ss1 4 38 unipolar hall switch 1 v 3.1 0 nov 1 , 20 1 3 f eat u r es a n d b e n ef i ts ? w i de ope r at i ng v o l t age r a nge f r om 2.5v to 24v ? medium sensitivity ? cm o s t e c hno l ogy ? cho ppe r - s tab ili z ed a m p li f i e r s tage ? superior temperature stability ? extremely low switchpoint dr ift ? insensitive to physical stress ? l ow c u rr ent c on s um pt i on ? o pen d r a i n ou t pu t ? ti ny s o t 23 3l or f l at sip 3l b oth ro h s co m pl i ant pa ck ages application examples ? a uto m ot i ve, c on s um er and indu s t ri al ? s o l i d - s ta t e s w i t c h ? interrupter ? s pe ed d ete c t i on ? l i n ear p os i t i on dete c t i on ? a ngul ar pos i t i on d ete c t i on ? p r o xi m i t y d e te c t i on 3 pin sot23 (suffix so) 3 pin sip (suffix ua) functional block diagram v dd out voltage regulat o r chopper hall plate gnd sip package so t package pin 1 ? v dd pin 1 ? v dd pin 2 ? gnd pin 2 ? out pin 3 ? out pin 3 ? gnd
ss1 4 38 unipolar hall switch 2 v 3.1 0 nov 1 , 20 1 3 general d e scription the ss1438 is a uni polar hall effect sensor ic fa b- ricated from mixed signal cmos technology. the de v i c e i n teg r a t es a vo l ta g e r e gu l ato r , h a l l s en s or w i th d y na m i c of f s et c an c e l l a t i on s y s te m , s c h m i tt t r i gger and a n ope n - d r a i n out put d ri ve r , a l l i n a s i n- g l e pa c k age. it incorporates advanced chopper stabilization tec h- niques to provide accurate and stable magnetic switch points. there are many applications for this hed ? hall electronic device - in addition to those listed abov e. thanks to its wide operating voltage range and extended choice of temperature range, it is quite suitable for use in automotive, industrial and consumer applications. the device is delivered in a small outline transi s- tor (sot) for surface mount process or in a plastic single in line ( sip flat) for through - hole mount. both 3 - lead packages are rohs compliant. glossary of terms millitesla (mt) , gauss units of magnetic flux density: 1mt = 10 gauss rohs restriction of hazardous substances operating point (b op ) magnetic flux density applied on the branded side of the package which turns the output driver on (v out = v dson ) release point (b rp ) magnetic flux density applied on the branded side of the package which turns the output driver off (v out = high)
ss1 4 38 unipolar hall switch 3 v 3.1 0 nov 1 , 20 1 3 pin s definition and description unique features b a s ed on m i x ed s i gn a l c m o s te c hnol o g y , ss1438 i s a ha l l - e ff e c t de v i c e w i th h i gh m agne t i c s en s i t i v i t y . t h i s m ul t i - pur pos e l at c h meets m os t of the a ppl i c at i on r e q u i r e m ent s . t he c hoppe r - s ta bi liz ed a m p li f i er us es s w i t c he d c a p a ci tor te c hn i q ue t o s upp r e s s t he off s et gene r a l l y ob s e rv e d w i th ha l l s en s o r s a nd a m p li f i e rs . t he cm o s te c hnol ogy m a k es th i s a dv an c e d te c hni que po ss i bl e and c ont r i bu tes to s m a ller c h i p si z e and l o wer c u rr ent c on s um pt i on th a n bi pol ar t e c hnol ogy . t he s m a l l c h i p si z e i s a l s o a n i m po r tant f a c tor t o m i n i m iz e t h e e ff e c t of p hy sic al s t r e ss . t h i s c om bi nat i on r e s u l ts i n m or e s tab l e m agnet i c c ha r a c te r i s t i c s a nd e na bl es f a s ter and m o r e p r e c i s e de si gn . t he w i de ope r a t i n g vol ta ge f r o m 2.5v to 2 4v , l ow c u r r ent c on s um pt i on a nd l a r ge c ho i c e of o pe r a t i ng te m pe r a- tu r e r an ge a cc o r di ng to ? l ? , ? k ? a nd ? e ? s p e c i f i c at i on s m a k e th i s de v i c e s u i tab l e f or auto m ot i v e, i ndu s t r i a l a nd c ons u m er a pp li c a t i on s . absolute maximum ratings p ar am eter s y m b ol v al ue un i ts s upply v oltage v dd 28 v s upply cu rr ent i dd 50 m a output v o ltage v o ut 28 v output cu rr ent i o ut 50 m a s to r age t e m pe r atu r e range t s - 50 to 150 c m axi m um junction t e m pe r atu r e t j 165 c sot p i n sip pi n na m e t y pe f un c t i o n 1 1 v dd s upply s upply v oltage pin 2 3 out output open d r ain output pin 3 2 gnd g r ound g r ound pin
ss1 4 38 unipolar hall switch 4 v 3.1 0 nov 1 , 20 1 3 o pe r at i ng t e m pe r atu r e r a nge s y m b o l v al ue un i ts t e m pe r atu r e s uffix ? e ? t a - 40 to 85 c t e m pe r atu r e s uffix ? k ? t a - 40 to 125 c t e m pe r atu r e s uffix ? l ? t a - 40 to 150 c e xc eed i ng t he ab s o l ute m a x i m u m r at i ngs m a y c a us e pe r m anent da m age. e xpo s ur e to ab s o l ute - m a xi m u m - r ated c o ndi t i o ns f or e x- ten ded pe r i o ds m a y a ff e c t de v i c e r e l i a bi l i t y . general electrical specifications dc o pe r a t i ng p a r a m ete r s t a = 25c , v dd = 2. 5v to 2 4v ( un l e s s ot he r w i s e s p e c i f i ed) p ar am eter s y m b o l t e s t cond i t i ons m i n t y p max un i ts s upply v oltage v dd ope r ating 2.2 24 v s upply cu rr ent i dd b < b rp 5 m a output s atu r ation v o ltage v d so n i o ut = 20 m a , b > b op 0.5 v output leakage cu rr ent i o ff b < b rp v o ut = 24v 1 10 a output rise t i m e t r r l = 1k ? , c l = 20pf 0.25 s output f all t i m e t f r l = 1k ? , c l = 20pf 0.25 s m axi m um s witc h ing fr equency f s w --- 10 k hz p ackage t he rm al resista n ce r th s ingle layer ( 1s ) jed e c boa r d 301 c/w note: the output of ss1438 will be switched after the supply voltage is over 2.2v, but the magnetic characteristics won't be normal until the supply is over 2.5v. magnetic specifications dc operating parameters v dd = 2 . 5 to 24v (unless otherwise specified) package parameter symbol test conditions min typ max units ua operating point b op t a =25c,v dd =12v dc - 12 0 - 70 g release point b rp - 10 0 - 20 g hysteresis b hyst 40 g so operating point b op t a =25c,v dd =12v dc 90 110 g release point b rp 40 80 g hysteresis b hyst 40 g
ss1 4 38 unipolar hall switch 5 v 3.1 0 nov 1 , 20 1 3 output behavior versus magnetic pole dc operating parameters ta = - 40c to 150 c , vdd = 2. 5 to 24v (unless otherwise specified) test conditions (ua) test conditions (so) out b > b rp b < b rp high b < b op b > b op low the sot - 23 device is reversed from the ua pack age. the sot - 23 output transistor will be turned on (drops low) in the presence of a sufficiently strong sou th pole magnetic field applied to the marked face. application information it is strongly recommended that an external bypass capacitor be connected (in close proximity to the hall sensor) between the supply(v dd pin) and ground(gnd pin) of the device to reduce both external noise and noise gene r- ated by the chopper stabilization technique. as is shown in the following figur e, a 0.1f capacitor is typical. f or r e ve rs e vo l t a ge p r ote c t i on, i t i s r e c o m m ended t o c onne c t a r e s i s tor or a d i ode i n s e ri es w i t h t he v dd p i n. w h en u s i ng a r e s i s to r , t h r e e po i nts a r e i m po r tant: - the r e s i s tor has to li m i t t h e r e v e rs e c u rr ent t o 50 m a m a xi m um ( v cc / r1 50 m a ) - the r e s u l t i ng de v i c e s uppl y vo l ta g e v d d has t o be h i g her th a n v dd m i n ( v dd = v c c ? r1 * i dd ) - the r e s i s tor has to w i t hs t a nd t h e po w er d i ssi p a ted i n r e v e rs e vo l t a ge c ond i t i on ( p d = v cc 2 / r1 ) w h en u s i ng a d i ode, a r e ve rs e c u rr ent c an not f l ow and the vo l t a ge d r op i s a l m o s t c on s tant ( 0.7v ) . t he r e f o r e, a 100? / 0.25 w r e s i s tor f or 5v a pp li c a t i on a nd a d i ode f or h i gher s uppl y vol ta ge a r e r e c o m m end e d. typical three - wire application circuit w h en a w eak po w er s upp l y i s u s ed or w h en t he de v i c e i s i n te n ded to be u s e d i n no i s y e nvi r onm ent, i t i s r e c omm ended t h at following f i gu r e i s u s e d.
ss1 4 38 unipolar hall switch 6 v 3.1 0 nov 1 , 20 1 3 automotive and severe environment protection circuit t he l o w - pa s s f il ter f o r m ed b y r 1 a nd c 1 a n d t he z e ne r d i ode z 1 b y p a s s the d i s tu r ban c es or v ol ta g e s p i k es o cc u rri ng on t he de v i c e s upp l y vo l t age v d d . t he d i ode d1 p r ov i des a dd i t i on a l r e ve rs e vo l ta g e p r ot e c t i on. b oth s o l ut i ons p r ov i de t he r eq u i r ed r e v e rs e vol t a ge p r o te c t i on. esd precautions ele c t r o n i c s e m i c ondu c tor pr odu c ts a r e s en s i t i v e to e l e c t r o s ta t i c d i sc ha r ge (e s d ). a l w a y s obs e rv e e l e c t r o s t a t i c d i sc ha r ge c ont r o l p r o c e dur es w h en e v er h a n d l i ng s e m i c ondu c tor p r o duc t s .
ss1 4 38 unipolar hall switch 7 v 3.1 0 nov 1 , 20 1 3 package information package ua, 3 - pin sip( to - 92): 4.0 0.01 1 2 3 1.27 2.13 1.87 1.00 1.20 45 1 1.52 0.1 3 1 0.75 0.05 3.0 0.01 0.44 0.01 0.05 0.05 1.6. 0.1 0.84(nom) 3 1 6 1 6 1 3 1 14 .5 1 active area depth: sensor location 1 2 3 notes: 1). controlling dimension : mm ; 2). le a ds must be free of flash and plating voids ; 3). do not bend leads within 1 mm of lead to package interface ; 4). pinout: pin 1 v dd pin 2 gnd pin 3 output 0.39 0.01 0.38 0.01 2.54
ss1 4 38 unipolar hall switch 8 v 3.1 0 nov 1 , 20 1 3 package so , 3- pin (sot - 23) : hall plate location ordering information part no. pb - free temperature code package code packing ss1438 esot yes - 40c to 85c sot - 23 7- in. reel, 3000 pieces/reel ss1438 eua yes - 40c to 85c to - 92 bulk, 1000 pieces/bag ss1438 k sot yes - 40c to 12 5c sot - 23 7- in. reel, 3000 pieces/reel ss1438 ku a yes - 40c to 12 5c to - 92 bulk, 1000 pieces/bag ss1438 lsot yes - 40c to 150c sot - 23 7- in. reel, 3000 pieces/reel ss1438 lua yes - 40c to 150c to - 92 bulk, 1000 pieces/bag 0.56 0.66 0.95 0.80 1.50 1.40 chip 3 2 1 bottom view of sot - 23 package 2.70 3.10 1.00 1.30 0.70 0.90 0.00 0.10 0.35 0.50 0.10 0.25 0.20 m in 2.60 3.00 1.50 1.8 0 1.70 2.10 3 2 1 top side vie end notes 1). pinout: pin 1 v dd pin 2 output pin 3 gnd 2). all dimensions are in millimeters;
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