26
Hall ICs
AN48810B
Low current consumption, high sensitivity CMOS Hall IC
One-way magnetic field operation
■Overview
The AN48810B is a Hall IC (a magnetic sensor) which
has 2 times or more sensitivity and a low current consump-
tion of about one three-hundredth compared with our con-
ventional 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.
■Features
•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)
•CMOS inverter output
■Applications
•Flip type cellular phone, digital video camera
■Block Diagram
Unit: mm
SMINI-5DA (Lead-free package)
4
3
5
12
3
4
21
5
0.225
0.225
2.10
±0.10
1.65
±0.10
1.30
±0.10
Seating plane
0.80
±0.10
0 to 0.10
0.32
±0.10
2.00
±0.10
0.22
+0.10
-
0.05
0.11
+0.10
-
0.05
0.65 0.65
M
0.13
0.10
On/Off controlCLK
VCC N.C.
GND
1Out
2
53
N.C.
4
Sample
and
hold
Hall
element
Amplifier
Switch
■Pin Descriptions
Note) The magnetism detection time should be longer than one intermittent action cycle (On = 200 µs and Off = 51 ms).
Pin No. Symbol Description
4 N.C.
5V
CC Power supply
Pin No. Symbol Description
1 Out Output
2 GND Ground
3 N.C.
27
Hall IC
■Recommended Operating Range
Parameter Symbol Range Unit
Supply voltage VCC 2.5 to 3.5 V
■Absolute Maximum Ratings
Parameter Symbol Rating Unit
Supply voltage VCC 5V
VOUT 5V
Output current IO15 mA
Power dissipation PD60 mW
Operating ambient temperature Topr −20 to +75 °C
Storage temperature Tstg −55 to +125 °C
Note) 1. Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.
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.
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 µs and Off = 51 ms. ICCAVE is an average consumption current.
■Electrical Characteristics at Ta = 25°C
Parameter Symbol Conditions Min Typ Max Unit
Operating magnetic flux density 1 BH-L VCC = 3 V 6mT
Operating magnetic flux density 2 BL-H VCC = 3 V 0.5 mT
Hysteresis width BW VCC = 3 V 1.2 mT
Output voltage 1 VOL VCC = 3 V, IO = 2 mA, B = 6 mT 0.1 0.3 V
Output voltage 2 VOH VCC = 3 V, IO = −2 mA, B = 0.5 mT 2.7 2.9 V
Supply current 1 ICCON VCC = 3 V, B = 0.5 mT 2mA
Supply current 2 ICCOFF VCC = 3 V, B = 0.5 mT 3µA
Supply current 3 ICCAVE VCC = 3 V, B = 0.5 mT 10 15 µA
■Technical Data
•Position of a Hall element (unit in mm)
Distance from a package surface to sensor part: 0.31 mm (reference value)
A Hall element is placed on the shaded part in the figure.
0.31
1.0
1.0
AN48810B
28
Hall IC
■Technical Data (continued)
•Magneto-electro conversion characteristics
BW
B
H-L
B
L-H
Output voltage
Direction of applied magnetic field Operating magnetic flux density
Applied magnetic flux density B
S
N
•Simple polarity distinction method of mounting magnet to product incorporating 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.
Plastic coverPlastic bar Magnet for Hall IC
Magnet
•Main characterisitcs
Operating magnetic flux density Supply voltage Operating magnetic flux density Ambient temperature
0
0.5
1.0
1.5
2.0
2342.5 3.5 4.5 5
Supply voltage V
CC
(V)
Operating magnetic flux density B (mT)
T
a
= 25°C
Sample 1 BW
Sample 2 BW
Sample 3 BW
2
3
4
5
6
−25 0 25 50 75
Ambient temperature Ta (°C)
Operating magnetic flux density B (mT)
V
CC
= 3.0 V
Sample 1 B
H-L
Sample 2 B
H-L
Sample 3 B
H-L
Sample 3 B
L-H
Sample 1 B
L-H
Sample 2 B
L-H
AN48810B
29
Hall IC
■Technical Data (continued)
•Main characterisitcs
Operating magnetic flux density Supply voltage Average consumption current Supply voltage
Low-level output voltage Supply voltage Low-level output voltage Ambient temperature
∆ high-level output voltage Supply voltage ∆ high-level output voltage Ambient temperature
−50
Ambient temperature Ta (°C)
VCC = 3.0 V
125−25 0 25 50 75 100
0.00
0.07
Low-level output voltage VOL (V)
0.01
0.02
0.03
0.04
0.05
0.06
0.00
0.14
0
Supply voltage V
CC
(V)
∆ hgh-level output voltage ∆V
OH
(V)
I
O
= −2 mA
0.02
0.04
0.06
0.08
0.10
0.12
125°C
−25°C
−50°C
241356
75°C
25°C
0.00
0.07
0
Supply voltage V
CC
(V)
Low-level output voltage V
OL
(V)
I
O
= 2 mA
0.01
0.02
0.03
0.04
0.05
0.06
241356
75°C
25°C
125°C
−25°C
−50°C
0.00
0.14
−50
Ambient temperature Ta (°C)
∆ hgh-level output voltage ∆VOH (V)
V
CC
= 3.0 V
0.02
0.04
0.06
0.08
0.10
0.12
125
−25 0 25 50 75 100
0
5
10
15
20
25
0
Supply voltage VCC (V)
Average consumption current ICCAVE (µA)
241356
−50°C
125°C
25°C
Output = High
0
1
2
3
4
5
6
2342.5 3.5 4.5 5
T
a
= 25°C
Sample 2 B
H-L
Sample 2 B
L-H
Sample 1 B
H-L
Sample 1 B
L-H
Sample 3 B
H-L
Sample 3 B
L-H
Supply voltage V
CC
(V)
Operating magnetic flux density B (mT)
AN48810B
