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BU52021HFV-TR

更新时间： 2024-01-10 05:57:45

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BU52021HFV-TR 数据手册

BU52001GUL,BU52011HFV,BU52021HFV,

BU52015GUL,BU52025G,BU52051NVX, BD7411G

Technical Note

●Intermittent Operation at Power ON

Power ON

VDD

Startup time

Standby time

High

Standby time

Startup time

Supply current

(Intermittent action)

Indefinite

OUT

(No magnetic

field present)

Indefinite

OUT

(Magnetic

field present)

Low

Fig.38

The Omnipolar detection Hall IC adopts an intermittent operation method in detecting the magnetic field during startup, as

shown in Fig. 38. It outputs to the appropriate terminal based on the detection result and maintains the output condition

during the standby period. The time from power ON until the end of the initial startup period is an indefinite interval, but it

cannot exceed the maximum period, 100ms. To accommodate the system design, the Hall IC output read should be

programmed within 100ms of power ON, but after the time allowed for the period ambient temperature and supply voltage.

※BD7411G don’t adopts an intermittent operation method.

●Magnet Selection

Of the two representative varieties of permanent magnet, neodymium generally offers greater magnetic power per volume

than ferrite, thereby enabling the highest degree of miniaturization, Thus, neodymium is best suited for small equipment

applications. Fig. 39 shows the relation between the size (volume) of a neodymium magnet and magnetic flux density. The

graph plots the correlation between the distance (L) from three versions of a 4mm X 4mm cross-section neodymium magnet

(1mm, 2mm, and 3mm thick) and magnetic flux density. Fig. 40 shows Hall IC detection distance – a good guide for

determining the proper size and detection distance of the magnet. Based on the BU52011HFV, BU52015GUL operating

point max 5.0 mT, the minimum detection distance for the 1mm, 2mm and 3mm magnets would be 7.6mm, 9.22mm, and

10.4mm, respectively. To increase the magnet’s detection distance, either increase its thickness or sectional area.

t=3mm

t=1mm

t=2mm

7.6mm 9.2mm

10.4mm

Distance between magnet and Hall IC [mm]

Fig.39

Magnet material: NEOMAX-44H (material)

Maker: NEOMAX CO.,LTD.

Magnet

X=Y=4mm

t=1mm,2mm,3mm

L: Variable

…Flux density measuring point

Magnet size

Fig.40 Magnet Dimensions and

Flux Density Measuring Point

www.rohm.com

2010.01 - Rev.C

14/19

1...11 12 131415 16 17...20

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