[ak877 7b ] m s 1465 - e - 00 september 2012 1 the ak877 7 b is a h all effect latch which detects both vertical and horizontal (perpendicular and parallel to the marking side of the package) magnetic field at the same time . the output outa and outb are switched according to the vertical and horizontal magnetic fields applied to the device . the ak877 7 b is for use in the incremental pulse encoders or rotational detection system s . ? 4.0 to 24 v supply voltage operation ? sensitivity (vertical , horizontal) : 1.7 mt (typ.) ? two o utput s : outa ( dete cts v ertical magnetic field ), outb ( detects h orizontal magnetic field ) ? small package: sop - 6 pin ? halogen free ak877 7b h h a a l l l l e e f f f f e e c c t t i i c c f f o o r r p p u u l l s s e e e e n n c c o o d d e e r r s s features overview
[ak877 7b ] m s 1465 - e - 00 september 2012 2 figure 1. block d iagram table 1 . circuit configuration block function regulator generate internal operati ng voltage. h all sensors two hall elements fabricated by cmos process . c hopper_sw perform c hopping in order to cancel the offset of hall sensor . chop_amp amplifies two hall sensor output voltage with summation and subtraction circuit . comp hysteresis c omparator. bias generates bias current to internal circuits. he _drive generates bias current for hall sensors . osc generates operating clock. t iming logic generates timing signal for internal circuits . latch & logic logical circuits and o pen drain dri ver . block d iagram circuit c onfiguration chopper_sw latch & logic regulator bias he_drive osc timing logic chop_amp comp vreg vdd vss outa outb hall sensors 0.1 m f
[ak877 7b ] m s 1465 - e - 00 september 2012 3 table 2 . description of pin name and function pin no. pin n a m e i/o function note 1 vdd power supply pin 2 tab (tab pin) 3 outa o output a pin . relating to the vertical magnetic field. open d rain 4 outb o output b pin . relating to th e horizontal magnetic field. open d rain 5 tab (tab pin) 6 vss ground pin note) tab pins should be connected to vss. t able 3. absolute maximum ratings parameter symbol min. max. unit note s upply voltage v dd ? o ut ? out 20 ma outa , outb pin storage temperature t stg ? ? table 4 . r ecommended operating conditions parameter symbol min. typ. max. unit s upply voltage v dd 4.0 12 .0 24.0 v output current i sink 15 ma operating temperature ta ? ? absolute maximum ratings recommended o perating c o nditions pin/fun ction
[ak877 7b ] m s 1465 - e - 00 september 2012 4 table 5. electrical characteristics at v dd =4.0 to 24.0v, ta= ? 40 to +125 ? c parameter symbol min. typ. max. unit note current consumption i dd 1.4 3.0 5.6 m a o utput saturation v oltage v sat 0.4 v outa , outb pin, i sink = 1 5ma output leak curre n t i leak 10 m dd output refresh period t p 12.0 16.7 30.5 m table 6. magnetic characteristics at v dd =4.0 to 24.0v, ta= ? 40 to +125 ? c parameter symbol min. typ. max. unit note operating point of v ertical magnetic field bopv 0.1 1.7 4.0 mt (* 1 ) r eleasing point of v ertical magnetic field brpv ? ? ? ? ? ? electrical characteristics magnetic c hara cteristics
[ak877 7b ] m s 1465 - e - 00 september 2012 5 the signal outa switches ? low ? state (on) when the magnetic field perpendicular to the marking s ide of the package exceeds bopv. when the magnetic field is reduces below brpv, the outa goes ? high ? state (off). otherwise ; that is, in ca se of the magnetic field strength is greater than brpv and smaller than bopv ; outa ke eps its status . the signal outb switches ? low ? state (on) when the magnetic field p arallel to the marking side of the package exceeds boph. when the magn etic field is reduces below brph, the outb goes ? high ? state (off). otherwise ; that is, in case of the magnetic field strength is greater than brph and smaller than boph; outb keeps its status. bhv signal outa bopv brp v s n 0 figure 2. switching behavior of the signal out a w hen vertical magnetic field is applied bh h signal outb bop h brp h s n 0 figure 3. switching behavior of the signal ou t b when horizontal magnetic field is applied operational c hara cteristics s n top(marking) b ottom s n top(m a rking) line marking bottom outb pin vss pin
[ak877 7b ] m s 1465 - e - 00 september 2012 6 *m.f.d. is magnetic flux density . note ) v dd = 12 .0v , r l =10k ? , c l =20pf figure 4 . timing diagram functional timing t 6s(typ.) bopv, boph signal outa, signal outb t 6s(typ.) m.f.d. m.f.d. sampling cycle sampling cycle t t 0 0 t t brpv, brph bopv, boph brpv, brph 50%v dd 50%v dd signal outa, signal outb 0 0 vertical m.f.d. horizontal m.f.d. bopv brpv 0 sampling cycle signal outa signal outb boph brph 0 t p : 16.7 s(typ.) t t t t t 0 0
[ak877 7b ] m s 1465 - e - 00 september 2012 7 typical characteristic data (for reference) figure 5 . temperature dependence of sensitivity figure 6 . temperature dependence of current consumption
[ak877 7b ] m s 1465 - e - 00 september 2012 8 note 1 ) the center of the sens itive area is located within the ? 0.3mm circle. note 2 ) copla narity: the differences between standoff of terminals are max. 0.1mm. note 3) the sensor part is located 0. 7 1m m (typ.) fr om mar king surface. material of terminals cu alloy material of plating for terminals sn 100 thickness of plating for terminals 10m ( t yp.) package figure 7 . package dimensions 1 2 3 6 5 4 1:vdd 2:tab 3:ou ta 4:outb 5:tab 6:vss unit in mm
[ak877 7b ] m s 1465 - e - 00 september 2012 9 figure 8 . marking marking is performed by laser product name : 5 (ak877 7 b ) date code : y wwl y : m anufactured year ww : manufactured week l : lot marking figure 9 . recommended external circuit recommended e xternal c ircuit line marking 6 5 4 1 2 3 5ywwl gnd v dd 6 5 4 1 2 3 top view 0.1 f v dd v dd 10k 10k output (outa) output (outb)
[ak877 7b ] m s 1465 - e - 00 september 2012 10 importan t notice ? these products and their specifications are subject to change without notice. when you consider any use or application of these products, please make inquiries the sales office of asahi kasei microdevices corporation (akm) or authorized distribu tors as to current status of the products. ? descriptions of external circuits, application circuits, software and other related information contained in this document are provided only to illustrate the operation and applic ation examples of the semiconducto r products. you are fully responsible for the incorporation of these external circuits, application circuits, software and other related information in the design of your equipments. akm assumes no responsibility for any losses incurred by you or third par ties arising from the use of these information herein. akm assumes no liability for infringement of any patent, intellectual property, or other rights in the application or use of such information contained herein. ? any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. ? akm products are neither intended nor authorized for use as critical components note1) in any safety, life support, or other hazard related device or system note2) , and akm assumes no responsibility for such use, except for the use approved with the express written consent by representative dire ctor of akm. as used here: note1) a critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and w hich must therefore meet very high standards of performance and reliability. note2) a hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. ? it is the responsibility of the buyer or distributor of akm products, who distributes, dispo ses of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold akm harmless from any and all claims arising from the use of said product in the absence of such notification.
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