NOT RECOMMENDED FOR NEW DESIGN
USE
AH1808
AH9248
HIGH SENSITIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH
Description
The AH9248 is an ultra-sensitive Hall-effect switch with digital latched
output, mainly designed for battery-operation, hand-held equipments.
Special CMOS process is used for low-voltage and low-power
requirement. A chopper stabilized amplifier improves stability of
magnetic switch points. A sleep-awake logic controls the IC in sleep
time or awake time. This function will reduce the average operating
current of the IC. During the awake time, the output is changed with
the magnetic flux density. During the sleep time, the output is latched
in its previous state and the current consumption will reduce to some
μA.
The IC switching behaviour is omnipolar, either north or south pole
sufficient strength will turn the output on. If the magnetic flux density
is larger than operating point (B
OP
), the output will be turned on; if it is
less than releasing point (B
RP
), the output will be turned off.
The AH9248 is available in TO-92S-3, SOT-23-3 and DFN-2×2-3
packages which are optimized for most applications.
Pin Assignments
(Front View)
3
2
1
OUTPUT
GND
VCC
TO-92S-3
(Top View)
Pin 1 Mark
VCC
1
2
3
1
OUTPUT
3
GND
GND
VCC
OUTPUT
2
Features
Micropower Operation
2.5V to 5.5V Power Supply
Switching for Both Poles of a Magnet (Omnipolar)
Stabilized Chopper
Superior Temperature Stability
Digital Output Signal
Built-in Pull-up Resistor (AH9249)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
SOT-23-3
DFN-2×2-3
Applications
Cover Switch in Notebook PC/PDA
Handheld Wireless Application Awake Switch
Magnet Switch in Low Duty Cycle Applications
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
100k
100pF
2
OUTPUT
1
VCC
10nF
AH9248
GND
2.5V
to
5.5V
3
AH9248
Document number: DS39690 Rev. 2 - 3
1 of 14
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April 2017
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE
AH1808
AH9248
Pin Descriptions
Pin Number
Pin Name
TO-92S-3
1
2
3
SOT-23-3
1
3
2
DFN-2×2-3
1
3
2
VCC
GND
OUTPUT
Power supply pin
Ground pin
Output pin
Function
Functional Block Diagram
VCC
1 (1)
Sleep/Awake
Control
Timing
Logic
Bias
Hall
Plate
Chopper
Comparator
2 (3)
3 (2)
OUTPUT
GND
A (B)
A for TO-92S-3
B for SOT-23-3 and DFN-2×2-3
AH9248
Document number: DS39690 Rev. 2 - 3
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April 2017
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE
AH1808
AH9248
Absolute Maximum Ratings
(@T
A
=+25
o
C, Note 4)
Symbol
V
CC
I
CC
V
OUT
I
OUT
B
Supply Voltage
Supply Current (Fault)
Output Voltage
Output Current
Magnetic Flux Density
TO-92S-3
P
D
Power Dissipation
SOT-23-3
DFN-2×2-3
T
STG
T
J
ESD
Storage Temperature
Junction Temperature
ESD (Machine Model) (Note 5)
-55 to +150
+150
200
Parameter
Rating
7
6
7
2
Unlimited
400
230
230
C
C
V
mW
Unit
V
mA
V
mA
Gauss
Notes: 4. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
5. Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever
handling semiconductor products.
Recommended Operating Conditions
Symbol
V
CC
T
OP
Supply Voltage
Operating Temperature
Parameter
Min
2.5
-40
Max
5.5
+85
Unit
V
C
Electrical Characteristics
(@T
A
=+25
o
C, V
CC
=3V, unless otherwise specified.)
Symbol
V
CC
I
AW
I
SL
I
AVG
I
OUT
I
LEAK
V
SAT
t
AW
t
SL
D
f
C
Output Current
Output Leakage Current
Saturation Voltage
Awake Mode Time
Sleep Mode Time
Duty Cycle
Chopper Frequency
Supply Current
Parameter
Supply Voltage
Operating
Awake
Sleep
Average
—
B<︱B
RP
︱
I
OUT
=1.0mA
Operating
Operating
—
—
Conditions
Min
2.5
—
—
—
—
—
—
—
—
—
—
Typ
3
2
6
10
—
<0.1
—
150
90
0.15
15
Max
5.5
4
10
15
1.0
1
0.4
—
120
—
—
Unit
V
mA
µA
µA
mA
µA
V
µs
ms
%
kHz
AH9248
Document number: DS39690 Rev. 2 - 3
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April 2017
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE
AH1808
AH9248
Magnetic Characteristics
(@T
A
=+25
o
C, V
CC
=3V, unless otherwise specified. Note 6)
Symbol
B
OPS
Operating point
B
OPN
B
RPS
Releasing Point
B
RPN
B
HYS
Notes:
Parameter
Conditions
South pole to branded side
B>B
OPS
,V
OUT
=low(output on)
North pole to branded side
B>B
OPN
,V
OUT
=low(output on)
South pole to branded side
B<B
RPS
,V
OUT
=high(output off)
North pole to branded side
B<B
RPN
,V
OUT
=high(output off)
︱B
OPX
- B
RPX
︱(Note
7)
Min
—
-55
5
—
—
Typ
30
-30
20
-20
10
Max
55
—
—
-5
—
Unit
Gauss
Gauss
Gauss
Gauss
Gauss
Hysteresis
6. The specifications stated here are guaranteed by design. 1 Gauss=0.1mT
7. B
OPX
=operating point (output turns on); B
RPX
=releasing point (output turns off)
Output Off
High
B
OPN
B
OPS
Output Voltage
B
RPN
Low
-B
0
B
RPS
Output On
+B
Magnetic Flux Density (Gauss)
Output Voltage vs. Magnetic Flux Density
AH9248
Document number: DS39690 Rev. 2 - 3
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April 2017
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE
AH1808
AH9248
Test Conditions
I
CC
A
VCC
AH9248
OUTPUT
GND
Average Supply Current (Note 8, Note 9)
Note 8: I
CC
represents the average supply current. OUTPUT is open during measurement.
Note 9: The device is put under magnetic field with B<B
RP
.
OUTPUT
AH9248
1mA
GND
VCC
V
V
SAT
Output Saturation Voltage (Note 10, Note 11)
Note 10: The output saturation voltage V
SAT
is measured at V
CC
=2.5V and V
CC
=5.5V.
Note 11: The device is put under magnetic field with B>B
OP
.
100k
OUTPUT
AH9248
VCC
V
GND
Magnetic Thresholds (Note 12, Note 13)
Note 12: B
OP
is determined by putting the device under magnetic field swept from B
RP
(min) to B
OP
(max) until the output is switched on.
Note 13: B
RP
is determined by putting the device under magnetic field swept from B
OP
(max) to B
RP
(min) until the output is switched off.
AH9248
Document number: DS39690 Rev. 2 - 3
5 of 14
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April 2017
© Diodes Incorporated
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