View MLX16305_8049952.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MLX16305 interlock switch sensor interface ic features and benefits ? 6 sense ch annels ? large supply current + supply voltage range for maxi mum c ontact clean ing ? applicable with all 2-wir e hall effect switches ? diagnoses o pen wires, shorts to supplies and sh orts between wires o current and voltage measurement mode o high measurement accuracy: 5% ? current limited supply regulator ? automotive qualified (40 v load dump) ? over-te m pe rature detection ? small package: narrow body (150mil s) so16, ro hs compliant applications ? general fail safe read o u t of safety interlock swit ches to o detect human action o verify solenoid/motor actuation ? automotive application s o next to the safety ecu: interlock switch sen s or supply and sensor i/f ? seat belt bu ckle ? seat occupa ncy mat ? air bag presence detection ? seat positio n switch ? airbag disab l e switch o next to sma r t junction b o x / body control module: contact monitoring ? foot brake pressed det ection ? park positio n of the auto m atic transmission ? door lock p o sition ? ? o analog mux ? resistive co ded rotary encoder ? fuel run dry switch ? seat heater switch ? ? ? industrial ap plication s : o industrial se curity doors and machine guarding o general 2 wire analog sensors : ? industrial p r essure, str a in gauge, ? sensors (ref. mlx 90308 , ml x 90314) ordering information part no. tempe r atu r e suffix package cod e mlx163 05 e (-40 c to 9 0 c) dc (s oic1 6 150mil ) 3901 0163 05 page 1 of 29 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 1. overview application schematic m l x16305 m i cr oco n t r ol l e r en abl e vi _ c trl me a s _ o u t rr e f s ens e1 s ens e2 s ens e3 s ens e4 s ens e5 s ens e6 vsu p ad c m u x _ se n s e3 m u x _ se n s e2 m u x _ se n s e1 78l05 vdd gnd gnd vsu p vr e f s eat o c c upant r e s i s t i v e and 2- w i r e h a l l r e s i s t i v e r o t a r y e n c oder sw i t c h t o vb at i n t e r l oc k sw i t c hes rr e f (r s 2 ) (r s 3 ) rs 6 re n c re nc re nc re n c vb at vb at s w itc h to g n d (r p 2 ) 2. description the mlx1 63 05 is d e si gn ed to diag no se the state of remote i n terlo ck switche s in a u to motive safety appli c ation s . its high accura cy allows it to be applied in a broad ra nge of related auto m otive and indu strial ap p lication s u s in g curre n t modulated sen s ors a nd switches. the m l x16 3 05 in clu d e s a cu rrent-limite d regulate d s upply that i s applie d to on e chan nel (switch/ sen s o r) at a time. the sup p lied cu rre nt or the re sulting sup p ly voltage are measured an d pre s e n ted as an anal og voltage to the micro c o n troll e r for inte rpre tation. each mlx16 305 allo ws scan ning up to 6 switch es for ch ang es in swit ch st ate, and for any type o f sho r t/open ci rcuit fail ure mode. t h e ran ge of switch es ca n easily be e x tended by addin g othe r mlx163 05 d e vice s in parallel on the same micro c o n trolle r adc i nput. the hig h current and volta ge ra nge allo w maximum cont a c t cl ean ing ene rgy fo r re si stive switche s . the high a c cura cy allows mo ni toring of co ntact agei ng an d early failure s dete c tion. 3901 0163 05 page 2 of 29 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic tabl e of content s features and be nefi ts .......................................................................................................... ............. 1 applicat ions ................................................................................................................... ......................... 1 ordering in formation ........................................................................................................... .............. 1 1. overview applicatio n schematic ......................................................................................... 1-2 2. description .................................................................................................................... ................ 2-2 3. absolute maximu m ratings ....................................................................................................... 4 4. MLX16305 elect r ical specificat ions ...................................................................................... 4 5. pin assi gnment ................................................................................................................. ............... 5 6. block di agram .................................................................................................................. .............. 6 7. general des cription ............................................................................................................ ........ 7 8. pin descri ption ................................................................................................................ ................ 7 8. 1. s upply r ang e (vsu p)......................................................................................................................... ........ 7 8. 2. i nput v ol tag e r ef e r en ce ( v ref) ............................................................................................................ 7 8. 3. v oltag e r e g ulat ion (sen se) .................................................................................................................. 8 8. 4. o utput vol t age to th e m i crocontro ll er adc (mea s_out ) ............................................................ 8 8. 5. d igita l i npu t s ............................................................................................................................... .............. 9 8. 6. encoder: i n terna l d ig it al s ig nal s ................................................................................................... 10 9. voltage mode (vm) .............................................................................................................. ......... 13 10. current mo de (cm) .............................................................................................................. ......... 14 10 .1 . c urrent to v olta ge conv ersion pri n ci ple .......................................................................................... 14 10 .2 . t he ac tua l m e asur em ent ....................................................................................................................... 14 10 .3 . h ow t o do an offs et curr e n t meas ure m ent ........................................................................................ 15 10 .4 . m easur e m e n t e rrors .............................................................................................................................. 1 6 11. how to predict the syst em operati n g zone .................................................................... 17 11 .1 . vm ea s o u t lim i ts ............................................................................................................................... ...... 17 11 .2 . i sense li mi ts ............................................................................................................................... .............. 17 12. overcurrent limitation ......................................................................................................... ... 18 13. overtemp erature detection .................................................................................................. 19 13 .1 . o vertem pera ture c onsi d e r atio ns ........................................................................................................ 20 14. diagnosti c s .................................................................................................................... ................ 21 14 .1 . s horts ............................................................................................................................... ......................... 21 14 .2 . o pen w ire ............................................................................................................................... ................... 21 14 .3 . d iagnost i cs f l o w ............................................................................................................................... ...... 22 15. multiplexing the adc input by se tting meas_out high impedant ............................ 23 16. applicatio n notes .............................................................................................................. ......... 24 16 .1 . s yste m d e fin i tion ex amp l e wi th 2- wir e h all s wi tc h e s ..................................................................... 24 16 .2 . r esis tiv e s wi tc hes ............................................................................................................................... .... 25 16 .3 . 2- wire an alo g sen s ors ............................................................................................................................ 25 16 .4 . g round s hif t ............................................................................................................................... ............. 26 17. sta nda rd in for m ation r e gar d in g manu fa c t ur ab ility of melexis pr od uc ts with diffe rent so ldering processes ........................................................................................ 27 18. esd precautions ................................................................................................................ ........... 27 19. package info rmation ............................................................................................................ ..... 28 20. disclaimer ..................................................................................................................... .................. 29 3901 0163 05 page 3 of 29 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 3. absolute m aximum ratings supply voltage, vsup (overvoltage) 40v supply voltage, vsup (operatin g) 25v supply current, i dd 6 m a output current, sense 90 ma storage temperature range, t s -40 c .. +150 c esd sensitivity ( aec q100 002) 1.5 kv exceedin g the absolute m a ximum ratin g s may caus e perm ane nt damag e. exposure to ab solute- maximum-rat ed co ndition s for extended perio ds m a y affect device reliability. 4. m l x16305 electrical specifications dc o per ating paramete rs tj = -40 o c to 90 o c, vsup = 8v to 25v (unle s s othe rwise sp ecifie d) s y m b o l p a r a m e t e r conditi o n s m i n n o m m a x u n i t v s u p s u p p l y 8 2 5 v isense sense output cu rrent vsup-vref 2.5 v , vref < 7v 1 30 ma v s u p - v r e f 3.5 v , vref < 7v 1 40 ma v s u p - v r e f 8v, vref < 8.25v 1 45 ma v r e f a n a l o g i n p u t 3 8 . 2 5 v r r e f 1 k o h m i d d c u r r e n t consum p t i o n v c c = 2 5 v , no channel sele cted 6 m a ivref current consum ption on vref vref = 5v no current limitation condition 0 . 5 m a digital i n p u ts v il input low voltag e -0.3 0.75 v v ih input high voltag e 1.9 5 v i n p u t p u l l - d o w n 3 0 1 0 0 2 2 0 k ? measou t o u t p ut vmeas output voltage range 0.05 vref+0.5 v i m e a s c u r r e n t c a p a b i l i t y 3 0 0 u a vmeas_dis output voltage in vm with voltag e regulator disabled enable = 0, vi_ctrl=0 (vm) 0 . 0 5 0 . 2 v rsense_pd sense pin pull- down 30 100 220 k ? meas_verr1 error in voltage mode 3v< vsense < 8. 25v 5 % meas_verr2 error in voltage mode 1v< vsense < 3 v 20 % vmeas_voffset offset erro r in voltage mode 1v< vsense < 8. 25v 25 mv % m ea s_ierr1 error in cu rrent mode 5ma< isense <40ma -5 % 5 % imeas_err2 error in cu rrent mode 0ma< isense <5ma -25 25 ua ioffset forced offset cu rrent enable = 0, vi_ctrl=1 (cm ) 0 . 0 5 5 1 m a 3901 0163 05 page 4 of 29 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic s y m b o l p a r a m e t e r conditi o n s m i n n o m m a x u n i t voltage re gula t ion on sense pins v s e n s e _ e r r 1 v sense ? v re f 3v d vref d 5v - 1 0 0 1 0 0 m v v s e n s e _ e r r 2 v sense ? v re f 5v d vref d 8.25 v - 1 5 0 1 5 0 m v c sense maximum capacitive load on sense pins 1 5 0 n f miscellaneous t ri se sense rising ti me vref=5v from enable=1 to v(sense) = [4.9, 5.1]v 0 1 5 0 2 5 0 u s t shut dow n thermal shutdo wn (junction) 120 150 q c vmeas_oth measout voltage for overtemperatu r e condition 1 . 9 v vmeas_otl measout voltage without overtemperatu r e condition 0 . 9 v isense li m current limitation level on sense pins. rref=1k ohm, vref=5v 40 80 ma 5. pin assignment pin no. shor t na me descripti o n fun c ti on 1 sense3 5v / 40ma driver output 2 sense2 5v / 40ma driver output 3 sense1 5v / 40ma driver output 4 vsup range: 8v .. 25v supply 5 enable ttl levels digital input 6 mux_sense0 ttl levels digital input 7 mux_sense1 ttl levels digital input 8 mux_sense2 ttl levels digital input 9 vref external voltage reference analog input 10 vi_ctrl ttl levels digital input 1 1 m e a s _ o u t a n a l o g o u t p u t 1 2 r r e f a n a l o g o u t p u t 13 vss ground (analog + digital) ground 14 sense6 5v / 40ma driver output 15 sense5 5v / 40ma driver output 16 sense4 5v / 40ma driver output 3901 0163 05 page 5 of 29 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 6. block diagram rre f v meas( c m ) v meas ( v m) se n s e 1 se n s e 2 se n s e 3 se n s e 4 se n s e 5 se n s e 6 *0. 5 mux _ su p[ 0 : 2 ] mux _ su p[ 0 : 2 ] encoder ov er t e m p z vi_ctrl meas_out mu x_ se n s e [ 0: 2] en able vre f vs u p vd d gnd mu x_ su p[ 0 : 2 ] mu x_ s u p[ 0 : 2 ] *0. 9 mux_ sen se[ 0 : 2 ] v sen se (i se n s e ) i sen se /10 i of f s e t vo lt ag e regu la to r 3901 0163 05 page 6 of 29 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 7. general description the mlx 163 05 si mplifies the monito rin g and diag no stic s of up to 6 me chani cal swit che s th rough volta ge and current sensi ng. t he 6 sense inputs are m u ltip lexed onto a single output pin (meas_out). t he sense pins can b e su p p lied by a voltage sou r ce that force s the vref voltage with a curre n t limit (isen s e lim ). the mlx1 63 05 is co ntroll ed by the mi cro c o n troll e r thr oug h a 5 wire digital in terface. t h is allows th e microcontroll er to eith er a pply a voltag e to maximu m 1 sense pin, or l eave them hig h im peda nt. at the same time th e micro c o n troller ca n eva l uate the current d r a w n o r the volta g e mea s u r ed o n eithe r that same pi n or a n y other sense pin. this way the state of a mechani cal switch ca n be rea d or t he switch es can b e diag n o se d to detect open wires, sho r ts bet we en sense pins, to gro und or to supply. with the vi_ctrl input the mlx16 3 0 5 can b e set i n either curre n t mode (cm) or in voltage mode (vm ) ? in current measurem e nt mode (cm) , the current dra w n b y the select ed sense pin (isen s e ) fro m the voltage sou r ce is co pied onto an external resi stor rref to convert it to a proportional voltage presen ted on the m eas_out pi n. ? in v o ltage measurem e nt mode (v m) the volta ge on th e se lected se nse pin is copi ed directly onto t he meas_out pi n divided by two, such as to com e within the voltage rail set by vref. the combi nat ion of voltag e and cu rr ent measurement s allo w diagn osin g mu lti-l e vel cu rre nts t o dete c t the state of the switch, whilst allowin g to ch ec k sh ort s to gnd and to supply failure modes. 8. pin desc ription 8.1. supply range (vsup) for corre c t o peratio n of the voltage source, a mini mum voltage drop i s re qu ired b e twe e n the sup p ly (vsup) and t he referen c e voltage (v ref). the r efo r e t he mai n sup p ly vsup of the ic device is sp ecifie d as : ? v supmin = v ref + 2.5v for isen se 30 ma v ref + 3.5v for isen se 40 ma v ref + 8v for is ens e 45 ma ? v supma x = 25v the su pply current idd i s spe c ified for disa bled sense pins (m ux_sense=0 00b: the voltage reg u lato r is disable d ), and re presen ts the cu rre nt dra w n from v s up. in case a sense pin is pu lling cu rrent, the total curre n t con s umpti on is the ad di tion of: ? the internal current throu g h the device (same a s idd) ? the curre n t drawn by the sense pin (i sense ) from the voltage reg u l a tor ? the 10:1 mirror cu rrent of i sense on the rref pi n 8.2. input voltage reference (vref) the vref pi n is used as an external referen c e fo r voltage regu lation on the sense pins. vref also defines the cl amping l e vel of the meas_out pin. t h is reference voltage is ge nerated externally and can vary indepe n dent of vsup and digital input levels. in a typical example with 5v micro c o n trolle rs an d 5 v hall switche s vref is dire ctl y tak en from the external 5 v regulato r . rema rk that even tho ugh the hall swit ches a r e su pp lied at v r ef, the lo ad on vref i s limit ed to iv ref. the re gulato r that supplie s the halls i s d r awi ng its current from vs up. 3901 0163 05 page 7 of 29 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 8.3. voltage regulation (sense) the voltage o n the sense pins is fo rce d to the vref level. dep endin g o n the applie d vref, the maximum deviati on is spe c ifie d as: vsen se = v r e f +/- vsen se_ e rrx (see ele c tri c al sp ecifi c ation ) x the voltage regulatio n sp e c ificatio n is o n ly valid for isense and csense value s within specification. x maximum total cap a cito r load in clude s the wirin g pa rasitic cap a cit ance and hall switch suppl y cap a cito r if applicable. x the outp ut settling time on pins sens e 1 ? sen se6 for the sel e cted cha nne l is trise after enable pin is s e t high. enab le tr ise su pply voltage of t h e s e le c t ed sense ch an nel 0v vr e f 8.4. output voltage to the microcontroller adc ( m e a s_o u t) the micro c o n trolle r can e v aluate/diag n o se the state of the interlock swit ch ba sed on the voltage that its adc will m e asure on the m eas_out pi n. x the vmeasout output voltage is not higher than vref + 0. 5v to avoid damaging of the microcontroll er adc input. x the measout pin is able to deliver minimum imeas. x meas_out can be made high i m pedant to allow m u lt iplexing of 2 or more m l x16305 devi c es i n parall e l wh en more than 6 cha nnel s are requi re d. 3901 0163 05 page 8 of 29 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 8.5. digital inputs definitio n s: ? digital inp u t pins ena b le, vi_ctrl an d m u x_sense[0:2] have ttl ch aract e risti c . additionally these pin s h a v e intern al p u ll do wn s for a define d reset b ehavio r of the com p let e sy st em. ? logi c levels : low : v v il and high : v v ih ? bit repre s ent ation. to sele ct sense cha nnel 1, set ? mux_sens e 0: 0 ? mux_sens e 1: 0 ? mux_sens e 2: 1 in his do cum ent this is rep r esented a s mux_sens e [0:2]=001b functio n a l ity: ? mux_sens e [0:2] has a doubl e functi on o it control s the multiplexer that sele cts th e cha nnel tha t is to be sen s ed/me asure d o and these in p u ts are lat c he d into mu xsense latched [ 0 :2] when enable goes hi gh. ? enable has a doubl e function o whe n enabl e =0 the mu xsensel atch ed [0:2] sign als are identi c al to the m u x_sense inputs. whe n enabl e=1, the m u x_sense si gnal s are l a tch ed i n to muxsen selatche d [0:2]. this way a diffe rent ch ann el can be sen s e d , from the on e supplie d (mux _sense muxsen sel a tche d). o enable resets mux _ sup to 000b wh en enable is logi c lo w. this di sco nne cts all cha nnel s fro m the voltage reg u lator (isense=0ma) a nd a c tivates a we ak pull d o wn on a l l pins. ? vi_ctrl sel e cts cu rre nt mode o r voltage mod e (se e belo w ) 3901 0163 05 page 9 of 29 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 8.6. encoder: intern al digital signals ? muxsenselat che d [0:2] si g nals are d e fined by the m u x_sense and e n able input s. it is use d for 3 purpo se s: o to go to overtemp mea s ureme n t mode o to set meas_out hi gh im pedant o to sele ct the cha nnel that i s to be su ppli ed with vref. muxsenselat che d = mux _ sup if enable = 1 the sta nda rd relation bet ween mux _ sense, en able and muxsense latched can be viewed as a latch that is controll ed by enable: o enable = 0 ? then the latch is tran spa r en t: muxsensel atche d == m u x_sense o enable = 1 ? then the lat c h i s clo s e d : mux_se nse ca n b e ch ange d without influ enci ng muxsenselat che d . mu x_sup[0:2] mux_sup[0:2] z mu x_s e n s e[0:2 ] en a b l e o vertemp muxsenselatched[0:2] mux_sup == muxsenselatche d and enable the mux_s u p[0:2] signa ls co ntrol the multiplexe r th at sele cts the chan nel on whi c h the voltage regul ator will force v r ef. 1. apply on mux_sense the value of th e ch ann el that sho u ld be sup p lied whil e enable is low. 2. then switch enable high to latch this state into muxsense latche d . 3. as long as e n able stay s high the sel e ct ed se ns e pin will be supplied wit h the vref voltage. 4. in the mean time mux_s e nse may chang e. this allows dia g n o stics fo r sh o r ts bet wee n sense pins. one chan nel can be sup p lied with vref and a nother ca n be sen s ed. (mux_s up ? mux_sens e ) 5. as soon a s enable go e s lo w again, mux_sup is re set to 000 b, hen ce di sabling every channel. the weak pull down on ever y sense pin will then pull vsense down. overtemp (dominant setting ): in orde r to se t overtemp = 1 mu xsense latch[0 :2] has to be set to 111b. o when enab le = 0, the overtemp c o nditi on c a n be read out on the meas_out pin by setting mux _ sense = 11 1b. o whe n ena b le turns = 1 muxs enselat che d remai n s = 111b. ch ange s o n mux_sens e [0:2] are ne glecte d (= d o n ?t care ). 3901 0163 05 page 10 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic z or high impedant (dominant setting): in orde r to se t z = 1 muxsense latch [0:2] has to be set to 000b. o whe n enable = 0, mux _ sense has to be set to 000b. o whe n enable turns = 1 muxsenselat che d rem a in s = 000b. cha nge s on mux_sens e [0:2] are ne glecte d (= d o n ?t care ). mind that both overtem p =1 or z = 1, a r e domi nant settings on me as_out. th is implie s that any cha nge s on vi_ct r l and mux _ sense[0:2] are not visible. mind . do not confu s e the latch with a flip-flop whi c h is o n ly sen s itive duri ng risi ng ed g e of the enab le. the latch is tran spa r e n t for input cha nge s whil st enable is low, not only during the risi ng edge. timing diagram 00 1 m u xs ens e [ 0 : 2 ] en ab le muxsen sela tch ed[0:2] 001 010 010 m u x_su p[ 0: 2] over t e m p z 000 000 000 000 000 001 010 111 100 000 000 1 2 3 4 5 6 7 8 9 10 111 111 the above ti ming diag ram sho w s h o w t he input s are conve r ted int e rnally: n in case of mu ltiplexing 2 or more devi c e s , the system shoul d start up with mux sense[0:2] and enable = 0 for all devic es in order to avoid c o nflic ts on the measout output. o changes on muxsense are not seen by the dev ice as long as enable is kept high. p in order to switch from one device to a nother device al l muxsense inputs are reset to 000b. q in order to s t art switc h muxsense at r , all other d e vice s sh ould have set enable high. r a. in current mode channel 0 is s e lec t ed, vmeasout = vmeas(offs et)as long as enable is low. b. in voltage mode, no channel is selected, so vmeas remains 0v. s a. in cm the voltage reg u lato r sup p lie s cu rrent to ch ann el 0 (isen s e 0 ). isense0 i s copied onto rref, and can be cal c ulated from vmeasout. b. in vm the voltage re gulato r suppli e s vref to chann el 0 (vse nse0). vsen se 0 is cop i ed on vmeasout. t enable remains high a. in cm c h anges on muxsense are neglec ted (don?t c a re) b. in vm, the voltage is mea s ured o n ch an nel 1, whi c h h a s its wea k p u ll down activ e . if vsen se1 > 0 v then a sho r t to channel 1 is found. u enable goe s low, di sabli ng all ch ann e l s whil e ch an nel 1 is sele cted. see r v enable goes high and low agai n wh ile muxsense rema ins unchanged. a. in cm isen se 1 can b e mea s ured while e n able is hig h . b. in vm channel 1 is supplied with vref an d the resulting vsense1 i s copi ed to vmeasout w muxsense =111b di splays the overtemp conditi on on the me asout pin. 3901 0163 05 page 11 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic mux_sense en a b le muxsense lat c h e d mux_sup z/o v er tem p vi_ctr l me a s _ o u t descripti o n f a u l t de tect ed on me a s _ o ut 0 0 1 0 0 0 1 0 0 0 0 / 0 0 v ( s e n s e 1 ) / 2 0 1 0 0 0 1 0 0 0 0 0 / 0 0 v ( s e n s e 2 ) / 2 0 1 1 0 0 1 1 0 0 0 0 / 0 0 v ( s e n s e 3 ) / 2 1 0 0 0 1 0 0 0 0 0 0 / 0 0 v ( s e n s e 4 ) / 2 1 0 1 0 1 0 1 0 0 0 0 / 0 0 v ( s e n s e 5 ) / 2 1 1 0 0 1 1 0 0 0 0 0 / 0 0 v ( s e n s e 6 ) / 2 mux_sup=000: sense pins are not supplied, and the w eak pull do w n is active. mux_sense selects the sense pins to be monitored in voltage mode vmea s_ou t = vsense/2. normal v m eas_dis, then the w eak pull do w n is overrule d. a short to vb at or to an other high voltage nod e is detected. 0 0 1 0 0 0 1 0 0 0 0 / 0 1 0 v 0 1 0 0 0 1 0 0 0 0 0 / 0 1 0 v 0 1 1 0 0 1 1 0 0 0 0 / 0 1 0 v 1 0 0 0 1 0 0 0 0 0 0 / 0 1 0 v 1 0 1 0 1 0 1 0 0 0 0 / 0 1 0 v 1 1 0 0 1 1 0 0 0 0 0 / 0 1 0 v mux_sup=000: sense pins are not supplied, and the w eak pull do w n is active. mux_sense selects the sense pins to be monitored in curr ent mode: since there is no curre nt supplied, no curr ent can be copied on rref . state used in ap plication for offset measurement vmeas_o u t(off s et) = 0.9*ioffset *rref x x x 1 0 0 0 1 / 0 x z 0 0 0 0 0 0 0 0 0 0 1 / 0 x z mux_sense=00 0 is latched to set z=1 meas_out is hi gh impedant. x x x 1 1 1 1 0 / 1 x o v t e m p 1 1 1 0 1 1 1 0 / 1 x o v t e m p mux_sense=11 1 has been latched to set ov ertemp= 1 o vertemp => vmeaso ut>v measo ut_ o th; else: vmeaso ut normal: sho r t to vbat else vmeaso ut< normal: sho r t to g n d on the sensed ch annel 001 1 other than 001/0 00/111 0/0 0 v(sensex)/ 2 meas_out = v o ltage on sens e 1 pin divided by 2 010 1 other than 010/0 00/111 0/0 0 v(sensex)/ 2 meas_out = v o ltage on sens e 2 pin divided by 2 011 1 other than 011/0 00/111 0/0 0 v(sensex)/ 2 meas_out = v o ltage on sens e 3 pin divided by 2 100 1 other than 100/0 00/111 0/0 0 v(sensex)/ 2 meas_out = v o ltage on sens e 4 pin divided by 2 101 1 other than 101/0 00/111 0/0 0 v(sensex)/ 2 meas_out = v o ltage on sens e 5 pin divided by 2 110 1 other than 110/0 00/111 0/0 0 v(sensex)/ 2 meas_out = v o ltage on sens e 6 pin divided by 2 normal open w i re vmeaso ut > vref*0.9: => s hort to g nd (*)in cm vmeas out in th e abov e table is the calculated value afte r subtracting th e contribution of t he offset = vmeasout - vme a s out (offs et) 3901 0163 05 page 12 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 9. v o ltage m o de (vm ) to go into voltage mode (vm) vi_ctrl is set low. in this mode the resulting voltage on the sense pi n (v sense ) is c opied onto the meas_out pin. for normal operating c o nditions (vref> v s ense) it c an be cal c ulate d ba ck a s : x for 3v < v sense < 8.25v - v measo ut min = [v sense * (1 - meas_verr1)] / 2 - v me asout _voff set - v measo ut ma x = [ v sense * (1 + meas _verr1)] / 2 + v m e asout _voff set x f o r v sense < 3v the accuracy is redu ce d to meas_v err2. this c o ndition c an occ u r - with a s h ort to gnd - or for dete c ting short s to an extern al voltage b e low 3v. this ca se ca n be di a gno sed by sele cting a pin witho u t supplying it with t he regul ated voltage. any voltag e that is measured ha s to be due to an external sour ce that is con n e c ted to that pin. x f o r v sense > v ref (short to supply) - v measo ut ma x < v ref + 0.5v this conditio n can b e diag nosed with th e sense pi n in high impe d ant state (we a k pull d o wn is active), a s we ll as in the sta t e with the ch annel i s su ppl ied with the regulate d voltage. rema r k x whe n a sense pin is measu r ed in volt age mod e (v m) witho u t be ing su pplied by the voltage regul ator, the n an intern al pull do wn kee p s the voltag e on that sense pin low, unle ss it is overruled by a sho r t to sup p ly. o if no short to vbat is forced then: v measo ut < v m e as_d i s 3901 0163 05 page 13 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 10. current mode (cm ) the high a ccura cy of the mlx163 05 can be u s ed x to define cle a r boun da rie s of voltages. these bou nd arie s will allo w straightforward cla s sification of the state of current mod u lated switch es. x to measu r e in dustry standa rd cu rrent mo dulated sen s ors (for in stan ce with the m l x9030 8, mlx903 14) 10.1. current to voltag e conversion principle the curre n t isense, sup p lied by th e voltage reg u lat o r, is co pied on the rref pin with a 10 :1 ratio. thi s curre n t is con v erted into voltage informat ion via the exte rnal rref resi stor. an additional offset current i s force d on rre f. this result s in a voltage over the rref resi stor of x v rref = (i se ns e / 10 + i off s e t ) * r ref this v rref is then copied on the measout pin with a factor of 0.9, i.e.: x v measo ut = v rref * 0.9 10.2. the actual measurement in current mo de 2 type of measurement s ca n be di stingui she d : 1) offs et me asureme nt while the volt age re gulato r is disa bled, the co ntributio n of the intern al offset cu rre nt can be me asu r ed. x v measo ut (vre g is disable d ) = v m eas out _ ioffset 2) ac tual ise n se measu re ment whe n a cha n nel is sel e cte d and enabl e is set high, the isen se of the sele cted cha nnel will b e copie d on top of the offset current ont o rref. x v measo ut _ (vreg enable d ) = v measo ut _enabled from thi s we can d e rive x v calc_i sens e = v measo ut _enabled - v m e aso u t _ i o f f s e t remar ks: x the cu rrent i s al way s copi ed di re ctly fro m the volta g e re gulato r . t herefo r e a s soon as enab le has gone hig h to fix which cha nnel i s supplie d (m ux _sup is fixed ) , then mux _ sense beco m es don?t ca re! 3901 0163 05 page 14 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 10.3. how to do an offset current measurement in current mode (vi_ctrl is s e t high hi gh), set enable = low. this will set mux_sup[0: 2] = 000 whi c h will di sable the voltage regu lator, such that no isense curr ent is mirrored into rref. rem a r k s : ? possi ble sho r ts on the se nse cha nnel s have no infl uen ce on the offset mea s urement. ? since e n abl e is lo w, the l a tch i s tran sp arent. the r ef ore ma ke su re mux _ sense 00 0b o r 111b in orde r to avoid the z or the ov ertemp co ndition (m uxsenselat che d 000b o r 11 1b) ? offset may d r ift over lon g e r peri o d s of time a n d im portant temp eratu r e va riat ions. befo re every measurement sequ en ce th e offset mea s ureme n t sho u ld be re peat ed. ? in ca se multi p le rref val u es are u s ed for the di fferent sen s e in puts ? for in stan ce to set different sen s itivity levels), then t he offset voltage (v m eas o u t _ ioffset ) has to be m easure d for each rref individually. any chang e to rref impli e s a new offset measurement . ? in ca se multi p le mlx 1630 5 devi c e s a r e used in pa ral l el, the offset sho u ld be m e asu r ed an d stored for every device. ? an open wi re conditio n has ise n se = 0ma, and as a re sult only ioffset will co n t ribute to th e voltage over rref. therefo r e vmeasout_e nable d [open wire] = v m e a s out _ ioffset 3901 0163 05 page 15 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 10.4. m e asurem e nt errors 5m a 0. 05 v i s ense vm ea so ut -5% n o o p er a t io n actu al value -2 5 u a w o rs t case m i n +5 % +25 u a w o rs t case m a x in the above grap h the errors valu es a r e sho w n in current mode. do wn to 5ma %meas_ierr1 and bel ow 5ma imeas_i err2. for in stan ce for isen se > 5 m a, then v measout _ise nse ~ i s en se +/ -5 % remar ks: x the e rro r ov er the total chain in cm (%meas_i errx) doe s not in clud e erro r d ue to the ext e rnal rre f re sist o r . x in the full system cal c ulati on additio nal errors have t o be ad ded f o r the tole ran c e s on the sensor curre n t, the adc sup p ly no ise, etc. 3901 0163 05 page 16 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 11. how to predict th e system operating zone 11.1. vm easo ut limits the wors t c a s e output voltages , inc l uding measur ement errors , on the meas_out pin c an be predic t ed with following formulas : ? for 5ma < i sense 40ma - v measo ut min = [i sen se /10 * (1 - %meas_ierr1) + ioffs etmin ] * r ref * 0.9 - v measo ut ma x = [i sen se /10 * (1 + %meas _ ierr1) + ioffs etmax ] * r ref * 0.9 ? f o r i sense 5m a - v measo ut min = [i sen se / 10 - imeas _ierr2 + ioffs etmin ] * r ref * 0.9 - v measo ut max = [i sen se / 10 + imeas _ ierr2 + ioffs etmax ] * r ref * 0.9 11.2. isense limits the op erati ng ra nge, and the corre s p ondin g maximum isen se, is defined by the vsup-v r e f range a s sho w n in the grap h. vsup 10 .5 v 16 .25 v 25 v i s en se <45ma <30ma <40ma nop 8v 9.5 v vr ef 8.25 v 7v 3v 4.5 v 11 v n o op er at i o n a l l o w e d other limiting spec ificatio n s are: 1) absolute maximum all o wa ble ise n se < 90ma: und e r n o con d ition the ise n se cu rrent should be la rg er than 90ma , in orde r to avoid pe rman ent dama g e to the ic. 2) minimu m curre n t limitation threshold : see overcurrent limitation (next parag raph ) 3) overte mpe r ature sh utdo wn: see o v er te mp er a t ur e d e tec t io n 3901 0163 05 page 17 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 12. overcurrent limitation the mlx1 63 05 ha s a buil t -in overcu rre nt limitation as protectio n again s t de struction a nd ov erhe ating. it also all o ws d e tecting sho r t circuits to ground o n any of the sense chann els. the v o ltage regulator w i ll e n ter c u rrent limitation w h e n the v o ltage o v er the exte r nal rr ef resistance (vrref ) is bet w e e n vre f and vref + 3v: vref < v rref(limit act iv ated) < vref + 3v the curre n t limitation is realized by re duci ng th e force d outp u t voltage on the sense pin (vsense), until vrref drops below the limitation threshold. the g r ap h shows the t r e nds of isen se (~vrref ) and vse n se for an exam pl e whe r e: vref = 5v an d rref =1 k ?. as the rse n s e ?l oad? dro p s f r om no rmal op eratin g rang e do wn to a short ci rcuit conditio n isen se i s theoreti c ally clam ped b e twee n 40 and 8 0 ma, depe nding o n ioffset: isen selimmi n = (vref/rref ? (ioffsetmax = 1ma) )*10 isen selimm a x = (vref + 3)/ r ref *10 rem a r k ? und e r any co ndition, inclu d ing durin g curre n t limitation it is guara n teed that vmeas out < vref + 0 .5v 0 10 20 30 40 50 60 70 80 90 r s en se [m a ] 0 1 2 3 4 5 6 [v] is e n s e m a x is e n s e m i n vs e n s e m a x vs e n s e m i n ope r a t ing ra nge cu rr en t lim iting the current limiting shou ld a l s o be ta k e n in to accou n t to set the minimum allowable operatin g c u rrent. the graph o n the right sho w s the mini m u m isen se limits for rref = 1koh m for different values of minimum vsup: ? zone c is d ue to the cu rrent limiting ? zone d is d ue to isen se max spe c ifica t ion o d a: 30ma o d b: 40ma o d c: 45ma rema rk that zone c will s h ift to the right when increa sing rref, and to the left with redu cing rref is e n s e lim i t ( v s up) 20 25 30 35 40 45 50 3 3 .5 4 4 . 5 5 5 .5 6 6 .5 7 7 .5 8 vr e f [ v ] a ] [m 8v 9v 12 v 16 v 20 v 1 2a 2b 2c 3901 0163 05 page 18 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic rem a r k 1 : whe n red u ci ng rref, the absol ute maximum isen se curre n t be limited to 90ma. for in st an ce x for vref = 3v => ise n selim [20, 60]ma so even if vsup -vref all o ws high er cu rre nts, the o p e rating ra nge is limited by the cu rrent li mitation. an alternative is to redu ce rre f, to increas e the c u rrent limit. for in stan ce rref = 500 : => isen selim [40, 120]ma rema rk that the ab solute maximum ise n se curre n t should. x vref = 8.25v => isen selim [72.5, 112.5]ma rema rk that the ab solute maximum is ens e c u rrent is limited to 90ma. an alternative is to increase rref, for i n stan ce to 15 00 : => isen selim [45, 75]ma rem a r k 2: current limitation can be monitored via the voltage on meas_out: x in current mo de: v m eas out = [ 0.9* v re f , v ref + 0.5v ] x in voltage mode: v m eas out = v sens e / 2 < v ref / 2 13. overtemperature detection the mlx16 3 05 ha s an int e rnal ove r tem peratu r e d e te ction to prote c t again s t de stru ction an d overhe ating. by applying the co rrect seque nce on the digital in put pins th e overtemp state is read able via the meas_out pin coded as: x vmeas d vm eas_otl = normal operation x vmeas t vm eas_oth = overtemperature c o ndition detec ted. when an ov ertemperature condition i s detected the supply regulator will shut down until the overtem p con d ition ha s gone. then diagn osti cs should sho w t he root cau s e of the ov ertemperature co ndition. 3901 0163 05 page 19 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 13.1. overtemperature considerations dep endin g o n the layo ut o f the pcb, th e th ermal re sistan ce of a narro w b ody so16 pa cka ge can be as low as 82 o c/ w (ide al refe rence value fo r a 4 layer p c b). for the bel ow calculation s we u s e 10 0 o c/w. the in crea se in ju nctio n te mperature (tj) d ue to en ergy dissip ation in the line a r voltage regul ator ca n b e cal c ulate d as follows: ? assu ming wo rst case ope rating co nditio n s vsup = 18 v and tamb = 85 o c. ? and vref=5 v and rref = 1kohm, example 1: 40ma con t inuous assu ming the maximum su pply current i s d r a w n f r om a sen s e pin, and th e volta ge i s regul ate d to vref (no sho r t conditio n ) ? dissip ation d ue the this: 4 0 ma * (18-5)v = 0.52w additionally the cu rrent so urces sup p ly rref with isense/10 + ioffs et (< 1ma) ? maximum di ssipatio n due t he this: (40 m a/10 + 1ma) * (18-5)v = 0 . 07w therefore the maximum po wer di ssipatio n on the mlx 1630 5 is 0.59 w. ? the maximu m junction te mperature i s then 85 o c+ 10 0 o c/w* 0.59 w = 144 o c. this is o u tsi de the ope rating ran ge. furtherm o re the mlx 1630 5 may shut do wn d ue to overtemp erat ure si nce tj > t shutdown . example 2: dut y c y clin g in practi ce th e controller will scan the diffe rent sense outputs one by one. as describ ed in above ( di agn ostics flow ) the regul ator ca n be expecte d to be ac tive for example for 0.5ms p e r pin, inclu d ing 25 0 u s settling time. at tamb = 85 o c, tj<90 o c can be gu ara n t eed as follo ws: the heatin g o f 59 o c in example1 c an be reduc e d by waiti ng 5.5ms before s e lec t ing the next pin the flow then becom es: 0.5ms evalu a t ing pin1 => 5.5ms off => 0.5m s evalu a ting pin2 => 5.5m s off => ? or al so: evaluate all 6 pin s co nsecutiv ely (6*0.5ms) and switch off for > 33m s example3: s hort to g nd short to grou nd implie s that vsen se = 0v. whe n the re g u lated supply is applie d, then the sen s e voltage will be ke pt at 0v by the sho r t, and the internal current limitation will limit the cu rre nt to for i n sta n c e 50ma. t h erefo r e th e p o we r dissipatio n from the sense pin is ? wo rst case dissi pation d u e the sho r t: 50ma * 18v = 0.9w the co ntroll er will immediat ely diagno se the failure, an d swit ch off the sup p ly. therefore no dissipatio n wi ll be due to th is. wors t ca se the mlx16 305 will g o in overtempe r a t ure and shut do wn itself. 3901 0163 05 page 20 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 14. diagnostics 14.1. shorts long wire s to the remote switch es a r e p r one to sho r t s to gro und, to supply o r betwe en the wire s. the mlx163 05 all o ws co ntinuo us failure mo de diag nosti cs on ea ch se nse pin indiv i dually. the circuit wo rks also if one of the sense pins is sho r ted to gnd o r v bat (up to +2 5v); this mea n s that such a sho r t doe s not influen ce the measure m ent on othe r sense pins. a. shorts t o gn d a short b e tween a sens e pin and g nd can b e d i agno se d eith er in current mode (cm ) or in voltage mode. the short will cau s e the volta ge sou r ce to go i n current li mitation. a s d e scrib ed i n the ? o vercurren t limitation? paragra ph ab ove , the voltage over rref (vrref) will rise to vref. x in current mo de (cm) ove r curre n t is det ected a s vmeasout = 0.9* vref x in voltage mode over-current is dete c te d as vmeasout < vref/2 . this value m a y howeve r a l so indi cate a n open o r clo s ed swit ch. therefore it is re com m end ed t o diagn ose sho r ts to gnd in cm. b. shorts to supply (vsup) a short b e tween a sens e pin and a high voltage l e vel, like vign or eve n directly to the battery sup p ly vbat, can be diagnosed i n voltage mode: m e thod 1: s e nse pin not activ ely su pplied x set all sense pins high i m peda nt (mux_sup[0:2]=000b ), x then sele ct the re spe c tive sense pins one by one in voltage mod e (vm). => t he weak pull do wn on each sense pin sh ould yie l d vmeas < vmeas_dis. any higher va lue indi cate s a sho r t to a supply voltage . m e thod 2: s e nse pin actively suppli e d whe n there is a sh ort to supply on a pin that is suppli ed by the voltage regulato r , then the meas_out voltage will be la rger than vref/2. vref/2 < vmeasout < vref c . sh o r t s b e t w een w i r e s a sho r t betwe en the wi re s con n e c ting th e se nse pin s to the remote swit che s can be diag no se d in a simil a r way as sho r ts to supply: x select a sense pin. t h is cha nnel will b e suppli ed wit h vref, and act a s th e su pply in th e ?s hort to supply? ca se. x then sele ct the other sense pins one by one in voltage mod e (v m). the weak pull down on the other se nse pin s h ou ld yield vmeas < vmeas_dis. any higher value indicates a short to the se lected sens e pin. to have an unambi guou s dia gno stics first che ck ?sho rts to supply? before che c king ?s horts b e twe e n wire s?. 14.2. open wire in an op en wire co nditio n , the reg u lat o r can n o t su ppl y any cu rrent (ise nse= 0ma). thi s con d ition can not be che cked in volta g e mode. in current mo de i o ffset will ge nerate a sign al on rre f. therefore fo r the anal og m easure m ent chain, an ope n wire co nditio n s i s ide n tical to an offset measurement . mind that due to r vme a s_ie rr2 it is possibl e that after su btra cti on of the offset, a negative value may re sult! 3901 0163 05 page 21 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 14.3. diagnostics flow example soft ware flow for interlo ck swit ch dia gno stics: 1) set enable low a. set mux_sensex (sele c t cha nnel ) b. set to vmode: evaluate sh ort to vbat 2) set enable high: su pply selecte d ch an nel : wait 250 us to allo w the output to se ttle. a. in the mean time set imode . b. 250u s after e n able has b een set high -> evaluate the measured current value c. set to vmode and evaluate short to grou nd d. set one by o ne all othe r chann els to e v aluate short s bet wee n th e su pplied pi n and th e other chan nel s 3) return to 1) for fu rther di scussio n s i n this do cum e n t it assum ed that the flow for 1 pin co ul d be compl e ted in 0.5m s inclu d ing the 250u s settling time. 3901 0163 05 page 22 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 15. m u ltiplexing the adc input by setting m e as_out high impedant by applying t he corre c t se quen ce on th e digital i nput pin s the me as_out pin can be set hi gh imp eda nt. this i s of inte rest wh en u s i ng 2 o r m o re mlx163 05 i n pa rallel fo r appli c ation s with mo re th a n 6 swit che s to be monitored. the MLX16305 d e vices are t hen m u ltiplexed on the same a d c input chan nel. the ad inp u t from the microco n trolle r ca n be sh ar e d b y multiple MLX16305 d e vices in pa rallel. with 1 extra digital io serv ing as enab le for a se co nd device, 6more cha nnel s ca n be cont rolled. procedu re: x first while enable2=0, set mux_sense[0:2] = 000b x then latch this value by set t ing enable2 = 1 x from now on measout2 i s high impedant, and regardless the val ues of vi_ct r l or mux_sens e [0:2], this remains . x switchin g fro m device on e to device two is done by setting mux_ sense[0:2] = 000 b whil e enable1=0. setting enable1=1 ma kes measout1 high impedant. x no w enabl e2 can be re set to 0 witho u t possible co nflict betwe en the 2 measout o u tputs. m l x 1 630 5 mi c r o c t r l en abl e1 vi _ c t r l m eas_ o u t vr ef rr e f k l15 / i g n s ens e1 s ens e2 s ens e3 s ens e4 s ens e5 s ens e6 vsu p ad c en abl e 2 m u x_ sen s e 2 m u x_ sen s e 1 m u x_ sen s e 0 m l x 1 6 305 rr e f s ens e 1 s ens e 2 s ens e 3 s ens e 4 s ens e 5 s ens e 6 3901 0163 05 page 23 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 16. application notes 16.1. system definition exam ple wit h 2-wire hall switch es the m l x163 05 can be u s ed with so ca lled 2 - wi re hall effect switche s , li ke th e mlx90 275. these req u ir e typically a minimum op erat ing voltage of 3.5v, and ha ve 2 well defi ned current st ates. for in stance: ? ioff: [5; 6.9]ma ? ion: [12; 17]ma an example i s elab orate d for ? vsup > 8.5v mind that o n the safety ecu often hig her voltag es ar e available from the squi b drive r s. t h ese ca n al so be used in st ead of the bat tery voltage to further exte nd the ope rati ng zo ne. and furtherm o re ? vref = 5v ? vsup-vref = 3.5v ? isen semax = 40ma ? rref =1 k ? ? is ens elim > 40ma since the out put voltage i n cu rre nt mo de is u ndefin ed in case of a sho r t to supply, we sta r t in voltage mode to diag nose this faul t condition first. vi_ctrl=0 1. short to vb at all sense chann els a r e disa bled (e nable=0) a n d sca nne d one by one. if a n y of the output values rises above vmeas_dis, this mean s the weak pull down i s overru led by a short to the supply . 2. short be t w e e n w i r es. in a simila r way if one cha nnel is sup p li ed with vref, all other cha n nels can be checke d on a sho r t to this supplied channel. if a n y of the output values ri ses above vmeas_dis, th i s means the weak pul l down on the sele cted ch annel is ove r ruled by a s hort to the supplie d cha n nel. in a 6 cha nnel appli c ation, 1 5 different wi re-to-wire sh orts can b e ch e c ked an d dia gno sed o ne b y one. vi_ctrl=1 in current mo de (cm) 4 mo re co ndition s can b e diag n o se d. step 1: the first ste p is to g u a r an tee that ea ch mea s ureme n t is in th e t a rget ope rati ng zone und er a n y co rn e r con d ition. two toleran c e s have to be taken into ac count wh en calcul ating the border val ues for ea ch con d ition: th e offset and the mea s u r em ent error. rem a rk for si m p licity of th e exam ple we did n o t calc ulate tol e ra n c e s on exte rnal com pone nts (li k e rref) and othe r noi se source s like adc suppl y. these ha ve to be added i n a real syste m definition. as cal c ulatio n example s the voltage ra nge corr e s po nding to the off state is cal c ulate d : the minimu m worst ca se si tuation is calculated u s ing ? ioffmin = 5ma ? ioffsetmin = 0 . 055ma ? erro r = - 5% ? vmeasout (offmin ) = (isense/10 * 0.95 + ioffsetmin) * rre f * 0.9 = 0.477 v the maximu m worst ca se situation is calcul ated u s in g ? ioffmax = 6.9ma ? ioffs etmax = 1ma ? erro r = + 5% ? vmeasout (offmax) = (isen s e/1 0 * 1.05 + ioffsetmax) * rref * 0.9 = 1.076 v 3901 0163 05 page 24 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic ? vmeasout (off) = [ 0.477, 1.552 ] v in a similar way the corn er values for the on co ndition can be cal c ul ated to be ? vmeaso u t (o n) = [ 1. 076 , 2.507 ] v therefore all vmeasout values a r e withi n [0.05, vref] step 2: the act ual m easure m ent value is the su btractio n of vmeasout (ise nse ) - vmea sout (ioffset). in voltage that would corre s po nd to ? v (off) = vmeasout (off) - vme asout (ioffset) = [ 0.430, 0.607 ] v ? v (on) = vmeasout (on) - vmeasout (ioffset) = [ 1.028, 1.562 ] v therefore the 2 states c an be cle a rly dist ingui shed. furthe rmo r e depe nding o n the definiti on of an ?o p en wi re ? o r a ?sho rt to gro und? si milar v a lue s ca n be cal c ulate d to further di sting u ish failu re m ode conditio n s . 16.2. resistive switches re sistive switche s are e ssentially al so acting like cu rre nt mo dulat ed swit che s . the r efo r e di agno stics are done in the same man ner. the mlx16 3 05 ca n su ppl y plenty of cleaning curre n t to allow the u s e of low co st switche s . neverth e le ss, aging m a y cause drift of the conta c t re sista n ce valu es ove r life. the hig h a c cura cy of the mlx163 05 all o ws tra ckin g of such a ca se and ea rly triggeri ng of em inent failure s. 16.3. 2-wire analog sensors industri a l se nso r s and se nso r inte rfaces li ke the mlx903 08 h a ve a 4 to 2 0 ma cu rrent ran ge. the mlx163 05 can be u s ed to sequ entially read the m ou t. the offset an d any non-li n earity indu ce d by the 1630 5 in cu rre nt mode can be calib rated tog e ther with th e sen s o r in pro ductio n su ch that a vmeasout va lue i s dire ctly rela ted to the sen s or o u tput. 3901 0163 05 page 25 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 16.4. ground shift the mlx16 3 05 allo ws con nectin g a rem o te ?2-wi r e? h a ll sen s o r wit h only 1 wire. since the current is di rectly sensed, the meas urem ent itself is immune to ground shift. furthermore [vref ? vgroundsift] sh ould be guaranteed to be larger t han the m i nimum suppl y current for the hall se nsor. for in sta n ce for v s up min = 3.5v, and vref = 5v, a groun dshift of 1.5v is accepta b le. therefore th e grou nd can be taken lo ca l from the ch as sis, redu ci ng the conn e c to r pi n count on the safety ecu, and red u cin g the wiri ng of the cabl es from the e cu to the re mote sen s o r s. mc u mc u i se n s e i se nse vd d gn d i ou t 10 nf vd d m i n ml x 1 6 3 0 5 ad c ad c vd d gn d i out 10 nf vd d m i n co n n e c t o r co n n e c t o r mc u vd d gn d v ou t ad c co n n ec t o r 10 nf a) 3- w i r e h a l l b) 2- w i r e h a l l c ) ? s i ngl e? - w i r e h a l l us i n g m l x1630 5 3901 0163 05 page 26 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 17. s tandard information regard ing manufacturability of m e lexis products with dif ferent soldering processes our p r od uct s are cl assified and qu alified rega rdi ng solderin g tech no logy, solde r a b ility and moisture sensitivity level according t o following test methods: reflo w soldering s m d ? s ( s urfa c e m o u n t d ev ices) x ipc/jede c j - std - 02 0 moistu re/reflow sen s itivity classificatio n for non h e r metic solid state surface mount devi ce s (cla ssificatio n reflow p r ofile s acco rdin g to table 5-2 ) x eia/j e dec jesd22-a 113 preconditio n ing of non hermetic surfa c e mount devices prio r to re liability testin g (reflo w profile s acco rdin g to table 2) wav e s o l d e r i n g s m d ? s ( s urfac e m oun t d ev ices) a n d t h d ? s ( t h r o u g h h ole d ev ices) x en607 49 -20 re sista n ce of plastic- en ca psul ated sm d?s to combin ed effect of moisture and solderi ng he at x eia/jedec jesd22-b 106 and en6 074 9 - 15 re sista n ce to solde r ing te mperature fo r through -h ole mounted dev ice s solderabilit y s m d ? s ( s u r f a c e m oun t d ev ices) a n d t h d ? s ( t hro u g h h o l e d e v ices) x eia/jedec jesd22-b 102 and en6 074 9 - 21 solderability for all solde r i ng tech nolo g i e s deviatin g from ab ove mentione d stan dard con d itio ns (reg ardi ng peak temperature, temperature gradi ent, te mperatu r e p r ofi l e etc) ad ditio nal cla s sificat i on and q ualif ication te sts have to be ag reed u pon with melexis. the appli c ati on of wave s o lderi ng for s m d?s i s allo wed only after con s ultin g melexis re ga rdi ng assu ran c e of adhe sive strength bet we en device an d board. melexis is co ntributing to g l obal envir on mental co nse r vation by pro m oting lead free sol u t i on s. for mor e information on qualifications of ro hs co mpliant produ cts (ro h s = euro p ean di rective on the re strictio n of the use of certai n ha za r dou s substa n c e s ) ple a se visit the quality page o n our web s ite: http://www.m e lex i s.c o m/qu ality . asp 18. esd precautions electro n ic se micon d u c tor prod uct s are sen s itive to electro static disch a rg e (e sd). always ob se rve electro static di scharg e control procedures whe n e ver han dling semicond uct o r produ cts. 3901 0163 05 page 27 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 19. package information unit : mm package typ e d e h a a 1 e b l . p a c k a g e cod e soic16 narro w body min max 9.80 10.00 3.80 4.00 5.80 6.20 1.35 1.75 0.10 0.25 1.27 0.33 0.51 0.40 1.27 0o 8o dc16 3901 0163 05 page 28 of 2 9 data sheet rev. 005 oct/06
MLX16305 interlock switch sensor interface ic 3901016305 page 29 of 29 data sheet rev. 005 oct/06 20. disclaimer devices sold by melexis are covered by the warran ty and patent indemnification provisions appearing in its term of sale. melexis makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. melexis reserves the right to change specifications and prices at any time and without notice. therefore, prior to designing this product into a system, it is nec essary to check with melexi s for current information. this product is intended for use in normal commercial applications. applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustai ning equipment are specifically not recommended without additional processing by melexis for each application. the information furnished by melexis is believed to be correct and accurate. however, melexis shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, inte rrupt of business or indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. no obligation or liabilit y to recipient or any third party shall arise or flow out of melexis? rendering of technical or other services. ? 2006 melexis nv. all rights reserved. for the latest version of this document, go to our website at www.melexis.com or for additional information contact melexis direct: europe and japan: all other locations: phone: +32 1367 0495 phone: +1 603 223 2362 e-mail: sales_europe@melexis.com e-mail: sales_usa@melexis.com iso/ts 16949 and iso14001 certified

▲Up To Search▲

Price & Availability of MLX16305

	To Download MLX16305 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .