Datasheet > BU52040HFV_10

BU52040HFV_10

更新时间： 2022-12-20 16:45:58

品牌	Logo	应用领域
罗姆 - ROHM		/
页数	文件大小	规格书
13页	348K
描述
Bipolar Latch Hall IC

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BU52040HFV_10 数据手册

Technical Note

BU52040HFV

●Intermittent Operation at Power ON

VDD

Startup time

Standby time

High

Standby time

Startup time

Supply current

(Intermittent operation)

Indefinite

OUT

(N magnetic field present)

(B<B_rp)

Indefinite interval

OUT

(S magnetic field present)

(B_op<B)

Low

Indefinite interval

OUT

(No magnetic field present)

(B_rp<B< B_op)

Fig.17

The Hall Effect IC for wheel keys / trackballs adopts an intermittent operation method in detecting the magnetic field during

startup, as shown in Fig. 17. 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, 1200μs. To accommodate the system design, the Hall IC output read should be

programmed within 1200μs of power ON, but after the time allowed for the period ambient temperature and supply voltage.

Additionally, if a magnetic flux density (B) of magnitude greater than B_rpbut less than B_opis applied at power ON, the output

from the IC remains undefined and will be either high or low until a flux density exceeding the B_opor B_rpthreshold is applied.

●Application Example

Wheel Key

Two Hall ICs can enable detection of rotation direction of a magnetic zero-contact wheel key.

Circular magnet

BU52040HFV: 2pcs

Mounting Position of Hall IC Inside Wheel Key

The angular separation of the two Hall ICs within the footprint of the wheel key depends on N/S division angle of the internal

magnet (Φ), and can be set to either Φ/4 or ¾Φ. Mounting the two ICs in this position causes the magnetic phase

difference between the ICs to equal ±1/4, and the direction of rotation can be detected by measuring the change in this

difference. An example of the magnetic field characteristics for this application is shown in the figure below.

N/S division angle of circular magnet = Φ

1) Mounting angle of Hall IC = Φ/4

Φ/4

2) Mounting angle of Hall IC = ¾Φ

3/4 Φ

Counterclockwise

rotation

Clockwise

rotation

Hall IC B

Hall IC A

Center of magnet

Mounting Angle of Hall IC

Circular Magnet

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2010.01 - Rev.B

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