[AK8775] AK8775 Hall IC for Pulse Encoder Overview AK8775 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. The result of Hall effect latch operation in vertical and horizontal magnetic field is read out to OUTA pin and OUTB pin. AK8775 is for use in portable devices which uses rotational detection system or incremental pulse encoder such as jog dial utilized for input devices. Features o 1.6 to 5.5V operation o Bop, Brp (Vertical, Horizontal) ±1.5mT(Typ.), Highly sensitive o Low power operation : Average 90μA(Typ.) @VDD=3V o Two outputs : OUTA (detects vertical magnetic field), OUTB (detects horizontal magnetic field) o Small package: SOP-4pin, Halogen free MS1316-E-00 1 2011/July [AK8775] Block Diagram VDD BIAS OSC HE_DRIVE TIMING LOGIC VSS CHOP_AMP COMP LATCH&LOGIC CHOPPER_SW HALL SENSORS OUTA OUTB Figure 1. Block diagram Circuit Configuration Table 1. Circuit configuration Block Function HALL SENSORS CHOPPER_SW Two Hall elements fabricated by CMOS process. Perform chopping in order to cancel the offset of Hall sensor. Amplifies two Hall sensor output voltage with summation and subtraction circuit. Hysteresis comparator. Generates bias current to other circuits. Generates bias current for Hall sensors. Generates operating clock. Generates timing signal required for Chopper SW, AMP and COMP. Logical circuits and CMOS output buffer. CHOP_AMP COMP BIAS HE_DRIVE OSC TIMING LOGIC LATCH & LOGIC MS1316-E-00 2 2011/July [AK8775] Pin/Function Pin No. 1 2 3 4 Pin name VDD OUTA OUTB VSS Table 2. Description of pin name and function I/O Function Power supply pin − O Output A pin. Relating to the vertical magnetic field O Output B pin. Relating to the horizontal magnetic field Ground pin − Note CMOS output CMOS output Absolute Maximum Ratings Table 3. Absolute maximum ratings Parameter Symbol Min. Max. Unit +6.5 Power supply voltage VDD V −0.3 +0.5 Output current IOUT mA −0.5 +125 Storage temperature TSTG −40 °C Note) Stress beyond these listed values may cause permanent damage to the device. Note OUTA,OUTB pin Recommended Operating Conditions Parameter Power supply voltage Operating temperature Table 4. Recommended operating conditions Symbol Min. Typ. VDD 1.6 3.0 Ta −30 Max. 5.5 +85 Unit V °C Electrical Characteristics Table 5. Electrical characteristics (Ta=25°C, VDD = 3.0V) Parameter Symbol Min. Typ. Max. Unit 90 Current consumption IDD 210 µA V High level output Voltage VOH VDD-0.4 Low level output Voltage VOL 0.4 V Note Average OUTA,OUTB pin, IOUT= −0.5mA OUTA,OUTB pin, IOUT= +0.5mA Pulse drive period TPD1 0.5 1.0 2.0 ms 24.4 Pulse drive duration time TPD2 12.2 48.8 µs Note) Internal data is determined just before the internal circuit turns off. And after 6.1μs (Typ.), the output changes. MS1316-E-00 3 2011/July [AK8775] Magnetic Characteristics The output OUTA and OUTB is determined by the applied magnetic field and threshold level BopV, BrpV, BopH and BrpH as follows. Table 6. Magnetic characteristics(Ta = 25°C, VDD = 3.0V) Parameter Symbol Min. Vertical magnetic field BopV operating point Vertical magnetic field BrpV −4.0 releasing point Horizontal magnetic field BopH operating point Horizontal magnetic field BrpH −4.0 releasing point Hysteresis BhV, BhH (*1) Horizontal magnetic flux density is zero. Typ. Max. Unit Note 1.5 4.0 mT (*1) mT (*1) mT (*2) −1.5 mT (*2) 3.0 mT (*1), (*2) −1.5 1.5 4.0 (*2) Vertical magnetic flux density is zero. MS1316-E-00 4 2011/July [AK8775] Operational Characteristics AK8775 detects the “vertical” (perpendicular to the marking side of the package) magnetic field, and the resulting output signal OUTA changes state. When the magnetic field is more positive than BopV, the signal OUTA 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 signal OUTA changes to ‘High’ state. Those threshold magnetic flux density levels are defined in Table 6. Output S Top(Marking) BhV BopV BrpV Bottom 0 N N [ｍT] S [ｍT] Figure 2. Switching behavior of output signal OUTA when vertical magnetic field is applied AK8775 detects “horizontal “(parallel to the marking side of the package) magnetic field, and the resulting output signal OUTB changes state. When the magnetic field is more positive than BopH, the signal OUTB 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 signal OUTB changes to ‘High’ state. Those threshold magnetic flux density levels are defined in Table 6. Output Line Marking Top(Marking) VSS pin BhH N BopH BrpH S 0 N [ｍT] OUTB pin S [ｍT] Bottom Figure 3. Switching behavior of output signal OUTB when horizontal magnetic field is applied MS1316-E-00 5 2011/July [AK8775] Functional Timing Current consumption TPD2 (Typ. 24.4μs) TPD1 (Typ. 1.0ms) IDD ON (Typ. 3.5mA) t Vertical M.F.D.＊ BopV t BrpV Horizontal M.F.D. BopH t BrpH 6.1μs(Typ.) 6.1μs(Typ.) OUTA (Vertical) t 6.1μs(Typ.) 6.1μs(Typ.) OUTB (Horizontal) t Figure 4. The timing chart of current consumption and transition timing of output signal *M.F.D. is Magnetic Flux Density. Note)VDD=3.0V. MS1316-E-00 6 2011/July [AK8775] Typical Characteristic Data (for reference) 4 3 BopV 2 BrpV BopH, BrpH [mT] BopV, BrpV [mT] 4 1 0 -1 -2 -3 3 BopH 2 BrpH 1 0 -1 -2 -3 -4 -4 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 -30 -20 -10 0 Ambient temperature Ta [℃] BopV, BrpV vs. Ta (VDD=1.6V) 4 30 40 50 60 70 80 90 2 BopH BrpH 3 BopH, BrpH [mT] BopV, BrpV [mT] 20 4 BopV BrpV 3 1 0 -1 -2 -3 2 1 0 -1 -2 -3 -4 -4 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 -30 -20 -10 0 Ambient temperature Ta [℃] BopV, BrpV vs. Ta (VDD=3.0V) 10 20 30 40 50 60 70 80 90 Ambient temperature Ta [℃] BopH, BrpH vs. Ta (VDD=3.0V) 4 3 BopV 2 BrpV BopH, BrpH [mT] 4 BopV, BrpV [mT] 10 Ambient temperature Ta [℃] BopH, BrpH vs. Ta (VDD=1.6V) 1 0 -1 -2 -3 3 BopH 2 BrpH 1 0 -1 -2 -3 -4 -4 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 -30 -20 -10 0 Ambient temperature Ta [℃] BopV, BrpV vs. Ta (VDD=5.5V) 10 20 30 40 50 60 70 80 90 Ambient temperature Ta [℃] BopH, BrpH vs. Ta (VDD=5.5V) Figure 5. Temperature dependence of sensitivity 160 160 140 140 5.5V 100 80 IDD [µA] IDD [µA] 120 3.0V 60 1.6V 120 -30℃ 0℃ 25℃ 100 85℃ 80 60 40 40 20 20 0 0 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 1 2 3 4 5 6 VDD [V] IDD vs. VDD (in various Ta) Ambient temperature Ta [℃] IDD vs. Ta (in various VDD) Figure 6. Temperature dependence of current consumption MS1316-E-00 7 2011/July [AK8775] Package Unit in mm ４ ３ １ ２ センサ中心(*8)～(*11) Sensor Center Marking 1:VDD 1. VDD 2:OUTA 2. F 3:OUTB 3. D 4:VSS 4. VSS 【単位 】mm Figure 7. Package dimensions Note 1) The center of the sensor is located within the φ0.3mm circle. Note 2) The tolerances of dimensions otherwise noted are ±0.1mm. Note 3) Coplanarity: The differences between standoff of terminals are max. 0.1mm. Note 4) The sensor part is located 0.4mm±0.1mm far from marking surface. Material of terminals： Cu alloy Material of plating for terminals： Sn 100％ Thickness of plating for terminals：10μm (Typ.) MS1316-E-00 8 2011/July [AK8775] Marking 4 3 Marking is performed by laser Product name ：H (AK8775) ：YML Date code HYML 1 Y：Last one digit of manufactured year（0∼ 9） M：Manufactured month Jan. C 2 Line Marking Figure 8. Marking 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) Recommended External Circuit GND Output (OUTB signal) 4 0.1μF 3 Top View 1 2 Output (OUTA signal) VDD Figure 9. Recommended external circuit MS1316-E-00 9 2011/July [AK8775] IMPORTANT NOTICE l These products and their specifications are subject to change without notice. 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