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[ak877 8b ] ms 1466 - e - 00 september 2012 1 the ak877 8b is a h all effect latch which detects both vertical magnetic field and horizontal magnetic field ( perpendicular and parallel to the marking side of the package) at the same time . the pulse output f and direction output d are switc hed according to the vertical and horizontal magnetic fields applied to the device. the direction is calculated internally and output d is switched at a rising or falling edge of output f. the ak877 8b is for use in the incremental pulse encoder s or rotatio nal detection system s . ? 4.0 to 24 v supply voltage operation ? sensitivity (vertical , horizontal) : 1.7 mt (typ.) ? two o utput s : f ( pulse ), d ( direction ) ? small package: sop - 6 pin ? halogen free ak877 8b 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 8b ] ms 1466 - e - 00 september 2012 2 figure 1. block d iagram table 1 . circuit configuration block function regulator generate internal operating 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 hal l sensor output voltage with summation and subtraction circuit . comp hysteresis comparator. bias generates bias current to internal circuits. he _drive generates bias current for hall sensors . osc generates operating clock. t iming logic generates timin g signal for internal circuits . latch & logic logical circuits and o pen drain driver . block d iagram circuit c onfiguration chopper_sw latch & logic regulator bias he_drive osc timing logic chop_amp comp vreg vdd vss f d hall sensors 0.1 m f
[ak877 8b ] ms 1466 - 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 f o output f (pulse) pin ope n d rain 4 d o output d (direction) pin 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 ? out ? sink 20 ma f , d 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/function
[ak877 8b ] ms 1466 - 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. ma x. unit note current consumption i dd 1.4 3.0 5.6 m a o utput saturation v oltage v sat 0.4 v f , d 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 8b ] ms 1466 - e - 00 september 2012 5 the internal signal a switches ? low ? state when the magnetic field perpendicular to the marking s ide of the package exceeds bopv. wh en the magnetic field is reduce d below brpv, the internal signal a goes ? high ? state . otherwise ; that is, in case of the magnetic field strength is greater than brpv and smaller than bopv ; the internal signal a ke eps its status . the internal signal b switches ? low ? state when the magnetic field p arallel to the marking side of the package exceeds bop h. wh en the magnetic field is reduce d below brph, the internal signal b goes ? high ? state . otherwise ; that is, in case of the magnetic field strength is greater than brph and smaller than boph; the internal signal b keeps its status. bhv internal signa l a bopv brp v s n 0 figure 2. switching behavior of the internal signal a when verti cal magnetic field is applied bh h internal signal b bop h brp h s n 0 figure 3. switching behavior of the internal s ignal 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 d pin vss pin
[ak877 8b ] ms 1466 - e - 00 september 2012 6 t be haviors of internal signal a, b and output signal f, d when a rotating magnetic field is applied on ak877 8b f signal ( pulse) is correspond to the result of ex - or operation of internal signal a and b. and signal d ( direction ) is calculated by the state of i nternal signal a and b. *m.f.d. is magnetic flux density. note) s ignal d is determined after one signal f pulse is sent out . the indeterminate output stat e appears only in the poweri ng up of this device. vertical m.f.d . horizontal m.f.d. d (direction) f (pulse) bopv brpv boph brph supply voltage v dd direction changed direction changed i nternal signal b ( horizont al) figure 4. behaviors of inter nal signal a,b and signal f, d when a rotating magnetic field is applied on ak877 8b t t t t t t t undefined (h igh or l ow ) signal f, d is det ermined. 0 0 0 0 0 i nternal signal a (vertical)
[ak877 8b ] ms 1466 - e - 00 september 2012 7 *m.f.d. is magnetic flux density . figure 5 . timing diagram functional timing vertical m.f.d. horizontal m.f.d. bopv brpv 0 sampling cycle internal signal a (vertical) boph brph 0 t p : 16.7 s(typ.) t t t t t internal signal b (horizontal) t f (pulse) 0
[ak877 8b ] ms 1466 - e - 00 september 2012 8 *m.f.d. is magnetic flux density . note ) v dd = 12 .0v ,r l =10k ? , c l =20pf figure 6 . t imin g diagram (in detail) sampling cycle direction changed direction changed 6s(typ.) f (pulse) vertical m.f.d. horizontal m.f.d. bopv,boph 0 brpv,brph m.f.d. d (direction) t t 50%v dd t t 50%v dd 6s(typ.) 6s(typ.) 6s(typ.) 6s(typ.) 6s(typ.) 0 0
[ak877 8b ] ms 1466 - e - 00 september 2012 9 figure 7 . temperature dependenc e of sensitivity figure 8 . temperature dependence of current consumption typical characteristic data (for reference)
[ak877 8b ] ms 1466 - e - 00 september 2012 10 note 1 ) the center of the sensitive area is located within the ? 0.3mm circle. note 2 ) coplanarity: the differences between sta ndoff of terminals are max. 0.1mm. note 3) the sensor part is located 0. 7 1mm (typ.) from marking surface. material of terminals cu alloy material of plating for terminals sn 100 thickness of plating for terminals 10m ( t yp.) package figure 9 . package dimensions 1 2 3 6 5 4 1:vdd 2:tab 3: f 4: d 5:tab 6:vss unit in mm
[ak877 8b ] ms 1466 - e - 00 september 2012 11 figure 10 . marking marking is perf ormed by laser product name 6 (ak877 8 b ) date code y wwl y m anufactured year ww manufactured week l lot marking figure 11 . recommended external circuit recommended e xternal c ircuit line marking 6 5 4 1 2 3 6ywwl gnd v dd 6 5 4 1 2 3 top view 0.1 f v dd v dd 10k 10k output (f) output (d)
[ak877 8b ] ms 1466 - e - 00 september 2012 12 important notice ? these products and their specif ications 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 distributors 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 application examples of the semiconductor 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 parties arising from the use of these inform ation 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 a n 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 director of akm. as used here: note1) a criti cal 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 which must therefore meet very high standa rds 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, disposes of, or otherwise places the product w ith 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 s aid product in the absence of such notification.

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