BU52011HFV-TR Rohm Semiconductor, BU52011HFV-TR Datasheet - Page 15

• Manufacturer Part Number: BU52011HFV-TR
• Description: Industrial Hall Effect / Magnetic Sensors ULTRA SMALL DETECT SENSOR; 1.65-3.3V
• Manufacturer: Rohm Semiconductor
• Series: -r
• Type: Omnipolar Switchr

Specifications of BU52011HFV-TR

• Operational Type: Bipolar
• Operating Supply Voltage: 1.8 V or 2.5 V
• Current Rating: 5 uA
• Operating Point Min/max: - 5 mT to 5 mT
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Maximum Output Current: 0.5 mA
• Package / Case: HVSOF
• Hall Effect Type: Bipolar
• Output Current: 500µA
• Power Dissipation Pd: 536mW
• Sensor Case Style: HVSOF
• No. Of Pins: 5
• Supply Voltage Range: 1.65V To 3.3V
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC
• Sensing Range: ±5mT Trip, ±0.6mT Release
• Voltage - Supply: 1.65 V ~ 3.3 V
• Current - Supply: 8µA
• Current - Output (max): ±0.5mA
• Output Type: Digital, Open Collector
• Features: -
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

●Intermittent Operation at Power ON
●Magnet Selection
Y
※BD7411G don’t adopts an intermittent operation method.
The bipolar 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.
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.
Magnet size
(Intermittent action)
Supply current
10
9
8
7
6
5
4
3
2
1
0
(Magnetic
OUT
VDD
OUT
(No magnetic
field present)
field present)
0
X
Power ON
Fig.40 Magnet Dimensions and
2
Flux Density Measuring Point
X=Y=4mm
t=1mm,2mm,3mm
Startup time
t
t=1mm
Indefinite
Indefinite
4
Distance between magnet and Hall IC [mm]
6
7.6mm
8
Standby time
9.2mm 10.4mm
Fig.39
High
Low
t=3mm
10
L: Variable
Magnet
15/20
Fig.38
…Flux density measuring point
t=2mm
12
t
Startup time
14
16
Magnet material: NEOMAX-44H (material)
Maker: NEOMAX CO.,LTD.
18
Standby time
20