AK8778 Datasheet, PDF (5/12 Pages) Asahi Kasei Microsystems – HALL EFFECT IC FOR PULSE ENCODERS

[AK8778]
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.
S
Top(Marking)
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
0
D pin
N
S
Figure 3. Switching behavior of the internal signal B when horizontal magnetic field is applied
MS1467-E-00
September 2012
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