AK8777B Hall Effec IC for Pulse Encoders Overview The AK8777B is a Hall effec lach which deecs boh verical and horizonal (perpendicular and parallel o he marking side of he package) magneic field a he same ime. The oupu OUTA and OUTB are swiched according o he verical and horizonal magneic fields applied o he device. The AK8777B is for use in he incremenal pulse encoders or roaional deecion sysems. Feaures o 4. o 24V supply volage operaion o Sensiiviy (Verical, Horizonal) : ±1.7mT(Typ.) o Two oupus : OUTA (deecs verical magneic field), OUTB (deecs horizonal magneic field) o Small package: SOP-6pin o Halogen free 1
Block Diagram VDD REGULATOR BIAS OSC.1µF VSS VREG HE_DRIVE TIMING LOGIC OUTA CHOPPER_SW CHOP_AMP COMP LATCH & LOGIC OUTB HALL SENSORS Figure 1. Block diagram Circui Configuraion Block REGULATOR HALL SENSORS CHOPPER_SW CHOP_AMP COMP BIAS HE_DRIVE OSC TIMING LOGIC LATCH & LOGIC Table 1. Circui configuraion Funcion Generae inernal operaing volage. Two Hall elemens fabricaed by CMOS process. Perform chopping in order o cancel he offse of Hall sensor. Amplifies wo Hall sensor oupu volage wih summaion and subracion circui. Hyseresis comparaor. Generaes bias curren o inernal circuis. Generaes bias curren for Hall sensors. Generaes operaing clock. Generaes iming signal for inernal circuis. Logical circuis and open drain driver. 2
Pin/Funcion Table 2. Descripion of pin name and funcion Pin No. Pin name I/O Funcion Noe 1 VDD Power supply pin 2 TAB (TAB pin) 3 OUTA O Oupu A pin. Relaing o he verical magneic field. Open drain 4 OUTB O Oupu B pin. Relaing o he horizonal magneic field. Open drain 5 TAB (TAB pin) 6 VSS Ground pin Noe) TAB pins should be conneced o VSS. Absolue Maximum Raings Table 3. Absolue maximum raings Parameer Symbol Min. Max. Uni Noe Supply volage V DD.3 +32 V VSS=V Oupu volage V OUT.3 +32 V OUTA,OUTB pin VSS=V Oupu curren I OUT 2 ma OUTA,OUTB pin Sorage emperaure T STG 55 +15 C Noe) Sress beyond hese lised values may cause permanen damage o he device. Recommended Operaing Condiions Table 4. Recommended operaing condiions Parameer Symbol Min. Typ. Max. Uni Supply volage V DD 4. 12. 24. V Oupu curren I SINK 15 ma Operaing emperaure Ta 4 +125 C 3
Elecrical Characerisics Table 5. Elecrical characerisics a V DD =4. o 24.V, Ta= 4 o +125 C Parameer Symbol Min. Typ. Max. Uni Noe Curren consumpion I DD 1.4 3. 5.6 ma Oupu sauraion volage V SAT.4 V OUTA,OUTB pin, I SINK = 15mA Oupu leak curren I LEAK 1 µa OUTA, OUTB =V DD Oupu refresh period T P 12. 16.7 3.5 µs Magneic Characerisics Table 6. Magneic characerisics a V DD =4. o 24.V, Ta= 4 o +125 C Parameer Symbol Min. Typ. Max. Uni Noe Operaing poin of verical magneic field BopV.1 1.7 4. mt (*1) Releasing poin of verical magneic field BrpV 4. 1.7.1 mt (*1) Operaing poin of horizonal magneic field BopH.1 1.7 4. mt (*2) Operaing poin of horizonal magneic field BrpH 4. 1.7.1 mt (*2) Hyseresis BhV, BhH 1.5 3.4 6.8 mt (*1), (*2) (*1) Horizonal magneic flux densiy is zero. (*2) Verical magneic flux densiy is zero. 4
Operaional Characerisics The signal OUTA swiches Low sae (ON) when he magneic field perpendicular o he marking side of he package exceeds BopV. When he magneic field is reduces below BrpV, he OUTA goes High sae (OFF). Oherwise; ha is, in case of he magneic field srengh is greaer han BrpV and smaller han BopV; OUTA keeps is saus. S Signal OUTA Top(Marking) Boom BrpV BhV BopV N N S Figure 2. Swiching behavior of he signal OUTA when verical magneic field is applied The signal OUTB swiches Low sae (ON) when he magneic field parallel o he marking side of he package exceeds BopH. When he magneic field is reduces below BrpH, he OUTB goes High sae (OFF). Oherwise; ha is, in case of he magneic field srengh is greaer han BrpH and smaller han BopH; OUTB keeps is saus. Line Marking Signal OUTB Top(Marking) VSS pin N S BrpH BhH BopH OUTB pin N S Boom Figure 3. Swiching behavior of he signal OUTB when horizonal magneic field is applied 5
Funcional Timing Sampling cycle T P : 16.7μs(Typ.) Verical M.F.D. BopV BrpV Horizonal M.F.D. BopH BrpH signal OUTA signal OUTB Sampling Cycle Sampling Cycle M.F.D. M.F.D. BopV, BopH BrpV, BrpH BopV, BopH BrpV, BrpH signal OUTA, signal OUTB 6μs(Typ.) Figure 4. Timing diagram 6μs(Typ.) signal OUTA, 5%V DD signal OUTB 5%V DD *M.F.D. is Magneic Flux Densiy. Noe) V DD =12.V, R L =1kΩ, C L =2pF 6
Typical Characerisic Daa (for reference) Figure 5. Temperaure dependence of sensiiviy Figure 6. Temperaure dependence of curren consumpion 7
Package 6 5 4 1 2 3 1:VDD 2:TAB 3:OUTA 4:OUTB 5:TAB 6:VSS Uni in mm Figure 7. Package dimensions Noe 1) The cener of he sensiive area is locaed wihin he φ.3mm circle. Noe 2) Coplanariy: The differences beween sandoff of erminals are max..1mm. Noe 3) The sensor par is locaed.71mm(typ.) from marking surface. Maerial of erminals: Cu alloy Maerial of plaing for erminals: Sn 1% Thickness of plaing for erminals:1μm (Typ.) 8
Marking Line Marking 6 5 4 5YWWL 1 2 3 Marking is performed by laser Produc name : 5 (AK8777B) Dae code : YWWL Y : Manufacured year WW : Manufacured week L : Lo Figure 8. Marking Recommended Exernal Circui V DD 1kΩ GND Oupu (OUTB) 6 5 4 V DD V DD.1μF Top View 1 2 3 1kΩ Oupu (OUTA) Figure 9. Recommended exernal circui 9
IMPORTANT NOTICE These producs and heir specificaions are subjec o change wihou noice. When you consider any use or applicaion of hese producs, please make inquiries he sales office of Asahi Kasei Microdevices Corporaion (AKM) or auhorized disribuors as o curren saus of he producs. Descripions of exernal circuis, applicaion circuis, sofware and oher relaed informaion conained in his documen are provided only o illusrae he operaion and applicaion examples of he semiconducor producs. You are fully responsible for he incorporaion of hese exernal circuis, applicaion circuis, sofware and oher relaed informaion in he design of your equipmens. AKM assumes no responsibiliy for any losses incurred by you or hird paries arising from he use of hese informaion herein. AKM assumes no liabiliy for infringemen of any paen, inellecual propery, or oher righs in he applicaion or use of such informaion conained herein. Any expor of hese producs, or devices or sysems conaining hem, may require an expor license or oher official approval under he law and regulaions of he counry of expor peraining o cusoms and ariffs, currency exchange, or sraegic maerials. AKM producs are neiher inended nor auhorized for use as criical componens Noe1) in any safey, life suppor, or oher hazard relaed device or sysem Noe2), and AKM assumes no responsibiliy for such use, excep for he use approved wih he express wrien consen by Represenaive Direcor of AKM. As used here: Noe1) A criical componen is one whose failure o funcion or perform may reasonably be expeced o resul, wheher direcly or indirecly, in he loss of he safey or effeciveness of he device or sysem conaining i, and which mus herefore mee very high sandards of performance and reliabiliy. Noe2) A hazard relaed device or sysem is one designed or inended for life suppor or mainenance of safey or for applicaions in medicine, aerospace, nuclear energy, or oher fields, in which is failure o funcion or perform may reasonably be expeced o resul in loss of life or in significan injury or damage o person or propery. I is he responsibiliy of he buyer or disribuor of AKM producs, who disribues, disposes of, or oherwise places he produc wih a hird pary, o noify such hird pary in advance of he above conen and condiions, and he buyer or disribuor agrees o assume any and all responsibiliy and liabiliy for and hold AKM harmless from any and all claims arising from he use of said produc in he absence of such noificaion. 1