AK8776 Datasheet, PDF (5/11 Pages) Asahi Kasei Microsystems – Hall IC for Pulse Encoder

[AK8776]
Operational Characteristics
AK8776 detects the “vertical” (perpendicular to the marking side of the package) magnetic field, and the resulting
internal signal A changes state. When the magnetic field is more positive than BopV, the internal signal A 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 internal signal A changes to ‘High’ state. Those threshold magnetic flux density levels are defined
in Table 6.
S
Top(Marking)
Bottom
N
Internal signal A
BhV
BrpV
0
N [ｍT]
BopV
S [ｍT]
Figure 2. Switching behavior of internal signal A when vertical
magnetic field is applied
AK8776 detects “horizontal “(parallel to the marking side of the package) magnetic field, and the resulting internal
signal B changes state. When the magnetic field is more positive than BopH, the internal signal B 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 internal signal B changes to ‘High’ state. Those threshold magnetic flux density levels are defined in
Table 6.
Line Marking
Top(Marking)
N
VSS pin
S
Internal signal B
BhH
BrpH
BopH
Bottom
D pin
0
N [ｍT]
S [ｍT]
Figure 3. Switching behavior of internal signal B
when horizontal magnetic field is applied
MS1317-E-00
5
2011/July