AK8779B Hall Effec IC for Pulse Encoders 1. General Descripion The AK8779B is a Hall effec lach which deecs boh verical and horizonal (perpendicular and parallel o he marked side of he package) magneic fields a he same ime. The OUTA and OUTB oupus are swiched according o he verical and horizonal magneic fields applied o he device. The AK8779B is for use in he incremenal pulse encoders or roaional deecion sysems. 2. Feaures Supply Volage: 3.8 o 24V Operaion Temperaure: 4 o 15ºC Sensiiviy (Verical): ±2.mT(Typ.), ±4.mT(Max.) Sensiiviy (Horizonal): ±2.mT(Typ.), ±4.mT(Max.) Two Oupus: OUTA (verical magneic field deecion) OUTB (horizonal magneic field deecion) Package: 6-pin SOP Type (RoHS Complian, Halogen free) 15134-E-2 215/1-1 -
3. Table of Conens 1. General Descripion... 1 2. Feaures... 1 3. Table of Conens... 2 4. Block Diagram and Funcions... 3 4.1. Block Diagram... 3 4.2. Funcions... 3 5. Pin Configuraions and Funcions... 4 5.1. Pin Configuraions... 4 5.2. Funcions... 4 6. Absolue Maximum Raings... 4 7. Recommended Operaing Condiions... 5 8. Elecrical Characerisics... 5 9. Magneic Characerisics... 5 1. Operaing Characerisics... 6 1.1. Definiion of Verical Magneic Field... 6 1.2. Definiion of Horizonal Magneic Field... 6 1.3. Behaviors of OUTA and OUTB Signals when a Roaing Magneic Field Is Applied on The AK8779B... 7 11. Funcional Timing... 8 12. Recommended Exernal Circui... 9 13. Typical Characerisics Daa (for reference)... 1 14. Package... 11 14.1. Ouline Dimensions... 11 14.2. Maerial of Terminals... 11 14.3. Land Paern... 12 14.4. Marking... 12 IMPORTANT NOTICE... 13 15134-E-2 215/1-2 -
CHOPPER_SW LATCH & LOGIC.1mF [AK8779B] 4. Block Diagram and Funcions 4.1. Block Diagram VDD REGULATOR BIAS OSC VSS VREG HE_DRIVE TIMING LOGIC OUTA CHOP_AMP COMP OUTB HALL SENSORS Figure 1. AK8779B Block Diagram 4.2. Funcions Table 1. Circui configuraion Block Name Funcion REGULATOR Generae inernal operaing volage. HALL SENSORS Two Hall elemens fabricaed by CMOS process. CHOPPER_SW Hall sensor drive swich. Perform chopping in order o cancel he offse of Hall sensor. CHOP_AMP Amplify wo Hall sensor oupu volages wih summaion and subracion circui. COMP Hyseresis comparaor. BIAS Generae bias curren o inernal circuis. HE_DRIVE Generae bias curren for Hall sensors. OSC Generae operaional clock. TIMING LOGIC Generae iming signal for inernal circuis. LATCH & LOGIC Logical circuis and open drain driver. 15134-E-2 215/1-3 -
5. Pin Configuraions and Funcions 5.1. Pin Configuraions Line Marking 6 5 4 1 2 3 Figure 2. Pin Layou 5.2. Funcions Table 2. Descripion of pin name and funcion Pin No. Pin Name I/O Funcion Descripion 1 OUTB O Oupu pin (relaing o he horizonal magneic field) Open Drain 2 TAB - (TAB pin) (* 1) 3 OUTA O Oupu pin (relaing o he verical magneic field) Open Drain 4 VDD - Power Supply pin 5 TAB - (TAB pin) (* 1) 6 VSS - Ground pin (GND) * 1. The TAB pin should be conneced o he VSS pin. 6. Absolue Maximum Raings Table 3. Absolue maximum raings Parameer Symbol Min. Max. Uni Descripion Supply Volage V DD.3 32 V VSS = V Oupu Volage V OUT.3 32 V OUTA pin, OUTB pin VSS = V Oupu Curren I SINK 2 ma OUTA pin, OUTB pin Sorage Temperaure T STG 55 15 ºC Operaion a or beyond hese limis may resul in permanen damage o he device. Normal operaion is no guaraneed a hese exremes. 15134-E-2 215/1-4 -
7. Recommended Operaing Condiions Table 4. Recommended operaing condiions Parameer Symbol Min. Typ. Max. Uni Supply Volage V DD 3.8 12 24 V Oupu Curren I SINK 15 ma Operaion Temperaure Ta 4 15 ºC 8. Elecrical Characerisics Table 5. Elecrical characerisics a V DD = 3.8 o 24V, Ta = 4 o 15ºC Parameer Symbol Min. Typ. Max. Uni Descripion Curren Consumpion I DD 1.7 3.5 6.2 ma V DD = 3.8 o 24V Curren Consumpion (2) I DD2 1.7 3.5 6. ma V DD = 3.8 o 18V Oupu Sauraion Volage V SAT.4 V OUTA pin, OUTB pin, I SINK = 15mA Oupu Leak Curren I LEAK 1 µa OUTA, OUTB pin = V DD Oupu Refresh Period Tp 5. 8.3 16.7 µs 9. Magneic Characerisics Table 6. Magneic characerisics a V DD = 3.8 o 24V, Ta = 4 o 15ºC Parameer Symbol Min. Typ. Max. Uni Descripion Operae poin of verical magneic field BopV.5 2. 4. mt (* 2) Release poin of verical magneic field BrpV 4. 2..5 mt (* 2) Operae poin of horizonal magneic field BopH.5 2. 4. mt (* 3) Release poin of horizonal magneic field BrpH 4. 2..5 mt (* 3) Hyseresis BhV, BhH 2. 4. 6.4 mt (* 2, * 3, * 4) Magneic offse BoffV, BoffH 1.1. +1.1 mt (* 2, * 3, * 5) * 2. Horizonal magneic flux densiy is zero. * 3. Verical magneic flux densiy is zero * 4. Bh = Bop Brp * 5. Boff = (Bop + Brp) / 2 OUTA/OUTB signal Bh/2 Bh/2 N Brp S Boff Bop B Figure 3. Definiion of Bh and Boff 15134-E-2 215/1-5 -
1.1. Definiion of Verical Magneic Field 1. Operaing Characerisics The OUTA signal swiches L (ON) when he magneic field perpendicular o he marking side of he package exceeds BopV. When he magneic field is reduced below BrpV, he OUTA goes H (OFF). Oherwise; ha is, in case of he magneic field srengh is greaer han BrpV and smaller han BopV; OUTA keeps is saus. Line Marking OUTA signal BhV N BrpV BopV S B Figure 4. Swiching behavior of OUTA signal when verical magneic field is applied 1.2. Definiion of Horizonal Magneic Field The OUTB signal swiches L (ON) when he magneic field parallel o he marking side of he package exceeds BopH. When he magneic field is reduced below BrpH, he OUTB goes H (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 OUTB signal BhH N BrpH BopH S B Figure 5. Swiching behavior of he OUTB signal when horizonal magneic field is applied 15134-E-2 215/1-6 -
1.3. Behaviors of OUTA and OUTB Signals when a Roaing Magneic Field Is Applied on The AK8779B Direcion chenged Direcion chenged Verical M. F. D. BopV BrpV BopH Horizonal M. F. D. BrpH Supply Volage V DD OUTA Signal (Verical) OUTB Signal (Horizonal) Undefined ("H" or "L") Figure 6. Behaviors of OUTA and OUTB Signals wih Roaing Magneic Field * M.F.D. = Magneic Flux Densiy * The indeerminae oupu sae appears only in he powering up of his device. 15134-E-2 215/1-7 -
11. Funcional Timing Sampling Cycle Tp: 8.3μs (Typ.) Verical M.F.D. BopV BrpV Horizonal M.F.D. BopH BrpH OUTA Signal (Verical) OUTB Signal (Horizonal) Figure 7. Oupu Signal Timing Diagram Sampling Cycle M.F.D Sampling Cycle M.F.D BopV, BopH BrpV, BrpH BopV, BopH BrpV, BrpH OUTA Signal OUTB Signal 4μs(Typ.) 4μs(Typ.) OUTA Signal 5%V DD OUTB Signal 5%V DD Figure 8. Oupu Signal Timing Diagram (in deail) * M.F.D. = Magneic Flux Densiy * V DD = 12V, R L = 1kΩ, C L = 2pF 15134-E-2 215/1-8 -
1kΩ 1kΩ [AK8779B] 12. Recommended Exernal Circui.1μF V DD 6 5 4 GND VSS VDD Top View OUTB OUTA 1 2 3 Oupu (OUTA) Oupu (OUTB) Figure 9. Recommended Exernal Circui 15134-E-2 215/1-9 -
I DD [ma] I DD [ma] BopV, BrpV [mt] BopH, BrpH [mt] BopV, BrpV [mt] BopH, BrpH [mt] BopV, BrpV [mt] BopH, BrpH [mt] [AK8779B] 13. Typical Characerisics Daa (for reference) 4 3 BopV BrpV 4 3 BopH BrpH 2 2 1 1-1 -1-2 -2-3 -3-4 -5-25 25 5 75 1 125 15 Ambien emperaure Ta [ ] BopV, BrpV vs. Ta (V DD = 3.8V) -4-5 -25 25 5 75 1 125 15 Ambien emperaure Ta [ ] BopH, BrpH vs. Ta (V DD = 3.8V) 4 3 BopV BrpV 4 3 BopH BrpH 2 2 1 1-1 -1-2 -2-3 -3-4 -5-25 25 5 75 1 125 15 Ambien emperaure Ta [ ] BopV, BrpV vs. Ta (V DD = 12V) -4-5 -25 25 5 75 1 125 15 Ambien emperaure Ta [ ] BopH, BrpH vs. Ta (V DD = 12V) 4 3 BopV BrpV 4 3 BopH BrpH 2 2 1 1-1 -1-2 -2-3 -3-4 -5-25 25 5 75 1 125 15 Ambien emperaure Ta [ ] BopV, BrpV vs. Ta (V DD = 24V) -4-5 -25 25 5 75 1 125 15 Ambien emperaure Ta [ ] BopH, BrpH vs. Ta (V DD = 24V) Figure 1. Temperaure Dependence of Bop, Brp 5. 4.5 4. 3.5 3. 2.5 2. 1.5 1..5. 3.8V 12V 24V -5-25 25 5 75 1 125 15 Ambien emperaure Ta [ ] I DD vs. Ta (in various V DD ) 5. 4.5 4. 3.5 3. 2.5 2. 1.5 1..5. 2 4 6 8 1 12 14 16 18 2 22 24 26 V DD [V] I DD vs. V DD (in various Ta) 4 25 5 15 Figure 11. Temperaure Dependence of Curren Consumpion 15134-E-2 215/1-1 -
14. Package 14.1. Ouline Dimensions 6-pin SOP (Uni: mm) Figure 12. Ouline Dimensions * The cener of he sensiive are is locaed wihin a φ.3mm circle. * Lead flaness: The sandoff differences among erminals are Max..1mm. * The sensor par is locaed a.71mm (Typ.) deep from he marked surface. 14.2. Maerial of Terminals Maerial: Cu alloy Plaing: Sn 1% Thickness: 1µm (Typ.) 15134-E-2 215/1-11 -
14.3. Land Paern Uni: mm Figure 13. Land Paern 14.4. Marking Line Marking 6 5 4 Marking is performed by laser. BYWWL 1 2 3 Produc name Dae code B(AK8779B) YWWL Y: Manufacured Year WW: Manufacured Week L: Lo Number Figure 14. Marking 15134-E-2 215/1-12 -
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