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BU52002GUL,BU52003GUL,BU52012NVX,BU52012HFV,BU52013HFV
Technical Note
 
14/19
www.rohm.com
2010.08 - Rev.C
?2010 ROHM Co., Ltd. All rights reserved.
 
BU52002GUL,BU52012HFV
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig.42    S-Pole Detection
 
BU52002GUL, BU52012HFV detects and outputs for the S-pole only. Since it is unipolar, it does not recognize the N-pole.
 
BU52003GUL, BU52013HFV
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig.43    N-Pole Detection
 
BU52003GUL, BU52013HFV detects and outputs for the N-pole only. Since it is unipolar, it does not recognize the S-pole.
 
The unipolar detection Hall IC detects magnetic fields running perpendicular to the top surface of the package. There is an
inverse relationship between magnetic flux density and the distance separating the magnet and the Hall IC: when distance
increases magnetic density falls. When it drops below the operate point (Bop), output goes HIGH. When the magnet gets
closer to the IC and magnetic density rises, to the operate point, the output switches LOW. In LOW output mode, the
distance from the magnet to the IC increases again until the magnetic density falls to a point just below Bop, and output
returns HIGH. (This point, where magnetic flux density restores HIGH output, is known as the release point, Brp.) This
detection and adjustment mechanism is designed to prevent noise, oscillation and other erratic system operation.
N-Pole
B
Bop N    Brp N
0
High
N-Pole
Magnetic flux density [mT]
Flux
High
High
Low
OUT [V]
N
N
S
S
S
N
S-Pole
Flux
S-Pole
Flux
B
Low
Brp S
Bop S
0
High
N-Pole
Magnetic flux density [mT]
Flux
High
High
OUT [V]
N
N
S
S
S
N
S-Pole
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