L6238 datasheet(8/35 Pages) STMICROELECTRONICS

8 / 35 page

a)the spindle is stopped.

b)the system is still running at a speed that

allows for resynchronization.

In order to minimize the ramp up time, the micro-

controller has the possibility to:

check the SPIN SENSE pin, (which toggles at

the Bemf zero crossing frequency)

enable the power to the motor based on the

previous information. Otherwise the uP may is-

sue a Brake command, followed by the start-

up procedure after the motor has stopped spin-

ning.

Bra ke

W/M ask

Hol d & wa it

fo r d eci sio n

Tr i- sta te

W/M ask

Tr i-s tat e

W/Ma sk

R unB rk = 1

Ou tEn a = 0

RunBrk = 1

OutEna = 1

Out En a = 1

R unB rk = 0

Run

W/Mask

Ho ld fo r

” Al ign & G o”

Po wer

Re set

R unB rk = 0

Out En a = 0

Se qI nc = X

Run

Wo/ Mas k

Se qI nc = 0

Se qIn c = 1

SeqInc = 0

Seq Inc = 1

A cti on a cro ss

li ne in cre me nts

s equ enc er

A uto St art -up

E nable d

Di sable d

Run Br k = 1

OutE na = 0

Ru nBr k = 1

Out Ena = 1

Hold for

”A lig n & G o”

Sta rt

” Al ign & G o”

A lig n =

Seq ncr .

Alig

n =

o =

Fr om An ywh ere

Ho ld

fo r

”R esync”

St art

”R esync”

Re syn c = 1

Re lea se

mi n ma sk

Run

Au to /Ex t = 0

Stuc k

Rot or

( hol d)

et 2

d Z

c R

et=

OutE na = 1

Ru nBr k = 1

StrR tr = 0

R unB rk = 0

Out En a = 0

Figure 4: State Diagram

L6238

8/35

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