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Hall ICs
AN48800A
Low current consumption, high sensitivity CMOS Hall IC One-way magnetic field operation
Unit: mm
I Overview
The AN48800A is a Hall IC (a magnetic sensor) which has 2 times or more sensitivity and a low current consumption of about one three-hundredth compared with our conventional one. In this Hall IC, a Hall element, a offset cancel circuit, an amplifier circuit, a sample and hold circuit, a Schmidt circuit, and output stage FET are integrated on a single chip housed in a small package by IC technique.
0.40+0.10 -0.05 0.10 M 3
1.50+0.25 -0.05
0.650.15 0.650.15 2.80+0.20 -0.30
(1.45)
1 0.95 0.95 1.900.20 2.90+0.20 -0.05
2
1.10+0.20 -0.10
* High sensitivity (6 mT max.) due to offset cancel circuit and a new sample and hold circuit * Small current by using intermittent action * Small package (SMD) * Open drain output
0.10
0 to 0.10
I Features
1.10+0.30 -0.10
0.400.20
0.10 to 0.30 Seating plane
MINI-3DRA (Lead-free package)
I Applications
* Flip type cellular phone, digital video camera
I Block Diagram
1
Intermittent action
VCC 2.5 V to 3.5 V
2
Out
Amplifier Hall element Offset cancel Sample and hold
Comparator
3
GND
Note) The magnetism detection time should be longer than one intermittent action cycle (On = 200 s and Off = 51 ms).
I Pin Descriptions
Pin No. 1 2 3 Symbol VCC Out GND Description Power supply Output Ground
22
0.11+0.10 -0.05
Hall IC
I Absolute Maximum Ratings
Parameter Supply voltage Symbol VCC VOUT Output current Power dissipation Operating ambient temperature Storage temperature IO PD Topr Tstg Rating 5 5 30 60 -20 to +75 -55 to +125
AN48800A
Unit V V mA mW C C
Note) 1. Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25C. 2. The reverse insertion of this IC will cause its breakdown. 3. It will operate normally in several tens of ms after power on. 4. This IC is not suitable for car electrical equipment.
I Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 2.5 to 3.5 Unit V
I Electrical Characteristics at Ta = 25C
Parameter Operating magnetic flux density 1 Operating magnetic flux density 2 Hysteresis width Output voltage Output current Supply current 1 Supply current 2 Supply current 3 Symbol BH-L BL-H BW VOL IOH ICCON ICCOFF ICCAVE VCC = 3 V VCC = 3 V VCC = 3 V VCC = 3 V, IO = 5 mA, B = 6 mT VCC = 3 V, VO = 3 V, B = 0.5 mT VCC = 3 V, B = 0.5 mT VCC = 3 V, B = 0.5 mT VCC = 3 V, B = 0.5 mT Conditions Min 0.5 Typ 1.2 0.1 2 3 10 Max 6 0.3 10 15 Unit mT mT mT V A mA A A
Note) 1. Symbol BH-L stands for the operating magnetic flux density where its output level varies from high to low. 2. Symbol BL-H stands for the operating magnetic flux density where its output level varies from low to high. 3. ICCON is a consumption current when the magnetism detection system is on, and ICCOFF is that when the magnetism detection system is off. One magnetism detection cycle is On = 200 s and Off = 51 ms. ICCAVE is an average consumption current.
23
AN48800A
I Technical Data
* Position of a Hall element (unit in mm) Distance from a package surface to sensor part: 0.39 mm (reference value) A Hall element is placed on the shaded part in the figure. 0.5
1.2
Hall IC
0.39 0.5
0.5
* Magneto-electro conversion characteristics S
Output voltage
BL-H BW
BH-L N Direction of applied magnetic field
Applied magnetic flux density B
Operating magnetic flux density
* Simple polarity distinction method of mounting magnet to product incorporating Hall IC
Magnet
Plastic bar
Plastic cover
Magnet for Hall IC
A magnet, which is used in pair with a Hall IC, can be mounted to a product incorporating a built-in Hall IC (e.g., a cellular phone) smoothly and correctly with a simple tool. The polarity of the magnet (hereafter referred to as Hall IC magnet) will be automatically discriminated. This tool is a plastic bar, one end of which is attached with a small magnet (hereafter referred to as plastic bar magnet), as shown in the above illustration. The plastic bar magnet, the polarity of which is known, is secured on the bar with a plastic cover. When the plastic bar magnet is located close to the Hall IC magnet, the Hall IC magnet will be attracted to the plastic bar magnet. The contact side of the Hall IC magnet is different in polarity from that of the plastic bar magnet. As a matter of course, the polarity of the Hall IC magnet will be known then. The Hall IC magnet can be mounted to the appliance in this state. The attraction force of the plastic bar magnet is rather weak due to the plastic cover on it. Therefore, the plastic bar can be separated from the Hall IC magnet with ease after the Hall IC magnet is mounted properly.
24
Hall IC
I Technical Data (continued)
* Main characterisitcs Operating magnetic flux density Supply voltage
2.0 Ta = 25C
AN48800A
Operating magnetic flux density Ambient temperature
6 VCC = 3.0 V
Sample 1 BH-L
Operating magnetic flux density B (mT)
Sample 1 BW 1.5 Sample 2 BW 1.0 Sample 3 BW
Operating magnetic flux density B (mT)
5
Sample 3 BH-L
Sample 1 B L-H
4 Sample 2 BH-L 3
Sample 3 B L-H
0.5
Sample 2 BL-H 2 -25 0 25 50 75
0 2 2.5 3 3.5 4 4.5 5
Supply voltage VCC (V)
Ambient temperature Ta (C)
Operating magnetic flux density Supply voltage
6 Ta = 25C
Sample 2 BH-L
Average consumption current Supply voltage
25 Output = High
Operating magnetic flux density B (mT)
5
Sample 2 BL-H
20
4
Sample 1 BH-L Sample 1 BL-H
Supply current ICC (A)
15
3
2
Sample 3 BH-L Sample 3 BL-H
10 -50C 25C 125C
5
1
0 2 2.5 3 3.5 4 4.5 5
0 0 1 2 3 4 5 6
Supply voltage VCC (V)
Supply voltage VCC (V)
Low-level output voltage Supply voltage
0.20 IO = 5 mA
Low-level output voltage Ambient temperature
0.14 VCC = 3.0 V
Low-level output voltage VOL (V)
0.15 75C 0.10 25C -25C -50C 0.05
Low-level output voltage VOL (V)
0.12 0.10 0.08 0.06 0.04 0.02 0.00 -50
0.00 0 1 2 3 4 5 6
-25
0
25
50
75
100
125
Supply voltage VCC (V)
Ambient temperature Ta (C)
25

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