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200 9#a $n-% i' em'era ure%om'ensa ed & %ali ra edSilicon #ressure Sensors

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Te as Anstr ents an its s -si iaries (TAG reser e the ri ht to a/e chan es to their pro cts or to iscontin e an)pro ct or ser ice itho t notice an a ise c sto ers to o-tain the latest ersion o rele ant in or ation to eri )-e ore placin or ers that in or ation -ein relie on is c rrent an co plete, *ll pro cts are sol s -Sect to theter s an con itions o sale s pplie at the ti e o or er ac/no le ent incl in those pertainin to

arrant) patent in rin e ent an li itation o lia-ilit),TA arrants per or ance o its se icon ctor pro cts to the speci ications applica-le at the ti e o sale inaccor ance ith TAYs stan ar arrant), Testin an other . alit) control techni. es are tilize to the e tent TAee s necessar) to s pport this arrant), 9peci ic testin o all para eters o each e ice is not necessaril)per or e e cept those an ate -) o ern ent re. ire ents,

8 sto ers are responsi-le or their applications sin TA co ponents,

An or!er to %ini%ize ris/s associate! 'ith the c"sto%erYs applications a!e."ate !esi&n an! operatin&sa$e&"ar!s %"st -e pro i!e! -) the c"sto%er to %ini%ize inherent or proce!"ral hazar!s,

TA ass es no lia-ilit) or applications assistance or c sto er pro ct esi n, TA oes not arrant or representthat an) license either e press or i plie is rante n er an) patent ri ht cop)ri ht as/ or/ ri ht or otherintellect al propert) ri ht o TA co erin or relatin to an) co -ination achine or process in hich s chse icon ctor pro cts or ser ices i ht -e or are se , TAYs p -lication o in or ation re ar in an) thirpart)Ys pro cts or ser ices oes not constit te TAYs appro al arrant) or en orse ent thereo ,

8op)ri ht 2000 Te as Anstr ents Ancorporate


56/77

e-r ar) 200J

B1:ar is'la* ri4er

eneral escri' ionThe RMJ 34 is a %onolithic inte&rate! circ"it that sensesanalo olta e le els an ri es 30 R Ds pro i in a linearanalo ispla), * sin le pin chan es the ispla) ro a%o in& !ot to a -ar &raph, 8"rrent !ri e to the R Ds isre late an pro ra a-le eli inatin the nee or resistors, This $eat"re is one that allo's operation o$ the 'holes)ste ro less than J>,The circ it contains its o n a S sta-le re erence an accrate 30 step olta e i i er, The lo -ias c rrent inp t- er accepts si nals o n to ro n or > b )et nee s noprotection a ainst inp ts o J5> a-o e or -elo ro n , The-"$$er !ri es 30 in!i i!"al co%parators re$erence! to theprecision !i i!er, An!ication non#linearit) can th"s -e hel!

t)picall) to 3

2% e en o er a i e te perat re ran e,>ersatilit) as esi ne into the RMJ 34 so that controlleris al alar an e pan e scale nctions are easil) a eon to the ispla) s)ste , The circ it can ri e R Ds o an)colors or lo c rrent incan escent la ps, Man) RMJ 34scan -e Wchaine to or ispla)s o 20 to o er 300 seents, Both en s o the olta e i i er are e ternall) a aila-le so that 2 ri ers can -e a e into a zero center eter,The RMJ 34 is er) eas) to appl) as an analo eter circ it,

* 3,2> ll scale eter re. ires onl) 3 resistor an a sin leJ> to 35> s ppl) in a ition to the 30 ispla) R Ds, A the 3resistor is a pot it -eco es the R D -ri htness control, Thesi pli ie -loc/ ia ra ill strates this e tre el) si plee ternal circ itr),

=hen in the ot o e there is a s all a o nt o o erlap orW a e (a-o t 3 >G -et een se ents, This ass res that atno ti%e 'ill all R Ds -e W6 an! th"s an) a%-i&"o"sispla) is a oi e , >ario s no el ispla)s are possi-le,

I 2004 ational 9e icon ctor 8orporation D900H H0

M"ch o$ the !ispla) $le i-ilit) !eri es $ro% the $act that allo tp ts are in i i al D8 re late c rrents, >ario s e ectscan -e achie e! -) %o!"latin& these c"rrents, The in!i#i al o tp ts can ri e a transistor as ell as a R D at thesa e ti e so controller nctions incl in Wsta in controlcan -e per or e , The RMJ 34 can also act as a pro raer or se. encer,The RMJ 34 is rate! $or operation $ro% 0 8 to ;H0 8, TheRMJ 34 3 is a aila-le in an 37 lea ol e ( G pac/a e,The $ollo'in& t)pical application ill"strates a!S"stin& o$ there$erence to a !esire! al"e an! proper &ro"n!in& $or ac#c rate operation an a oi in oscillations,

Fea uresn Dri es R Ds R8Ds or ac l orescents n Bar orot ispla) o e e ternall) selecta-le -) ser npan a-le to ispla)s o 300 steps

n Anternal olta e re erence ro 3,2> to 32> n6perates ith sin le s ppl) o less than J> nAnp ts operate o n to ro nn 6 tp t c rrent pro ra a-le ro 2 * to J0 *n o ltiple s itchin or interaction -et een o tp tsn Anp t ithstan s [ J5> itho t a a e or alse o tp tsn R D ri er o tp ts are c rrent re late

open collectorsn 6 tp ts can inter ace ith TTR or 8M69 lo ic nThe internal 30 step i i er is loatin an can -e

re erence to a i e ran e o olta es

,national,co
http://www.national.com/http://www.national.com/


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58/77

solu e 1aEimum a in s ( ote 3G!G 1ili ar / eros'ace s'eciGied de4ices are reNuired,'lease con ac &e a ional Semiconduc or Sales $GGice/is ri u ors Gor a4aila ili and s'eciGica ions.

Po er Dissipation ( ote CGMol e DAP ( G 3JC5 =

9 ppl) >olta e 25>>olta e on 6 tp t Dri ers 25>Anp t 9i nal 6 er olta e ( ote 4G [ J5>Di i er >olta e b300 > to > ;

olta e B er an *n) 6ther8o parator

ain ( AR D +> A GAnp t Bias 8 rrent (at Pin 5GAnp t 9i nal 6 er olta e=$B - !=!

Di i er olta e

Rine olta e6 tp t Rea/a e ach 8ollector 6 tp t Rea/a e

S8 B? 89tan -) 9 ppl) 8 rrent(*ll 6 tp ts 6 G

ondi ions ( ote 2G

0> >


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60/77

'ical erGormance &arac eris icsSu''l urren 4s $'era in !n'u >ias

em'era ure urren 4s em'era ure

00H H002 00H H020

eGerence =ol a e 4s eGerence dQus inem'era ure urren 4s em'era ure

00H H023 00H H022

B urren - e ula ion B ri4er Sa ura ionro'ou =ol a e

00H H02J00H H024

5 ,national,co


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'ical erGormance &arac eris ics (8ontin e G

!n'u urren >e ond B urren 4sSi nal an e ( in 7) eGerence Boadin

00H H025

00H H02C

B ri4er urren o al i4ider esis ance

e ula ion 4s em'era ure

00H H02H00H H027

ommon-1ode Bimi s $u 'u &arac eris ics

00H H0J000H H02

,national,co C


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>loc9 ia ram (9ho in 9i plest *pplicationG

00H H00J

H ,national,co


63/77

Func ional escri' ionThe si pli e RMJ 34 -loc/ ia ra is to i e the enerali ea o the circ itYs operation, * hi h inp t i pe ance - eroperates ith si nals ro ro n to 32> an is protectea ainst re erse an o er olta e si nals, The si nal is thenapplie to a series o 30 co parators` each o hich is-iase to a i erent co parison le el -) the resistor strin ,An the e a ple ill strate the resistor strin is connecte tothe internal 3,25> re$erence olta&e, An this case $or each

325%> that the inp"t si&nal increases a co%parator 'ills'itch on another in!icatin& R D, This resistor !i i!er can-e connecte! -et'een an) 2 olta&es pro i!in& that the)are 3,5> -elo > ; an no less than > b, A an e pan e scaleeter ispla) is esire the total i i er olta e can -e aslittle as 200%>, pan!e!#scale %eter !ispla)s are %oreacc rate an the se ents li ht ni or l) onl) i -ar o e isse , *t 50 > or ore per step ot o e is sa-le,

! B =$B FThe re erence is esi ne to -e a S sta-le an e elops ano inal 3,25> -et een the < 6@T (pin HG an < *DV(pin 7G ter inals, The re erence olta e is i presse acrosspro&ra% resistor R D G,

1ode in Func ional escri' ionThis pin act all) per or s t o nctions, loc9 ia ram oG 1ode in escri' ion

00H H005

d?i h or -ar

$ $ > 1$ S B !$The olta e at pin is sense -) co parator 83 no inall)re erence to (> ; b 300 >G, The chip is in -ar o e henpin is a-o e this le el` other'ise itYs in !ot %o!e, Theco parator is esi ne so that pin can -e le t open circ it

or ot o e,Ta/in& into acco"nt co%parator &ain an! ariation in the300 > re erence le el pin sho l -e no ore than 20 >-elo > ; or -ar o e an ore than 200 > -elo > ; (oropen circ"itG $or !ot %o!e, An %ost applications pin iseither open ( ot o eG or tie to > ; (-ar o eG, An -ar o epin sho"l! -e connecte! !irectl) to pin J, Rar&e c"rrents!ra'n $ro% the po'er s"ppl) (R D c"rrent $or e a%pleGsho l not share this path so that lar e A< rops are a oi e ,
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64/77

1ode in Func ional escri' ion(8ontin e G

$ 1$ ?An or!er $or the !ispla) to %a/e sense 'hen %"ltipleRMJ 34s are casca!e! in !ot %o!e special circ"itr) has-een incl e to sh t o R D o, 30 o the irst e ice henR D o, 3 o the secon e ice co es on, The connectionor casca in in ot o e has alrea ) -een escri-e an isepicte -elo ,

*s lon as the inp t si nal olta e is -elo the threshol othe secon! RMJ 34 R D o, 33 is o$$, Pin o$ RMJ34o, 3 th"s sees e$$ecti el) an open circ"it so the chip is inot o e, *s soon as the inp t olta e reaches the threshol o R D o, 33 pin o RMJ 34 o, 3 is p lle an R Drop (3,5> or oreG -elo > R D , This con ition is sense -)co parator 82 re erence C00 > -elo > R D , This orcesthe o"tp"t o$ 82 lo' 'hich sh"ts o$$ o"tp"t transistor U2e tin ishin R D o, 30,> R D is sense ia the 20/ resistor connecte to pin 33, Theer) s%all c"rrent (less than 300 *G that is !i erte! $ro%R D o, oes not noticea-l) a ect its intensit),

*n a iliar) c rrent so rce at pin 3 /eeps at least 300 *$lo'in& thro"&h R D o, 33 e en i$ the inp"t olta&e riseshi h eno h to e tin ish the R D, This ens res that pin oRMJ 34 o, 3 is hel! lo' eno"&h to $orce R D o, 30 o$$hen an hi her R D is ill inate , =hile 300 * oes notnor all) pro ce si ni icant R D ill ination it a) -enoticea-le hen sin hi h e icienc) R Ds in a ar/ en iron%ent, A$ this is -otherso%e the si%ple c"re is to sh"ntR D o, 33 ith a 30/ resistor, The 3> A< rop is ore thanthe 00%> 'orst case re."ire! to hol! o$$ R D o, 30 )ets all eno h that R D o, 33 oes not con ct si ni icantl),

$ A =! A !S ! SThe RMJ 34 is relati el) lo po ere itsel an since an)n -er o R Ds can -e po ere ro a-o t J> it is a er)e$$icient !ispla) !ri er, T)pical stan!-) s"ppl) c"rrent (allR Ds 6 G is 3,C * (2,5 * a G, ?o e er an) re erenceloa!in& a!!s 4 ti%es that c"rrent !rain to the > ; (pin JGs ppl) inp t, or e a ple an RMJ 34 ith a 3 * re erencepin loa! (3,J/G 'o"l! s"ppl) al%ost 30%* to e er) RDhile ra in onl) 30 * ro its > ; pin s ppl), *t ll scalethe A8 is t)picall) ra in less than 30% o the c rrents pplie to the ispla),The ispla) ri er oes not ha e - ilt in h)steresis so thatthe ispla) oes not S p instantl) ro one R D to the ne t,@n er rapi l) chan in si nal con itions this c ts o nhi h re. enc) noise an o ten an anno)in lic/er, *n Wo erlap is -"ilt in so that at no ti%e -et'een se&%ents are allR Ds co%pletel) 6 in the !ot %o!e, enerall) 3 R D$a!es in 'hile the other $a!es o"t o er a %> or %ore o$ran&e ( ote JG, The chan&e %a) -e %"ch %ore rapi! -e#t een R D o, 30 o one e ice an R D o, 3 o a seconde ice Wchaine to the irst,The RMJ 34 eat res in i i all) c rrent re late R Dri er transistors, rther internal circ itr) etects hen an)ri er transistor oes into sat ration an pre ents othercirc itr) ro ra in e cess c rrent, This res lts in thea-ilit) o$ the RMJ 34 to !ri e an! re&"late R Ds po'ere!$ro% a p"lsatin& D8 po'er so"rce i,e, lar&el) "n$iltere!,(D"e to possi-le oscillations at lo' olta&es a no%inal -)#pass capacitor consistin o a 2,2 soli tantal connecte ro the p lsatin R D s ppl) to pin 2 o the RMJ 34is reco en e ,G This a-ilit) to operate ith lo or l ctatin olta es also allo s the ispla) ri er to inter ace ithlo ic circ itr) opto co ple soli state rela)s an loc rrent incan escent la ps,

ascadin B1:


65/77

'ical ''lica ions

Oero- en er 1e er, 60-Se men

00H H00H

,national,co 30


66/77

'ical ''lica ions (8ontin e G

E'anded Scale 1e er, o or >ar

00H H007

dThis application ill strates that the R D s ppl) nee s practicall) no ilterinali ra ionH =ith a precision eter -et een pins 4 an C a S st D o 3,20>, *ppl) 4, 4> to pin 5 an a S st


67/77


R Eclama ion oin is'la

00H H00

R Ds li ht p as ill strate ith the pper lit R D in icatin the act al inp t olta e, The ispla) appears to increase resol tion an pro i es an analoin ication o o erran e,

!ndica or and larm, Full-Scale &an es is'la Grom o o >ar

00H H030dThe inp t to the Dot Bar 9 itch a) -e ta/en ro catho es o other R Ds, Displa) ill chan e to -ar as soon as the R D so selecte -e ins to li ht,

,national,co 32


68/77


>ar is'la i & larm Flas&er

00H H033ll scale ca ses the ll -ar ispla) to lash, A the S nction o ar 1ode $nl )

00H H032

?)steresis is 0,5 > to 3 >

3J ,national,co


69/77


$'era in i & a Ai & =ol a e Su''l ( o 1ode $nl )

00H H03JThe R D c rrents are appro i atel) 30 * an the RMJ 34 o tp ts operate in sat ration or ini issipation,

dThis point is partiall) re late an ecreases in olta e ith te perat re, >olta e re. ire ents o the RMJ 34 also ecrease ith te perat re,

,national,co 34


70/77


60-Se men 1e er i & 1ode S i c&

00H H034dThe e act irin arran e ent o this sche atic sho s the nee or Mo e 9elect (pin G to sense the > ; olta e e actl) as it appears on pin J,

Pro ra s R Ds to 30 *

''lica ion Ain sThree o the ost co onl) nee e preca tions or sinthe RMJ 34 are sho n in the irst t)pical application ra insho in a 0> 5> -ar raph eter, The ost i ic lt pro-le occ rs hen lar e R D c rrents are -ein ra n especiall) in -ar &raph %o!e, These c"rrents $lo'in& o"t o$ thero n pin ca se olta e rops in e ternal irin an th serrors an oscillations, Brin in the ret rn ires ro si nalso rces re erence ro n an -otto o the resistor strin(as ill"strate!G to a sin&le point er) near pin 2 is the -estsol tion,Ron& 'ires $ro% > R D to R D ano!e co%%on can ca"seoscillations, Depen!in& on the se erit) o$ the pro-le%0,05 to 2,2 eco plin capacitors ro R D ano eco%%on to pin 2 'ill !a%p the circ"it, A$ R D ano!e lineirin is inaccessi-le o ten si ilar eco plin ro pin 3 topin 2 ill -e s icient,A R D t rn 6 see s slo (-ar o eG or se eral R Ds li ht( ot o eG oscillation or e cessi e noise is s all) thepro-le , An cases here proper irin an -)passin ail tostop oscillations > ; olta&e at pin J is "s"all) -elo' s"este li its, pan e scale eter applications a) ha eone or -oth en s o the internal olta e i i er ter inate at

35

relati el) hi h al e resistors, These hi h i pe ance en ssho l -e -)passe to pin 2 ith at least a 0,003 capacitor or p to 0,3 in nois) en iron ents,Po'er !issipation especiall) in -ar %o!e sho"l! -e &i enconsi eration, or e a ple ith a 5> s ppl) an all R Dspro ra e to 20 * the ri er ill issipate o er C00 =,An this case a H,5 resistor in series ith the R D s ppl) illc"t !e ice heatin& in hal$, The ne&ati e en! o$ the resistorsho l -e -)passe ith a 2,2 soli tantal capacitor topin 2 o the RMJ 34,T"rnin& 6 o$ %ost o$ the internal c"rrent so"rces is ac#co%plishe! -) p"llin& positi e on the re$erence 'ith a c"r#rent so rce or resistance s ppl)in 300 * or so, *lternatel)the inp t si nal can -e ate 6 ith a transistor s itch,6ther special $eat"res an! applications characteristics 'ill-e ill strate in the ollo in applications sche atics, otesha e -een a!!e! in %an) cases atte%ptin& to co er an)special proce res or n s al characteristics o these applications, * special section calle! W*pplication Tips $or theRMJ 34 * S sta-le


71/77

''lica ion Ain s (8ontin e GB! !$ ! S F$ A B1:B

F

rea l E'anded Scale (>ar 1ode $nl )Placin the RMJ 34 internal resistor i i er in parallel ith asection (,2J0 G o$ a sta-le lo' resistance !i i!er &reatl)re ces olta e chan es e to A8 resistor al e chan esith te perat re, >olta e > 3 sho l -e tri e to 3,3> irst-) se o 2 across the A8 i i er strincan -e a S ste to 200 > sin 3,R D c rrent ill -e appro i atel) 30 *,

on-!n erac in dQus men s For E'anded Scale1e er (5.7= o 7=, >ar or o 1ode)This arran&e%ent allo's in!epen!ent a!S"st%ent o$ R D-ri htness re ar less o eter span an zero a S st ents,irst > 3 is a S ste to 5> sin


72/77

''lica ion Ain s (8ontin e G

on-!n erac in dQus men s Gor E'anded Scale 1e er (5.7= o 7=, >ar or o 1ode)

00H H03C

dQus in Bineari oG Se4eral S ac9ed i4iders

00H H03H

$ &er ''lica ions1 W9lo N a e -ar or ot ispla) ( o -les resol tionG1 20 step eter ith sin le pot -ri htness control1 30 step (or ltiplesG pro ra er 1 M lti step or Wsta in controller 1 8o -ine controller an process e iation eter 1Direction an rate in icator (to a to D>MsG 1 cla ation point ispla) or po er sa in

3H

1 ra!"ations can -e a!!e! to !ot !ispla)s, Di%l) li&hte er) other R D sin a resistor to ro n

1 lectronic W eter rela) N ispla) co l -e circle or se icircle

1 Mo in Whole ispla) N in icator R D is ar/ rest o -arlit

1 Dri es ac l orescent an R8Ds sin a e passi e parts

,national,co


73/77

onnec ion ia ramslas ic &i' arrier ac9a e

00H H037

o' =ie$rder um er B1:


74/77

B1:ar is'la ri4er

00H H0J5

ie Ba ou ( - S e')

ie/LaGer &arac eris icsFa rica ion ri u es eneral ie !nGorma ion

Ph)sical Die A enti ication J 34 Bon Pa 6penin 9ize ( inG 4 305Die 9tep D Bon Pa Metalization *R@MA @M

& sical ri u es Passi ation >6M AT


75/77


76/77

& sical imensions inches ( illi etersGnless other ise note

o eH @nless other ise speci ie ,

3, 9tan ar Rea inishQ

200 icroinches +5,07 icro eter ini

lea +tin JH+CJ or 35+75 on allo) 42 or e. i alent or copper

2, ariation *8 ate Ma) 3 J,

ual-!n-Bine ac9a e ( )$rder um er B1:


77/77

& sical imensions inches ( illi etersG nless other ise note (8ontin e G

ual-!n-Bine ac9a e ( )$rder um er B1:u da e 26/60/

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