BU52040HFV_10 Datasheet, PDF (6/13 Pages) Rohm – Bipolar Latch Hall IC

BU52040HFV
(Magnetic Field Detection Mechanism)
High
OUT [V]
Technical Note
N-pole
Brp
0 _Bop
Magnetic flux density [mT]
Low
B
S-pole
Fig.15
The IC detects magnetic fields that running horizontal to the top layer of the package. When the magnetic pole switches
from N to S, the output changes from high to low; likewise, when the magnetic pole switches from S to N, the output
changes from low to high. The output condition is held unit the next switch in magnetic polarity is detected.
[Operation in Continuously Changing Magnetic Fields]
Direction of magnet movement
Magnet
S
N
S
N
S
N
S
N
S
N
S
N
Hall IC
S
Bop
Magnetic field
N
Brp
High
Hall IC output
Low
Fig.16
The IC can detect a continuous switch in magnetic field (from N to S and S to N) as depicted above.
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6/12
2010.01 - Rev.B