

TELEGRAM

#(%#+).'

&/2%22/23



#(%#+).'

&/2%22/23



NOSHORT

SHORTTO63

SAMEPOLARITYASBEFORE

SHORTTO63

NEWTELEGRAMCURRENT

/.

ORREVERSEPOLARITY

#(%#+).'

&,9"!#+

SHORT

TOGND

SHORTTOGND

NOSHORT

NEW

TELEGRAM

MISSING

FLYBACK

/.



,/')#

3%,%#43

"2!.#(%

$%0%.$).'

/.02%6)/53

34!4%

DIFFERENTPOLARITY

THANBEFORE

'!0'03

Remark: Return to standby is possible from every state

Note:

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

Doc ID 5198 Rev 10

25/29

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