Product Brief
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.
AH9248
Parametric Table
Supply Voltage (V)
Supply Current (Average) (µA)
Output Saturation Voltage
(V
CC
=3V, I
OUT
=1mA) (V) (Max)
Operating Point (Gauss)
Releasing Point (Gauss)
Hysteresis (Gauss)
2.5 to 5.5
10
0.4
±30
±20
10
Benefits
•
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•
•
Low Average Current (8µA Typ.)
High Sensitivity
High Stability of the Magnetic Switching
Points
Operation Low to 2.5V
Cost-effect Solution
Features
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•
•
•
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•
•
Micropower Operation
2.5 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)
Additional Available Materials
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•
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•
Samples
Preliminary Datasheet
Reliability Report
ESD Report
Applications
•
•
•
Cover Switch in Notebook PC/PDA
Handheld Wireless Application Awake
Switch
Magnet Switch in Low Duty Cycle
Applications
May. 2010
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
