AK8779A Hall Effect IC for Pulse Encoders

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1 AK8779A Hall Effec IC for Pulse Encoders 1. General Descripion The AK8779A is a Hall effec lach which deecs boh verical magneic field and horizonal magneic field (perpendicular and parallel o he marked side of he package) a he same ime. The pulse oupu F and he direcion oupu D are swiched according o he verical and horizonal magneic fields applied o he device. The direcion is calculaed inernally and oupu D is swiched on a rising or falling edge of oupu F. The AK8779A 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: F (Pulse) D (Direcion) Package: 6-pin SOP (RoHS Complian, Halogen free) E-2 215/7-1 -

2 3. Table of Conens 1. General Descripion Feaures Table of Conens Block Diagram and Funcions Block Diagram Funcions Pin Configuraions and Funcions Pin Configuraions Funcions Absolue Maximum Raings Recommended Operaing Condiions Elecrical Characerisics Magneic Characerisics Magneic Field Deecion Definiion of Verical Magneic Field s Polariy Definiion of Horizonal Magneic Field s Polariy Behaviors of Inernal and Oupu Signals when a Roaing Magneic Field Is Applied on The AK8779A Operaional Timing Recommended Exernal Circui Typical Characerisics Daa (for reference) Package Ouline Dimensions Maerial of Terminals Land Paern Marking IMPORTANT NOTICE E-2 215/7-2 -

3 CHOPPER_SW LATCH & LOGIC.1mF [AK8779A] 4. Block Diagram and Funcions 4.1. Block Diagram VDD REGULATOR BIAS OSC VSS VREG HE_DRIVE TIMING LOGIC F CHOP_AMP COMP D HALL SENSORS Figure 1. AK8779A 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 E-2 215/7-3 -

4 5. Pin Configuraions and Funcions 5.1. Pin Configuraions Line Marking Figure 2. Pin Layou 5.2. Funcions Table 2. Descripion of pin name and funcion Pin No. Pin Name I/O Funcion Descripion 1 F O Oupu pin (relaing o he pulse oupu) Open Drain 2 TAB - (TAB pin) (* 1) 3 D O Oupu pin (relaing o he direcion oupu) Open Drain 4 VDD - Power supply pin 5 TAB - (TAB pin) (* 1) 6 VSS - Ground pin * 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 F pin, D pin VSS = V Oupu Curren I SINK 2 ma F pin, D pin Sorage Temperaure T STG ºC Operaion a or beyond hese limis may resul in permanen damage o he device. Normal operaion is no guaraneed a hese exremes E-2 215/7-4 -

5 7. Recommended Operaing Condiions Table 4. Recommended operaing condiions Parameer Symbol Min. Typ. Max. Uni Supply Volage V DD 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 ma V DD = 3.8 o 24V Curren Consumpion (2) I DD ma V DD = 3.8 o 18V Oupu Sauraion Volage V SAT.4 V F pin, D pin, I SINK = 15mA Oupu Leak Curren I LEAK 1 µa F, D = V DD Oupu Refresh Period Tp 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 mt (* 2) Release poin of verical magneic field BrpV mt (* 2) Operae poin of horizonal magneic field BopH mt (* 3) Release poin of horizonal magneic field BrpH mt (* 3) Hyseresis BhV, BhH mt (* 2, * 3, * 4) Magneic offse BoffV, BoffH 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 Inernal signal A/B Bh/2 Bh/2 N Brp S Boff Bop B Figure 3. Definiion of Bh and Boff E-2 215/7-5 -

1. Magneic Field Deecion 1.1. Definiion of Verical Magneic Field s Polariy The inernal signal A swiches L (ON) when he magneic field perpendicular o he marking side of he package exceeds BopV.

Oherwise; ha is, in case of he magneic field srengh is greaer han BrpV and smaller han BopV; he inernal signal A keeps is saus. Line Marking Inernal signal A BhV N BrpV BopV S B Figure 4.

6 1. Magneic Field Deecion 1.1. Definiion of Verical Magneic Field s Polariy The inernal signal A 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 inernal signal A goes H (OFF). Oherwise; ha is, in case of he magneic field srengh is greaer han BrpV and smaller han BopV; he inernal signal A keeps is saus. Line Marking Inernal signal A BhV N BrpV BopV S B Figure 4. Swiching behavior of he inernal signal A when verical magneic field is applied 1.2. Definiion of Horizonal Magneic Field s Polariy The inernal signal B 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 inernal signal B goes H (OFF). Oherwise; ha is, in case of he magneic field srengh is greaer han BrpH and smaller han BopH; he inernal signal B keeps is saus. Line Marking Inernal signal B BhH N BrpH BopH S B Figure 5. Swiching behavior of he inernal signal B when horizonal magneic field is applied E-2 215/7-6 -

7 1.3. Behaviors of Inernal and Oupu Signals when a Roaing Magneic Field Is Applied on The AK8779A The F signal (pulse) is correspond o he resul of EX-OR operaion of inernal signal A and B. The D signal (direcion) is calculaed by saus of inernal signal A and B. Direcion changed Direcion changed Verical M. F. D. BopV BrpV BopH Horizonaal M. F. D. BrpH Supply volage V DD Inernal signal A (Verical) Inernal signal B (Horizonal) F (Pulse) D (Direcion) Undefined ("H" or "L") F, D signal is deermined. Figure 6. Behaviors of Inernal Signal A, B and Oupu Signal F, D wih Roaing Magneic Field * M.F.D. = Magneic Flux Densiy * D signal is deermined afer one F signal pulse is sen ou. The indeerminae oupu sae appears only in he powering up of his device. * F and D signals are changed a he same ime E-2 215/7-7 -

8 11. Operaional Timing Sampling Cycle Tp: 8.3μs (Typ.) Verical M.F.D. BopV BrpV Horizonal M.F.D. BopH BrpH Inernal signal A (Verical) Inernal signal B (Horizonal) F (Pulse) Figure 7. Oupu Signal Timing Diagram Direcion changed Direcion changed Sampling Cycle M.F.D. Verical M.F.D. Horizonal M.F.D. BopV,BopH BrpV,BrpH 4μs(Typ.) 4μs(Typ.) 4μs(Typ.) 4μs(Typ.) F (Pulse) 5%V DD 4μs(Typ.) 4μs(Typ.) D (Direcion) 5%V DD * M.F.D. = Magneic Flux Densiy * V DD = 12V, R L = 1k, C L = 2pF Figure 8. Oupu Signal Timing Diagram (in deail) E-2 215/7-8 -

9 1kΩ 1kΩ [AK8779A] 12. Recommended Exernal Circui.1μF V DD GND VSS VDD Top View F D Oupu (D) Oupu (F) Figure 9. Recommended Exernal Circui E-2 215/7-9 -

10 I DD [ma] I DD [ma] BopV, BrpV [mt] BopH, BrpH [mt] BopV, BrpV [mt] BopH, BrpH [mt] BopV, BrpV [mt] BopH, BrpH [mt] [AK8779A] 13. Typical Characerisics Daa (for reference) 4 3 BopV BrpV 4 3 BopH BrpH Ambien emperaure Ta [ ] BopV, BrpV vs. Ta (V DD = 3.8V) Ambien emperaure Ta [ ] BopH, BrpH vs. Ta (V DD = 3.8V) 4 3 BopV BrpV 4 3 BopH BrpH Ambien emperaure Ta [ ] BopV, BrpV vs. Ta (V DD = 12V) Ambien emperaure Ta [ ] BopH, BrpH vs. Ta (V DD = 12V) 4 3 BopV BrpV 4 3 BopH BrpH Ambien emperaure Ta [ ] BopV, BrpV vs. Ta (V DD = 24V) Ambien emperaure Ta [ ] BopH, BrpH vs. Ta (V DD = 24V) Figure 1. Temperaure Dependence of Bop, Brp V 12V 24V Ambien emperaure Ta [ ] I DD vs. Ta (in various V DD ) V DD [V] I DD vs. V DD (in various Ta) Figure 11. Temperaure Dependence of Curren Consumpion E-2 215/7-1 -

11 14. Package Ouline Dimensions 6-pin SOP (Uni: mm) Figure 12. Ouline Dimensions * The cener of he sensiive area 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 Maerial of Terminals Maerial: Cu alloy Plaing: Sn 1% Thickness: 1µm (Typ.) E-2 215/7-11 -

12 14.3. Land Paern Uni: mm Figure 13. Land Paern Marking Line Marking Marking is performed by laser AYWWL Produc name Dae code A(AK8779A) YWWL Y: Manufacured Year WW: Manufacured Week L: Lo Number Figure 14. Marking E-2 215/7-12 -

13 IMPORTANT NOTICE. Asahi Kasei Microdevices Corporaion ( AKM ) reserves he righ o make changes o he informaion conained in his documen wihou noice. When you consider any use or applicaion of AKM produc sipulaed in his documen ( Produc ), please make inquiries he sales office of AKM or auhorized disribuors as o curren saus of he Producs. 1. All informaion included in his documen are provided only o illusrae he operaion and applicaion examples of AKM Producs. AKM neiher makes warranies or represenaions wih respec o he accuracy or compleeness of he informaion conained in his documen nor grans any license o any inellecual propery righs or any oher righs of AKM or any hird pary wih respec o he informaion in his documen. You are fully responsible for use of such informaion conained in his documen in your produc design or applicaions. AKM ASSUMES NO LIABILITY FOR ANY LOSSES INCURRED BY YOU OR THIRD PARTIES ARISING FROM THE USE OF SUCH INFORMATION IN YOUR PRODUCT DESIGN OR APPLICATIONS. 2. The Produc is neiher inended nor warraned for use in equipmen or sysems ha require exraordinarily high levels of qualiy and/or reliabiliy and/or a malfuncion or failure of which may cause loss of human life, bodily injury, serious propery damage or serious public impac, including bu no limied o, equipmen used in nuclear faciliies, equipmen used in he aerospace indusry, medical equipmen, equipmen used for auomobiles, rains, ships and oher ransporaion, raffic signaling equipmen, equipmen used o conrol combusions or explosions, safey devices, elevaors and escalaors, devices relaed o elecric power, and equipmen used in finance-relaed fields. Do no use Produc for he above use unless specifically agreed by AKM in wriing. 3. Though AKM works coninually o improve he Produc s qualiy and reliabiliy, you are responsible for complying wih safey sandards and for providing adequae designs and safeguards for your hardware, sofware and sysems which minimize risk and avoid siuaions in which a malfuncion or failure of he Produc could cause loss of human life, bodily injury or damage o propery, including daa loss or corrupion. 4. Do no use or oherwise make available he Produc or relaed echnology or any informaion conained in his documen for any miliary purposes, including wihou limiaion, for he design, developmen, use, sockpiling or manufacuring of nuclear, chemical, or biological weapons or missile echnology producs (mass desrucion weapons). When exporing he Producs or relaed echnology or any informaion conained in his documen, you should comply wih he applicable expor conrol laws and regulaions and follow he procedures required by such laws and regulaions. The Producs and relaed echnology may no be used for or incorporaed ino any producs or sysems whose manufacure, use, or sale is prohibied under any applicable domesic or foreign laws or regulaions. 5. Please conac AKM sales represenaive for deails as o environmenal maers such as he RoHS compaibiliy of he Produc. Please use he Produc in compliance wih all applicable laws and regulaions ha regulae he inclusion or use of conrolled subsances, including wihou limiaion, he EU RoHS Direcive. AKM assumes no liabiliy for damages or losses occurring as a resul of noncompliance wih applicable laws and regulaions. 6. Resale of he Produc wih provisions differen from he saemen and/or echnical feaures se forh in his documen shall immediaely void any warrany graned by AKM for he Produc and shall no creae or exend in any manner whasoever, any liabiliy of AKM. 7. This documen may no be reproduced or duplicaed, in any form, in whole or in par, wihou prior wrien consen of AKM E-2 215/7-13 -

AK8779B Hall Effect IC for Pulse Encoders

AK8779B Hall Effect IC for Pulse Encoders 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