AKM AK8777B Spec sheet

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AKM AK8777B Spec sheet | Manualzz

[AK8777B]

AK8777B

H a l l l l

E f f f f e e c t t

I

I

C f f o r r

P u l l s s e e E n c c o d e r r s s

Overview

The AK8777B 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 output OUTA and OUTB are switched according to the vertical and horizontal magnetic fields applied to the device. The AK8777B is for use in the incremental pulse encoders or rotational detection systems.

Features

o 4.0 to 24V supply voltage operation o

Sensitivity (Vertical, Horizontal) : ±1.7mT(Typ.) o Two outputs : OUTA (detects vertical magnetic field), OUTB (detects horizontal magnetic field) o Small package: SOP-6pin o Halogen free

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[AK8777B]

VDD

VSS

REGULATOR

VREG

Block Diagram

BIAS

HE_DRIVE

CHOP_AMP COMP

OSC

TIMING

LOGIC

OUTA

OUTB

HALL SENSORS

Figure 1. Block diagram

Circuit Configuration

Block

REGULATOR

HALL SENSORS

CHOPPER_SW

CHOP_AMP

COMP

BIAS

HE_DRIVE

OSC

TIMING LOGIC

LATCH & LOGIC

Table 1. Circuit configuration

Function

Generate internal operating voltage.

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 internal circuits.

Generates bias current for Hall sensors.

Generates operating clock.

Generates timing signal for internal circuits.

Logical circuits and open drain driver.

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Pin/Function

Table 2. Description of pin name and function

Pin No. Pin name I/O

1 VDD

2

3

4

5

6

TAB

OUTA

OUTB

TAB

VSS

O

O

Note) TAB pins should be connected to VSS.

Function

Power supply pin

(TAB pin)

Output A pin. Relating to the vertical magnetic field.

Output B pin. Relating to the horizontal magnetic field.

(TAB pin)

Ground pin

Absolute Maximum Ratings

Note

Open drain

Open drain

Parameter

Supply voltage

Output voltage

Symbol

V

V

T able 3. Absolute maximum ratings

DD

OUT

Min.

0.3

0.3

Max.

+32

+32

Unit

V

V

Output current

Storage temperature

I

T

OUT

STG

55

20

+150 mA

°

C

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

Recommended Operating Conditions

Parameter

Supply voltage

Output current

Operating temperature

Table 4. Recommended operating conditions

Symbol

I

V

DD

SINK

Ta

Min.

4.0

40

Typ.

12.0

Max.

24.0

15

+125

Note

VSS=0V

OUTA,OUTB pin

VSS=0V

OUTA,OUTB pin

Unit

V mA

°

C

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Electrical Characteristics

Table 5. Electrical characteristics at V

DD

=4.0 to 24.0V, Ta=

40 to +125

°

C

Parameter

Current consumption

Output saturation voltage

Output leak current

Output refresh period

Symbol Min.

I

DD

1.4

I

V

SAT

LEAK

T

P

12.0

Typ.

3.0

16.7

Max. Unit

5.6 mA

0.4

10

30.5

Note

V

OUTA,OUTB pin,

I

SINK

= 15mA

µ

A OUTA, OUTB =V

µ s

DD

Magnetic Characteristics

Hysteresis

Table 6. Magnetic characteristics at V

DD

=4.0 to 24.0V, Ta=

40 to +125

°

C

Parameter

Operating point of

vertical magnetic field

Releasing point of

vertical magnetic field

Operating point of horizontal magnetic field

Operating point of horizontal magnetic field

Symbol

BopV

BrpV

BopH

BrpH

BhV, BhH

(*1) Horizontal magnetic flux density is zero.

(*2) Vertical magnetic flux density is zero.

Min.

0.1

4.0

0.1

4.0

1.5

Typ.

1.7

1.7

1.7

1.7

3.4

Max.

4.0

0.1

4.0

0.1

6.8

Unit

mT mT mT mT mT

Note

(*1)

(*1)

(*2)

(*2)

(*1), (*2)

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Operational Characteristics

The signal OUTA switches ‘Low’ state (ON) when the magnetic field perpendicular to the marking side of the package exceeds BopV. When the magnetic field is reduces below BrpV, the OUTA goes ‘High’ state (OFF).

Otherwise; that is, in case of the magnetic field strength is greater than BrpV and smaller than BopV; OUTA keeps its status.

Top(Marking)

S

N

Bottom

BrpV

N

Signal OUTA

BhV

0

BopV

S

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

The signal OUTB switches ‘Low’ state (ON) when the magnetic field parallel to the marking side of the package exceeds BopH. When the magnetic field is reduces below BrpH, the OUTB goes ‘High’ state (OFF). Otherwise; that is, in case of the magnetic field strength is greater than BrpH and smaller than BopH; OUTB keeps its status.

Line Marking

Signal OUTB

Top(Marking)

N

Bottom

VSS pin

S

OUTB pin

BrpH

N

BhH

0

BopH

S

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

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Sampling cycle

Vertical M.F.D.

BopV

BrpV

0

Sampling

Cycle

M.F.D.

BopV, BopH

0

BrpV, BrpH

Horizontal M.F.D.

BopH

0

BrpH signal OUTA

0 signal OUTB

0

Functional Timing

t t

T

P

: 16.7μs(Typ.)

6μs(Typ.)

Sampling

Cycle

M.F.D.

BopV, BopH

0

BrpV, BrpH t t t t t t t

6μs(Typ.) signal OUTA, signal OUTB

0

*M.F.D. is Magnetic Flux Density

.

Note) V

DD

=12.0V, R

L

=10k

, C

L

=20pF

50%V

DD t signal OUTA, signal OUTB

0

Figure 4. Timing diagram

50%V

DD t

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Typical Characteristic Data (for reference)

Figure 5. Temperature dependence of sensitivity

Figure 6. Temperature dependence of current consumption

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Package

6 5 4

1 2 3

Figure 7. Package dimensions

Note 1) The center of the sensitive area is located within the

φ

0.3mm circle.

1:VDD

2:TAB

3:OUTA

4:OUTB

5:TAB

6:VSS

Note 2) Coplanarity: The differences between standoff of terminals are max. 0.1mm.

Note 3) The sensor part is located 0.71mm(Typ.) from marking surface.

Unit in mm

Material of terminals: Cu alloy

Material of plating for terminals: Sn 100%

Thickness of plating for terminals:10μm (Typ.)

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Marking

Line Marking

6 5 4

5YWWL

1 2 3

Figure 8. Marking

GND

Marking is performed by laser

Product name : 5 (AK8777B)

Date code : YWWL

Y : Manufactured year

WW : Manufactured week

L : Lot

Recommended External Circuit

6 5 4

V

DD

V

DD

Output (OUTB)

V

DD

Top View

1 2 3

Output (OUTA)

Figure 9. Recommended external circuit

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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, 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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