AK8775 Datasheet, PDF (5/10 Pages) Asahi Kasei Microsystems – Hall IC for Pulse Encoder

[AK8775]
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
Top(Marking)
Bottom
N
Output
BhV
BrpV
0
N [ｍT]
BopV
S [ｍT]
Figure 2. Switching behavior of output signal OUTA
when vertical magnetic field is applied
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
Top(Marking)
N
VSS pin
S
Output
BhH
BrpH
BopH
Bottom
OUTB pin
0
N [ｍT]
S [ｍT]
Figure 3. Switching behavior of output signal OUTB
when horizontal magnetic field is applied
MS1316-E-00
5
2011/July