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Samsung SGH-P408 Service Manual page 8

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SG H- P408 Circuit Description
4 . V i b r at o r M o t o r D i r v e r
T h e v i b r a t o r m o t o r d r i v e r i s a l o w - s i d e , p r o g r am m ab l e v o l t ag e s o u r c e
d e s i g n e d t o d r i v e a s m al l d c m o t o r t h at s i l e n t l y al e r t s t h e u s e r o f an
i n c o m i n g c al l . T h e d r i v e r i s e n ab l e d b y E N _V I B , an d i t s v o l t ag e s e t t i n g i s
d e t e r m i n e d b y V I B [ 0 : 2 ] . P r o v i d e d E N _V I B i s a l o g i c 1 , t h e d r i v e r c an b e
p r o g r am m e d t o m ai n t ai n a m o t o r v o l t a g e o f 1 .1 V t o 2 .5 V i n 2 0 m V s t e p s an d
w h i l e s i n k i n g u p t o 1 0 0 m A . F o r e f f i c i e n t u s e , t h e v i b r at o r m o t o r s h o u l d b e
c o n n e c t e d b e t w e e n t h e m ai n b at t e r y an d t h e V I B _D RV o u t p u t .
2 ) C o n n e c t o r
1 . L C D C o n n e c t o r
L C D i s c o n s i s t e d o f m ai n L C D ( c o l o r 6 5 K ST N L C D ) a n d s m al l L C D ( 4 - g r ay
L C D ) . C h i p s e l e c t s i g n al s o f E M I p ar t i n t h e t r i d e n t , C L C D _E N _F O an d
G L C D _E N _F O,
c an e n a b l e E ac h L C D . L E D _E N _F O s i g n al e n ab l e s w h i t e L E D o f m ai n L C D
a n d E L _E N _F O s i g n al e n ab l e s E L o f s m al l L C D .
T h e s e t w o s i g n al s ar e f r o m I O p ar t o f t h e D SP i n t h e t r i d e n t . RST s i g n al
f r o m 2 0 0 6 i n i t i at e s t h e i n i t i al p r o c e s s o f t h e L C D .
1 6 - b i t d at a l i n e s ( D ( 0 ) _F O ~ D ( 1 5 ) _F O ) t r an s f e r s d at a an d c o m m a n d s t o L C D
t h r o u g h e m i _f i l t e r . D at a a n d c o m m an d s u s e A ( 2 ) _F O s i g n al . I f t h i s s i g n al i s
h i g h , I n p u t s t o L C D a r e c o m m a n d s . I f i t i s l o w , I n p u t s t o L C D ar e d at a. T h e
s i g n al w h i c h i n f o r m s t h e i n p u t o r o u t p u t s t a t e t o L C D , i s r e q u i r e d . B u t t h i s
s y s t e m i s n o t n e c e s s ar y t h i s s i g n al . So C P _W E N _F O s i g n al i s u s e d t o w r i t e
d at a o r c o m m an d s t o L C D .
P o w e r s i g n a l s f o r L C D ar e V _b a t a n d V _c c d .
SP K 1 P an d SP K 1 N f r o m C SP 1 0 9 3 ar e u s e d f o r au d i o s p e ak e r . A n d
V I B _E N _F O f r o m e n ab l e s t h e m o t o r .
2 . JT A G C o n n e c t o r
T r i d e n t h as t w o JT A G p o r t s w h i c h ar e f o r A RM c o r e an d D SP
c o r e ( D SP 1 6 0 0 0 ) . So t h i s s y s t e m h as t w o p o r t c o n n e c t o r f o r t h e s e p o r t s .
P i n s ' i n i t i al s f o r A RM c o r e ar e ' C P _' an d p i n s ' i n i t i al s f o r D SP c o r e a r e
' D SP _' .
C P _T D I a n d D SP _T D I s i g n al ar e u s e d f o r i n p u t o f d at a. C P _T D O an d
D SP _T D O s i g n al s a r e u s e d f o r t h e o u t p u t o f t h e d at a. C P _T C K an d
D SP _T C K s i g n al s ar e u s e d f o r c l o c k b e c au s e JT A G c o m m u n i c at i o n i s a
s y n c h r o n o u s . C P _T M S an d D SP _T M S s i g n al s a r e t e s t m o d e s i g n al s . T h e
d i f f e r e n c e b e t w e e n t h e s e i s t h e RE SE T _I N T s i g n al w h i c h i s f o r A RM c o r e
RE SE T .
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