AK8775

[AK8775]

AK8775

Overview

H a l l l l I

I C f f o r r P u l l s e E n c o d e r r

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.) @V

DD

=3V o Two outputs : OUTA (detects vertical magnetic field), OUTB (detects horizontal magnetic field) o Small package: SOP-4pin, Halogen free

Distributed By:

955 Industrial Road, San Carlos, CA, 94070 USA

GMW Associates

PHONE: +1 650-802-8292 FAX: +1 650-802-8298 EMAIL: [email protected] WEB: www.gmw.com

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[AK8775]

Block Diagram

VDD

VSS

HALL SENSORS

BIAS

HE_DRIVE

OSC

TIMING LOGIC

CHOP_AMP COMP

OUTA

OUTB

Figure 1. Block diagram

Circuit Configuration

Table 1. Circuit configuration

Block Function

HALL SENSORS

CHOPPER_SW

CHOP_AMP

COMP

BIAS

HE_DRIVE

OSC

TIMING LOGIC

LATCH & LOGIC

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.

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Pin/Function

Table 2. Description of pin name and function

Pin No. Pin name I/O

1 VDD

−

2 OUTA O

3

4

OUTB

VSS

Function

Power supply pin

Note

Output A pin. Relating to the vertical magnetic field

CMOS output

O

Output B pin. Relating to the horizontal magnetic field

CMOS output

−

Ground pin

Absolute Maximum Ratings

T able 3. Absolute maximum ratings

Parameter

Power supply voltage

Output current

Storage temperature

Symbol

V

DD

I

OUT

T

STG

Min.

−

0.3

−

0.5

−

40

Max.

+6.5

+0.5

+125

Unit

V mA

°

C

Note) Stress beyond these listed values may cause permanent damage to the device.

Recommended Operating Conditions

Note

OUTA,OUTB pin

Parameter

Power supply voltage

Operating temperature

Table 4. Recommended operating conditions

Symbol

V

DD

Ta

Min.

1.6

−

30

Typ.

3.0

Max.

5.5

+85

Unit

V

°

C

Electrical Characteristics

Table 5. Electrical characteristics (Ta=25

°

C, V

DD

= 3.0V)

Parameter

Current consumption

Symbol

I

DD

Min. Typ.

90

Max. Unit

210

µ

A

V

Note

Average

High level output Voltage V

OH

V

DD

-0.4

OUTA,OUTB pin,

I

OUT

=

−

0.5mA

OUTA,OUTB pin,

Low level output Voltage V

OL

0.4

V

I

OUT

= +0.5mA

Pulse drive period

Pulse drive duration time

T

T

PD1

PD2

0.5

12.2

1.0

24.4

2.0

48.8 ms

µ s

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

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Magnetic Characteristics

The output OUTA and OUTB is determined by the applied magnetic field and threshold level BopV, BrpV, BopH and BrpH as follows.

Parameter

Vertical magnetic field operating point

Vertical magnetic field releasing point

Horizontal magnetic field operating point

Horizontal magnetic field releasing point

Hysteresis

Table 6. Magnetic characteristics(Ta = 25

°

C, V

DD

= 3.0V)

Symbol

BopV

BrpV

BopH

BrpH

BhV, BhH

(*1) Horizontal magnetic flux density is zero.

(*2) Vertical magnetic flux density is zero.

Min.

−

−

4.0

4.0

Typ.

−

−

1.5

1.5

1.5

1.5

3.0

Max.

4.0

4.0

Unit

mT mT mT mT mT

Note

(*1)

(*1)

(*2)

(*2)

(*1), (*2)

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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.

S

Output

Top(Marking)

N

Bottom

BrpV

N [ｍT]

BhV

0

Figure 2. Switching behavior of output signal OUTA when vertical magnetic field is applied

BopV

S [ｍT]

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.

Line Marking

Output

Top(Marking)

N

Bottom

VSS pin

S

OUTB pin

BrpH

N [ｍT]

BhH

Figure 3. Switching behavior of output signal OUTB when horizontal magnetic field is applied

0

BopH

S [ｍT]

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Current consumption

I

DD ON

(Typ. 3.5mA)

Vertical M.F.D.

＊

BopV

BrpV

Horizontal M.F.D.

BopH

BrpH

OUTA

(Vertical)

OUTB

(Horizontal)

Functional Timing

T

PD2

(Typ. 24.4μs)

6.1μs(Typ.)

6.1μs(Typ.)

T

PD1

(Typ. 1.0ms)

6.1μs(Typ.)

Figure 4. The timing chart of current consumption and transition timing of output signal

*M.F.D. is Magnetic Flux Density

.

Note)V

DD

=3.0V. t t t t

6.1μs(Typ.) t

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[AK8775]

Typical Characteristic Data (for reference)

0

-1

-2

-3

2

1

4

3

BopV

BrpV

-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)

0

-1

-2

-3

4

3

2

1

BopV

BrpV

-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)

0

-1

-2

-3

2

1

4

3

BopH

BrpH

-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)

0

-1

-2

-3

4

3

2

1

BopH

BrpH

-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)

1

0

-1

-2

-3

4

3

2

BopV

BrpV

-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)

1

0

-1

-2

-3

4

3

2

BopH

BrpH

-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)

Figure 5. Temperature dependence of sensitivity

160

140

120

100

80

60

40

20

5.5V

3.0V

1.6V

0

-30 -20 -10 0 10 20 30 40 50 60 70 80 90

Ambient temperature Ta [℃]

I

DD

vs. Ta (in various V

DD

)

160

140

120

100

80

60

40

20

0

1 2 3 4

V

DD

[V]

I

DD

vs. V

DD

(in various Ta)

5

Figure 6. Temperature dependence of current consumption

-30℃

0℃

25℃

85℃

6

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[AK8775]

Package

４ ３

センサ中心

(*8)～(*11)

１ ２

Marking

Figure 7. Package dimensions

Note 1) The center of the sensor is located within the

φ

0.3mm 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.)

Unit in mm

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[AK8775]

Marking

4

HYML

3

1 2

Line Marking

Figure 8. Marking

GND

0.1μF

V

DD

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

Feb. D

Jul.

Aug.

J

K

Mar.

Apr.

E

F

May.

Jun.

L：Lot(1∼ 9,A∼ Z)

G

H

Sept.

Oct.

Nov.

Dec.

L

M

N

P

Recommended External Circuit

4

1

Top View

3

2

Figure 9. Recommended external circuit

Output (OUTB signal)

Output (OUTA signal)

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[AK8775]

Distributed By:

955 Industrial Road, San Carlos, CA, 94070 USA

GMW Associates

PHONE: +1 650-802-8292 FAX: +1 650-802-8298 EMAIL: [email protected] WEB: www.gmw.com

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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