AK8775 - AKM Semiconductor

[AK8775]

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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.

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

AK8775

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Features

Overview

[AK8775]

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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

OUTA

OUTB

VDD

VSS

LATCH&LOGIC

CHOPPER_SW

[AK8775]

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Table 2. Description of pin name and function

Pin No.

Pin name

I/O Function Note

1 VDD − Power supply pin

2 OUTA O Output A pin. Relating to the vertical magnetic field CMOS output

3 OUTB O Output B pin. Relating to the horizontal magnetic field

CMOS output

4 VSS − Ground pin

Table 3. Absolute maximum ratings

Parameter Symbol Min. Max. Unit Note

Power supply voltage VDD −0.3 +6.5 V

Output current IOUT −0.5 +0.5 mA OUTA,OUTB pin

Storage temperature TSTG −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 VDD 1.6 3.0 5.5 V

Operating temperature Ta −30 +85 °C

Table 5. Electrical characteristics (Ta=25°C, VDD = 3.0V)

Parameter Symbol Min. Typ. Max. Unit Note

Current consumption IDD 90 210 µA Average

High level output Voltage VOH VDD-0.4

V OUTA,OUTB pin,

IOUT= −0.5mA

Low level output Voltage VOL 0.4 V OUTA,OUTB pin,

IOUT= +0.5mA

Pulse drive period TPD1 0.5 1.0 2.0 ms

Pulse drive duration time TPD2 12.2 24.4 48.8 µs

Note) Internal data is determined just before the internal circuit turns off. And after 6.1μs (Typ.), the output

changes.

Electrical Characteristics

Absolute Maximum Ratings

Recommended Operating Conditions

Pin/Function

[AK8775]

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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. 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

[AK8775]

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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.

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.

S

N

Top(Marking)

Bottom

BhV

Output

BopV

BrpV

S [ｍT] N [ｍT] 0

Figure 2. Switching behavior of output signal OUTA

when vertical magnetic field is applied

BhH

Output

BopH

BrpH

S [ｍT] N [ｍT] 0

Figure 3. Switching behavior of output signal OUTB

when horizontal magnetic field is applied

Operational Characteristics

S

N

Top(Marking)

Line Marking

Bottom

OUTB pin

VSS pin

[AK8775]

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*M.F.D. is Magnetic Flux Density.

Note)VDD=3.0V.

Current consumption

Vertical M.F.D.＊

Horizontal M.F.D.

OUTA

(Vertical)

BopV

BrpV

BopH

BrpH

TPD2 (Typ. 24.4μs) TPD1 (Typ. 1.0ms)

6.1μs(Typ.)

t

IDD ON (Typ. 3.5mA)

OUTB

(Horizontal)

6.1μs(Typ.)

6.1μs(Typ.) 6.1μs(Typ.)

Figure 4. The timing chart of current consumption

and transition timing of output signal

Functional Timing

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Typical Characteristic Data (for reference)

Figure 5. Temperature dependence of sensitivity

-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 (VDD=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 (VDD=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 (VDD=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 (VDD=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 (VDD=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 (VDD=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 [℃]

IDD vs. Ta (in various VDD)

I

DD

[µA]

0

20

40

60

80

100

120

140

160

1 2 3 4 5 6

VDD [V]

IDD vs. VDD (in various Ta)

I

DD

[µA]

5.5V

3.0V

1.6V

-30℃

0℃

25℃

85℃

Figure 6. Temperature dependence of current consumption

[AK8775]

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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.)

Package

Unit in mm

Figure 7. Package dimensions

1. VDD

2. F

3. D

4. VSS 【単位】mm

センサ中心(*8)～(*11)

Marking

３

４

２

１

1:VDD

2:OUTA

3:OUTB

4:VSS

Sensor Center

[AK8775]

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Marking is performed by laser

Product name ：H (AK8775)

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 8. Marking

3

4

2

1

HYML

4

1

Output (

OUTB

signal)

Output (OUTA signal)

0.1μF

VDD

GND

Top View

Figure 9. Recommended external circuit

3

2

Line Marking

Recommended External Circuit

[AK8775]

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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,

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assumes no responsibility for any losses incurred by you or third parties arising from the use of these

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other rights in the application or use of such information contained herein.

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life support, or other hazard related device or systemNote2), and AKM assumes no responsibility for

such use, except for the use approved with the express written consent by Representative Director of

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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

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which its failure to function or perform may reasonably be expected to result in loss of life or in

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