Preliminary AK8776. Overview. Features
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- Corey Amy Campbell
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1 AK8776 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 and oupus he pulse (F) and roaional direcion (D).The resul of hall effec lach operaion in verical and horizonal magneic field is held as inernal signal A and B. These inernal A, B signals are processed by implemened logical circui and F, D are sen ou. AK8776 is for use in porable devices which uses roaional deecion sysem or incremenal pulse encoder such as jog dial uilized for inpu devices. 1.6 o 5.5V operaion Bop, Brp(Verical,Horizonal) ±1.5mT, Highly sensiive Low power operaion : Average DD =3V Two Oupu: F-Oupu (Pulse coun), D-Oupu (Direcion of roaion) Small package: SOP-4pin Overview Feaures AK8776 Hall IC for Pulse Encoder 1
2 0.1μF VDD VSS Block Hall sensors Chopper Swich CHOP_AMP COMP BIAS HE Drive OSC Timing logic Hall Sensors Lach & Logic /Oupu buffer Chopper Swich Figure 1. Block diagram Table 1.Circui configuraion Funcion 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. Block diagram Bias HE Drive CHOP_AMP Circui configuraion Generaes bias curren o oher circuis.. Generaes bias curren for Hall sensors Generaes operaing clock. Generaes iming signal required for Chopper SW, AMP and COMP Logical circuis and CMOS oupu buffer OSC Timing Logic COMP Lach& Logic /Oupu Buffer 2 F D
3 Table 2.Descripion of pin name and funcion Pin No. Pin mane I/O Noe 1 VDD - Power supply pin 2 F O Oupu F (Pulse)pin 3 D O Oupu D (Direcion) pin 4 VSS - Ground pin Pin/Funcion Absolue Maximum Raings Table 3.Absolue maximum raings Parameer Symbol Min. Max. Uni Noe Power supply volage V DD V Oupu curren I OUT ma F,D pin Sorage emperaure T STG 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 Power supply volage V DD V Operaing emperaure Ta C Elecrical Characerisics Table 5.Elecrical characerisics (Ta=25 C, V DD = 3.0V unless oherwise noed) Parameer Symbol Min. Typ. Max. Uni Noe Curren consumpion I DD ma Operaional, Average High level oupu Volage V OH V DD -0.4 V F,D pin, I OUT = -0.5mA Low level oupu Volage V OL 0.4 V F,D pin, I OUT = +0.5mA Pulse drive period T PD ms (*7) Pulse drive duraion ime T PD ms (*1),(*7) (*1) Noe: Inernal daa is deermined jus before he inernal circui urns off. and afer 6.1μs (yp.), he oupu changes. 3
4 The oupu F and D is processed signals from inernal signal A and B which is deermined by he applied magneic field and hreshold level BopV, BrpV, BopH and BrpH as follows. Table 6.Magneic characerisics(ta = 25 C, V DD = 3.0V unless ohewise noed) Parameer Symbol Min. Typ. Max. Uni Noe Verical magneic field operaing poin BopV mt (*2),(*4) Verical magneic field releasing poin BrpV mt (*2),(*4) Horizonal magneic field operaing poin BopH mt (*3),(*5) Horizonal magneic field releasing poin BrpH mt (*3),(*5) Hyseresis BhV, BhH 3.0 mt (*2,)(*3),(*4),(*5) (*2) Horizonal magneic flux densiy is zero. (*3) Verical magneic flux densiy is zero. (*4) The magneic pole is applied verically facing he marking side of he package. The S pole is defined as posiive field. See Figure 2. Top(Marking) S N When a sufficien S pole magneic field is applied on AK8776, he inernal signal A ransiions o he L sae. And i is kep unil he N pole sufficien magneic field is applied and laches he signal A o H sae. Those hreshold magneic flux densiy levels are defined in Table 6. Magneic characerisics Boom Brp N [mt] Oupu BhV Figure 2.Swiching behavior of inernal signal A when verical magneic field is applied Bop S [mt] 4
5 (*5) The magneic pole is applied horizonally from he VDD-F pin side o VSS-D pin side of he package. The S pole is defined as posiive field. See Figure 3. Top(Marking) N Boom When a sufficien S pole magneic field is applied on AK8776, he inernal signal B ransiions o he L sae. And i is kep unil he N pole sufficien magneic field is applied and laches he signal B o H sae. Those hreshold magneic flux densiy levels are defined in Table 6. Line marking S D pin BrpV N [mt] Oupu BhV Figure 3.Swiching behavior of inernal signal B when horizonal magneic field is applied VSS pin BopV S [mt] 5
6 (*6)The relaion of inernal signal A,B and F,D oupu signal F signal (pulse) is correspond o he EX-NOR resul of inernal signal A and B. And D signal (direcion) is given by looking up he sae of signal A (B) a he rising/falling edge of B (A). Verical M.F.D.* Horizonal M.F.D. Supply Volage V DD Inernal signal A (Verical) Inernal signal B (Horizonal) F (Pulse) D (Direcion) BopV BrpV BopH BrpH *M.F.D. is Magneic Flux Densiy. Undefined (H or L) F,D signal is deermined Figure 4. Relaionship of inernal signal (A,B)and oupu signal F,D Noe) Signals including D signal are deermined a he firs negaive edge of F signal. The secion which he oupu saus is undefined appears only in he saring up of his device. The relaionship beween he inernal signal A,B and oupu signal F,D when he direcion of roaion of he magne is changed is shown in (*8). 6
7 (*7)Pulse drive behavior and ransiion iming of inernal signal A,B and oupu signal F Curren consumpion I DD ON (yp. 3.5mA) Verical M.F.D. Horizonal M.F.D. Inernal signal A (Verical) BopV BrpV BopH BrpH Inernal signal B (Horizonal) F (Pulse) T PD2 (yp. 24.4μs) 6.1μs(yp.) 6.1μs(yp.) Noe)V DD =3.0V. Oupu signal F,D and inernal signal A,B is synchronized. T PD1 (yp. 1.0ms) 6.1μs(yp.) 6.1μs(yp.) Figure 5.Timing char of curren consumpion and ransiion iming of inernal and oupu signal 7
8 (*8)The change of roaing direcion and D oupu behavior The ransiion of D (direcion) signal when he direcion of he roaion of he magneized roer is changed is shown in Figure 6. Verical M.F.D. Horizonal M.F.D. Supply volage V DD Inernal signal A (Verical) Inernal signal B (Horizonal) F (Pulse) D (Direcion) BopV BrpV BopH BrpH Direcion changed Direcion changed Figure 6.Oupu behaviors when he direcion of roaion is changed 8
9 (*9) The cener of he sensor is locaed wihin he f0.3mm circle. (*10) The olerances of dimensions wih no menions are ±0.1mm. (*11) Coplanariy: The differences beween sandoff of erminals are max. 0.1mm. (*12) The sensor par is locaed 0.4mm±0.1mm far from marking surface. 4 1 Maerial of erminals: Cu alloy Maerial of plaing for erminals: Sn 100% Thickness of plaing for erminals:10μm (yp.) Package 3 2 Marking センサ中心 (*8)~(*11) Figure 7.Package ouline Uni in mm 1. 1:VDD VDD 2. 2:F F 3. 3:D D 4. 4:VSS VSS 単位 mm 9
10 Line marking 4 1 JYML VSS 0.1μF VDD 3 2 Figure 8.Marking Marking Marking is performed by laser Produc name :J (AK8776) Dae code :YML Y:Las one digi of manufacured year(0 9) M:Manufacured monh(1 9,X,Y,Z) L:Lo(1 9,A Z) Recommended exernal circui 4 1 Top View Oupu (D signal) 3 2 Oupu (F signal) Figure 9.Recommended exernal circuis 10
11 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 EMD Corporaion (AKEMD) or auhorized disribuors as o curren saus of he producs. AKEMD assumes no liabiliy for infringemen of any paen, inellecual propery, or oher righs in he applicaion or use of any 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. AKEMD 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 AKEMD assumes no responsibiliy for such use, excep for he use approved wih he express wrien consen by AKEMD. 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 AKEMD 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 AKEMD harmless from any and all claims arising from he use of said produc in he absence of such noificaion. ASAHI KASEI EMD CORPORATION Headquaers Nishi-Shinjyuku Shinjyuku-ku,Tokyo ,Japan TEL FAX Osaka Office Dojimahama Kia-ku,Osaka ,Japan TEL FAX Europe Office Marke House,19/21 Marke Place,Wokingham,Berkshire,RG40 1AP,U.K. TEL : FAX : Shanghai Office Room2321,Shanghai Cenral Plaza,381 Huaihai Zhong Road,Shanghai ,Chaina TEL FAX Seoul Office 8h fi.,ktp B/D,27-2 Yoido-dong,Youngdungpo-gu,Seoul ,Korea TEL FAX AKM Semiconducor,Inc Wesern US Sales 1731 Technology Dr Suio 500 San Jose,CA95110,USA TEL FAX Easern US Sales 629 Bamford Road Cherry Hill,NJ 08003,USA TEL FAX hp:// Norh American Disribuor: GMW Associaes 955 Indusrial Rd, San Carlos, CA 94070, USA TEL FAX sales@gmw.com WEB
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