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[AK8776] ms1317-e-00 2011/july 1 AK8776 is a hall effect latch which detects both ?vertical? and ?horizontal? (perpendicular and parallel to the marking side of the package) magnetic field at the same time and outputs the pulse (f) and rotational direction (d). AK8776 is for use in portable devices which uses rotational detection system or incremental pulse encoder such as jog dial utilized for input devices. o 1.6 to 5.5v operation o bop, brp(vertical, horizontal) 1.5mt(typ.), highly sensitive o low power operation : average 90 a(typ.) @v dd =3v o two output: f-output (pulse count), d-output (direction of rotation) o small package: sop-4pin, halogen free AK8776 h h a a l l l l 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 features overview
[AK8776] ms1317-e-00 2011/july 2 figure 1. block diagram table 1. circuit configuration block function hall sensors two hall elements fabricated by cmos process. chopper_sw perform chopping in order to cancel the offset of hall sensor. chop_amp amplifies two hall sensor output voltage with summation and subtraction circuit. comp hysteresis comparator. bias generates bias current to other circuits. he_drive generates bias current for hall sensors. osc generates operating clock. timing logic generates timing signal required for chopper sw, amp and comp. latch & logic logical circuits and cmos output buffer. block diagram circuit configuration timing logic he_drive bias osc comp chop_amp hall sensors f d vdd vss latch&logic chopper_sw
[AK8776] ms1317-e-00 2011/july 3 table 2. description of pin name and function pin no. pin name i/o function note 1 vdd - power supply pin 2 f o output f (pulse) pin cmos output 3 d o output d (direction) pin cmos output 4 vss - ground pin table 3. absolute maximum ratings parameter symbol min. max. unit note power supply voltage v dd - 0.3 +6.5 v output current i out - 0.5 +0.5 ma f,d pin storage temperature t stg - 40 +125 c note) stress beyond these listed values may cause permanent damage to the device. table 4. recommended operating conditions parameter symbol min. typ. max. unit power supply voltage v dd 1.6 3.0 5.5 v operating temperature ta - 30 +85 c table 5. electrical characteristics (ta=25 c, v dd = 3.0v) parameter symbol min. typ. max. unit note current consumption i dd 90 210 m a average high level output voltage v oh v dd -0.4 v f,d pin, i out = - 0.5ma low level output voltage v ol 0.4 v f,d pin, i out = +0.5ma pulse drive period t pd1 0.5 1.0 2.0 ms pulse drive duration time t pd2 12.2 24.4 48.8 m s note) internal data is determined just before the internal circuit turns off. and after 6.1 s (typ.), the output changes. electrical characteristics absolute maximum ratings recommended operating conditions pin/function
[AK8776] ms1317-e-00 2011/july 4 the output f and d is processed signals from internal signal a and b which is determined by the applied magnetic field and threshold level bopv, brpv, boph and brph as follows. table 6. magnetic characteristics(ta = 25 c, v dd = 3.0v) parameter symbol min. typ. max. unit note vertical magnetic field operating point bopv 1.5 4.0 mt (*1) vertical magnetic field releasing point brpv - 4.0 - 1.5 mt (*1) horizontal magnetic field operating point boph 1.5 4.0 mt (*2) horizontal magnetic field releasing point brph - 4.0 - 1.5 mt (*2) hysteresis bhv, bhh 3.0 mt (*1), (*2) (*1) horizontal magnetic flux density is zero. (*2) vertical magnetic flux density is zero. magnetic characteristics
[AK8776] ms1317-e-00 2011/july 5 AK8776 detects the ?vertical? (perpendicular to the marking side of the package) magnetic field, and the resulting internal signal a changes state. when the magnetic field is more positive than bopv, the internal signal a changes to ?low? state. and it is kept while the magnetic field remains more positive than brpv. when the magnetic field drops below brpv, the internal signal a changes to ?high? state. those threshold magnetic flux density levels are defined in table 6. AK8776 detects ?horizontal ?(parallel to the marking side of the package) magnetic field, and the resulting internal signal b changes state. when the magnetic field is more positive than boph, the internal signal b changes to ?low? state. and it is kept while the magnetic field remains more positive than brph. when the magnetic field drops below brph, the internal signal b changes to ?high? state. those threshold magnetic flux density levels are defined in table 6. figure 2. switching behavior of internal signal a when vertical magnetic field is applied figure 3. switching behavior of internal signal b when horizontal magnetic field is applied operational characteristics s n top(marking) bottom bhv internal signal a bopv brpv s [ t] n [ t] 0 bhh internal signal b boph brph s [ t] n [ t] 0 s n top(marking) line marking bottom d pin vss pin
[AK8776] ms1317-e-00 2011/july 6 behaviors of internal signal a,b and output signal f, d when a rotating magnetic field is applied on AK8776 f signal (pulse) is correspond to the result of internal signal a and b. and d signal (direction) is given by looking up the state of signal a and b. *m.f.d. is magnetic flux density. note) d signal is determined after one pulse sent out of f signal. the section which the output status is undefined appears only in the starting up of this device. vertical m.f.d . horizontal m.f.d. i nternal signal a (vertical) d (direction) f (pulse) bopv brpv boph brph supply voltage v dd direction changed direction changed internal signal b (horizontal) figure 4. behaviors of internal signal a,b and output signal f, d when a rotating magnetic field is applied on AK8776 t t t t t t t undefined (h igh or l ow ) f,d signal is determined.
[AK8776] ms1317-e-00 2011/july 7 note)v dd =3.0v. output signal f and d are changed at the same time. current consumption vertical m.f.d. horizontal m.f.d. internal signal a (vertical) bopv brpv boph brph t t t t t i dd on (typ. 3.5ma) 6.1 s(typ.) t internal signal b (horizontal) f (pulse) t pd2 (typ. 24.4 s) t pd1 (typ. 1.0ms) 6.1 s(typ.) 6.1 s(typ.) 6.1 s(typ.) figure 5. the timing chart of current consumption and transition timing of internal and output signal functional timing
[AK8776] ms1317-e-00 2011/july 8 typical characteristic data (for reference) figure 6. temperature dependence of sensitivity figure 7. temperature dependence of current consumption -4 -3 -2 -1 0 1 2 3 4 -30-20-10 0 10 20 30 40 50 60 70 80 90 ambient temperature ta [ ] bopv, brpv vs. ta (v dd =1.6v) bopv, brpv [mt] bopv brpv -4 -3 -2 -1 0 1 2 3 4 -30-20-10 0 10 20 30 40 50 60 70 80 90 ambient temperature ta [ ] bopv, brpv vs. ta (v dd =3.0v) bopv, brpv [mt] bopv brpv -4 -3 -2 -1 0 1 2 3 4 -30-20-10 0 10 20 30 40 50 60 70 80 90 ambient temperature ta [ ] bopv, brpv vs. ta (v dd =5.5v) bopv, brpv [mt] bopv brpv -4 -3 -2 -1 0 1 2 3 4 -30-20-10 0 10 20 30 40 50 60 70 80 90 ambient temperature ta [ ] boph, brph vs. ta (v dd =1.6v) boph, brph [mt] boph brph -4 -3 -2 -1 0 1 2 3 4 -30-20-10 0 10 20 30 40 50 60 70 80 90 ambient temperature ta [ ] boph, brph vs. ta (v dd =3.0v) boph, brph [mt] boph brph -4 -3 -2 -1 0 1 2 3 4 -30-20-10 0 10 20 30 40 50 60 70 80 90 ambient temperature ta [ ] boph, brph vs. ta (v dd =5.5v) boph, brph [mt] boph brph 0 20 40 60 80 100 120 140 160 -30-20-10 0 10 20 30 40 50 60 70 80 90 ambient temperature ta [ ] i dd vs. ta (in various v dd ) i dd [ a] 0 20 40 60 80 100 120 140 160 1 2 3 4 5 6 v dd [v] i dd vs. v dd (in various ta) i dd [ a] 5.5v 3.0v 1.6v -30 0 25 85
[AK8776] ms1317-e-00 2011/july 9 note 1) the center of the sensor is located within the f 0.3mm circle. note 2) the tolerances of dimensions with no mentions are 0.1mm. note 3) coplanarity: the differences between standoff of terminals are max. 0.1mm. note 4) the sensor part is located 0.4mm0.1mm far from marking surface. material of terminals cu alloy material of plating for terminals sn 100 thickness of plating for terminals 10 m (typ.) package unit in mm figure 8. package dimensions 1. vdd 2. f 3. d 4. vss g mm (*8) (*11) marking # $ % 1:vdd 2:f 3:d 4:vss sensor center
[AK8776] ms1317-e-00 2011/july 10 marking is performed by laser product name j (AK8776) date code yml y last one digit of manufactured year 0 9 m manufactured month jan. c jul. j feb. d aug. k mar. e sept. l apr. f oct. m may. g nov. n jun. h dec. p l lot(1 9,a z) marking figure 10. recommended external circuit figure 9. marking 3 4 2 1 jyml line marking 4 1 output ( d signal) output (f signal) 0.1 f v dd gnd top view 3 2 recommended external circuit
[AK8776] ms1317-e-00 2011/july 11 important notice l 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 distributors as to current status of the products. l 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 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. l 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. l 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 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 which 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. l it is the responsibility of the buyer or distributor of akm products, who distributes, disposes 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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