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PDF AK8778B Data sheet ( Hoja de datos )
| Número de pieza | AK8778B | |
| Descripción | Hall Effect IC | |
| Fabricantes | AKM | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK8778B (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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[AK8778B]
AK8778B
Hall Effect IC for Pulse Encoders
Overview
The AK8778B is a Hall effect latch which detects both “vertical magnetic field” and “horizontal magnetic field”
(perpendicular and parallel to the marking side of the package) at the same time. The pulse output F and direction
output D are switched according to the vertical and horizontal magnetic fields applied to the device. The direction
is calculated internally and output D is switched at a rising or falling edge of output F. The AK8778B is for use in
the incremental pulse encoders or rotational detection systems.
Features
4.0 to 24V supply voltage operation
Sensitivity (Vertical, Horizontal) : ±1.7mT(Typ.)
Two outputs : F (Pulse), D (Direction)
Small package: SOP-6pin
Halogen free
MS1466-E-00
September 2012
1
Free Datasheet http://www.datasheet4u.com/
1 page  
[AK8778B]
Operational Characteristics
The internal signal A switches „Low‟ state when the magnetic field perpendicular to the marking side of the package
exceeds BopV. When the magnetic field is reduced below BrpV, the internal signal A goes „High‟ state. Otherwise;
that is, in case of the magnetic field strength is greater than BrpV and smaller than BopV; the internal signal A keeps
its status.
Top(Marking)
S
Bottom
N
Internal signal A
BhV
BrpV
0
N
BopV
S
Figure 2. Switching behavior of the internal signal A when vertical magnetic field is applied
The internal signal B switches „Low‟ state when the magnetic field parallel to the marking side of the package
exceeds BopH. When the magnetic field is reduced below BrpH, the internal signal B goes „High‟ state. Otherwise;
that is, in case of the magnetic field strength is greater than BrpH and smaller than BopH; the internal signal B keeps
its status.
Line Marking
Top(Marking)
N
VSS pin
S
Internal signal B
BhH
BrpH
BopH
Bottom
D pin
0
N
S
Figure 3. Switching behavior of the internal signal B when horizontal magnetic field is applied
MS1466-E-00
September 2012
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
Line Marking
6
5
4
6YWWL
123
Figure 10. Marking
Marking
Marking is performed by laser
Product name ：6 (AK8778B)
Date code ：YWWL
Y：Manufactured year
WW：Manufactured week
L：Lot
Recommended External Circuit
VDD
[AK8778B]
GND
VDD
654
Top View
Output (F)
VDD
123
Output (D)
Figure 11. Recommended external circuit
MS1466-E-00
September 2012
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AK8778B.PDF ] | |
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