Hall ICs
DN8798MS
3 V operation Hall IC
s
Overview
The DN8798MS is a 3 V operation Hall IC which
includes a Hall element, amplifier circuit, Schmidt circuit,
stabilized power supply and temperature compensation
circuit which are integrated on a single chip with a fine
patterning technology. The magnetic input signal is out-
putted by being converted to high or low. We have im-
proved the conventional circuit to realize a stable opera-
tion covering from low to high supply voltage and from
low to high temperature.
10°
+ 0.20
0 to 0.1 1.10
– 0.10
0.30
1.10
+ 0.10
–
Unit: mm
1.45
0.40
+ 0.10
– 0.05
3
1.50
+ 0.25
– 0.05
2.80
+ 0.20
– 0.30
0.40
± 0.20
0.65
± 0.15
0.16
+ 0.10
– 0.06
1
0.95
2
0.65
± 0.15
0.95
1.90
± 0.20
+
2.90
– 0.20
0.05
s
Features
•
Wide operating supply voltage range
(V
CC
=
2.7 V to 14.4 V)
•
Wide operating ambient temperature (−40°C to
+85°C)
•
Package: Mini type (3-pin type)
(1.1 mm thick: Same as a standard transistor)
MINI-3D
s
Applications
•
DC brushless motor, fan motor, rotation sensor, detection of cover open/close (example for a cellular phone),
position sensor
s
Block Diagram
V
CC
Constant
voltage source
2
5°
Comparator
Hall element
Amplifier
1
Out
GND
3
1
DN8798MS
s
Pin Descriptions
Pin No.
1
2
3
Symbol
Out
V
CC
GND
Description
Output pin
Supply voltage pin
Ground pin
Hall ICs
s
Absolute Maximum Ratings
Parameter
Supply voltage
Symbol
V
CC
V
OUT
Supply current
Power dissipation
Operating ambient temperature
Storage temperature
I
CC
P
D
T
opr
T
stg
Rating
18
18
120
−40
to
+85
−55
to
+125
mA
mW
°C
°C
Unit
V
Note) 1. Except for the operating ambient temperature and storage temperature, all ratings are for T
a
=
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 designed for a general use and if you want to use for an automotive use, please consult our staff of the nearby
sales office beforehand.
s
Recommended Operating Range
Parameter
Supply voltage
Symbol
V
CC
Range
2.7 to 14.4
Unit
V
s
Electrical Characteristics at T
a
=
25°C
Parameter
Operating magnetic flux density 1
Operating magnetic flux density 2
Hysteresis width
Output voltage 1
Output voltage 2
Output current
Supply current 1
Supply current 2
Symbol
BH-L
BL-H
BW
V
OL1
V
OL2
I
OH
I
CC1
I
CC2
V
CC
=
3 V
V
CC
=
3 V
V
CC
=
3 V
V
CC
=
14.4 V, I
O
=
5 mA, B
= −15
mT
V
CC
=
2.7 V, I
O
=
5 mA, B
= −15
mT
V
CC
=
2.7 V to 14.4 V
V
O
=
14.4 V, B
=
15 mT
V
CC
=
14.4 V, B
=
15 mT
V
CC
=
2.7 V, B
=
15 mT
Conditions
Min
−15
4
1.0
1.0
Typ
8
0.07
0.07
3.4
2.5
Max
15
12
0.30
0.30
10
6.0
6.0
Unit
mT
mT
mT
V
V
µA
mA
mA
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. The variation of operating magnetic flux density does not depend on supply voltage due to its built-in stabilized power
source. (V
CC
should be confined to the range of 2.7 V to 14.4 V.)
4. A supply current changes by maximum 1 mA when its output level varies from high to low.
2
Hall ICs
s
Caution on use of Hall ICs
DN8798MS
As the Hall IC is often used to detect movement, the position of a Hall IC may be changed, and there is the risk of
a change in detection level, if exposed to shock or vibration over a long period of time. Secure the IC by applying
adhesive to the package or placing in a dedicated case.
1. On mounting of the surface mount type (MINI-3D package)
When mounted on the printed circuit board, the Hall IC may be highly stressed by the warping that may occur from
soldering. This may also cause a change in the operating flux density characteristic and a deterioration of its resistance
to moisture.
2. On using flux in soldering
Choose a flux which does not include ingredients from halogen group, such as chlorine, fluorine, etc. The
ingredients of halogen group may enter where the lead frame and package resin joint, causing corrosion and the
disconnection of the aluminum wiring on the surface of an IC chip.
3. On fixing a Hall IC with the holder
When a Hall IC is mounted on the printed circuit board with a holder and the coefficient of expansion of the holder
is large, the lead wire of the Hall IC will be stretched and it may give a stress to the Hall IC.
If the lead wire is stressed intensely due to the distortion of holder or board, the adhesives between the package and
the lead wire may be weakened and cause a minute gap resulting in the deterioration of its resistance to moisture.
Sensitivity may also be changed by this stress.
4. Power supply line/power transmission line
If a power supply line/power transmission line becomes longer, noise and/or oscillation may be found on the line.
In this case, set the capacitor of 0.1
µF
to 10
µF
near a Hall IC to prevent it.
If a voltage of 18 V or more is thought to be applied to the power supply line (flyback voltage from coil or the ignition
pulse, etc.), avoid it with external components (capacitor, resistor, Zener diode, diode, surge absorbing elements, etc.).
5. V
CC
and GND
Do not reverse V
CC
and GND. If the V
CC
and GND pins are reversely connected, this IC will be destroyed. If the
IC GND-pin voltage is set higher than other pin voltage, the IC configuration will become same as a forward biased
diode. Therefore, it will turn on at the diode forward voltage (approximately 0.7 V), and a large current will flow through
the IC, ending up in its destruction. (This is common to Monolithic IC.)
6. Cautions on power ON of Hall IC
When a Hall IC is turned ON, the position of the magnet or looseness may change the output of a Hall IC, and a
pulse may be generated. Therefore, care should be given whenever the output state of a Hall IC is critical when the
supply power is ON.
3
RF/Wirelessly
京公网安备 11010802033920号
EEWORLD
