Individual Specification
20
AN48800A
Low current consumption, high sensitivity CMOS Hall IC
One-way magnetic field operation
■ 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.
■ Features
High sensitivity (6 mT max.) due to offset cancel circuit and a new
sample and hold circuit
Small current by using intermittent action (10 µA typ.)
Small package (SMD)
Open drain output
■ Applications
Flip type cellular phone, digital video camera
■ Block Diagram
1VCC 2.5 V to 3.5 V
3GND
2Out
Sample
and
hold
Offset
cancel
Hall
element
Comparator
Amplifier
Intermittent action
Note) The magnetism detection time should be longer than one intermittent action cycle (On = 200 µs and Off = 51 ms).
■ Pin Descriptions
Pin No. Symbol Description
1VCC Power supply
2Out Output
3GND Ground
2
3
1
0.11+0.10
−0.05
Seating plane
0 to 0.10
0.40±0.20
1.10+0.30
−0.10
0.10 to 0.30
1.10
+
0.20
−
0.10
1.50+0.25
−0.05
0.40+0.10
−0.05
(1.45)
0.65±0.15
2.80+0.20
−0.30
1.90±0.20
0.65±0.15
2.90+0.20
−0.05
0.95 0.95
0.10
M
0.10
Unit : mm
MINI-3DRA (Lead-free package)
AN48800A
21
■ Absolute Maximum Ratings
Parameter Symbol Rating Unit
Supply voltage VCC 5V
Output voltage VOUT 5V
Supply current ICC 5mA
Output current IOUT 30 mA
Power dissipation *1, *2PD60 mW
Operating ambient temperature *1Topr −20 to +75 °C
Storage temperature *1Tstg −55 to +125 °C
Note) *1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.
*2: Ta = 75°C. For the independent IC without a heat sink. Please use within the range of power dissipation, refering to PD Ta curve.
■ Recommended Operating Range
Parameter Symbol Range Unit
Supply voltage VCC 2.5 to 3.5V
■ Electrical Characteristics Ta = 25°C ± 2°C
Parameter Symbol Conditions Min Typ Max Unit
Operating magnetic flux density 1
*1BH-L VCC = 3 V 6mT
Operating magnetic flux density 2
*2BL-H VCC = 3 V 0.5 mT
Output voltage VOL VCC = 3 V, IO = 5 mA, B = 6.0 mT 0.1 0.3V
Output current IOH VCC = 3 V, VO = 3 V, B = 0.5 mT 10 µA
Supply current 1 *3ICCAVE VCC = 3 V, B = 0.5 mT 10 15 µA
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: ICCAVE = {ICCON × tON + ICCOFF × tOFF}/{tON + tOFF}
Design reference data
Parameter Symbol Conditions Min Typ Max Unit
Hysteresis width 1BW VCC = 3 V 1.2mT
Supply current 2ICCON VCC = 3 V, B = 0.5 mT 2mA
Supply current 3ICCOFF VCC = 3 V, B = 0.5 mT 3 µA
Operating time tON VCC = 3 V 200 µs
Stop time tOFF VCC = 3 V 51 ms
Note) It will operate normally in approximately 51 ms after power on.
Individual Specification
22
■ 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
0.5
1.2
0.39
0.5
Magneto-electro conversion characteristics
S
N
BW
BH-L
BL-H
Output voltage
Direction of a
pp
lied ma
g
netic field Operating magnetic flux density
Applied magnetic flux density B
Simple polarity distinction method of mounting magnet to product incorporating Hall IC
Plastic cover
Plastic bar Magnet for Hall IC
Magnet
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.
AN48800A
23
■ Technical Data (continued)
Main characterisitcs
Operating magnetic flux density Supply voltage
Operating magnetic flux density
Ambient temperature
0
0.5
1.0
1.5
2.0
2 3 42.5 3.5 4.5 5
AN48800A_Tokusei01
Ta = 25°C
Sample 1 BW
Sample 2 BW
Sample 3 BW
Supply voltage VCC (V)
Operating magnetic flux density B (mT)
2
3
4
5
6
−25 0 25 50 75
AN48800A_Tokusei02
VCC = 3.0 V
Sample 1 B
H-L
Sample 2 BH-L
Sample 3 B
H-L
Sample 3 B
L-H
Sample 1 B
L-H
Sample 2 BL-H
Ambient temperature Ta (°C)
Operating magnetic flux density B (mT)
Operating magnetic flux density Supply voltage Average consumption current Supply voltage
2 3 42.5 3.5 4.5 5
AN48800A_Tokusei03
Ta = 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
0
1
2
3
4
5
6
Supply voltage VCC (V)
Operating magnetic flux density B (mT)
Low-level output voltage Supply voltage Low-level output voltage Ambient temperature
0.00
0.05
0.10
0.15
0.20
0
AN48800A_Tokusei05
IO = 5 mA
75
°C
25°C
−25°C
−50°C
2 41 3 5 6
Supply voltage VCC (V)
Low-level output voltage VOL (V)
0.00
0.14
−50 −25 0 25 50 75 100 125
AN48800A_Tokusei06
VCC = 3.0 V
0.02
0.04
0.06
0.08
0.10
0.12
Low-level output voltage VOL (V)
Ambient temperature Ta (°C)