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AH9247 Datasheet PDF - BCD

Part Number AH9247
Description High Sensitivity Micropower Omnipolar Hall-Effect Switch
Manufacturers BCD 
Logo BCD Logo 

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AH9247 datasheet, circuit
Data Sheet
High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9247
General Description
The AH9247 is an ultra-sensitive Hall-effect switch
with digital latched output, mainly designed for
battery-operation, handheld 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 (BOP), the output will be turned on; if
it is less than releasing point (BRP), the output will be
turned off.
The AH9247 is available in TO-92S-3, SOT-23-3 and
DFN-2×2-3 packages which are optimized for most
applications.
Features
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
• ESD (HBM) 6000V
Applications
Cover Switch in Notebook PC/PDA
• Handheld Wireless Application Awake Switch
• Magnet Switch in Low Duty Cycle Applications
TO-92S-3
SOT-23-3
DFN-2×2-3
Mar. 2013 Rev. 2. 0
Figure 1. Package Types of AH9247
BCD Semiconductor Manufacturing Limited
1

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AH9247 equivalent
Data Sheet
High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9247
Electrical Characteristics
VCC=3V, TA=25°C, unless otherwise specified.
Parameter
Supply Voltage
Supply Current
Output Current
Saturation Voltage
Awake Mode Time
Sleep Mode Time
Duty Cycle
Chopper Frequency
Symbol
Conditions
VCC Operating
IAW Awake
ISL Sleep
IAVG Average
IOUT
VSAT IOUT=1.0mA
tAW Operating
tSL Operating
D
fC
Min Typ Max Units
2.5 3 5.5 V
1.8 3 mA
4 10 μA
8 15 μA
1.0 mA
0.4 V
120 μs
80 120 ms
0.15 %
15 kHZ
Magnetic Characteristics (Note 3)
VCC=3V, TA=25°C, unless otherwise specified.
For TO-92S-3 Package
Parameter
Operating Point
Releasing Point
Hysteresis
Symbol
BOPS
BOPN
BRPS
BRPN
BHYS
Conditions
South pole to branded side
B>BOPS,VOUT=low(output on)
North pole to branded side
B>BOPN,VOUT=low(output on)
South pole to branded side
B<BRPS,VOUT=high(output off)
North pole to branded side
B<BRPN,VOUT=high(output off)
BOPX - BRPX(Note4)
Min
15
-55
5
-45
Typ
30
-30
20
-20
10
Max
55
-15
45
-5
Unit
Gauss
Gauss
Gauss
Gauss
Gauss
Mar. 2013 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
5

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Information Total 16 Pages
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