Data Sheet
High Sensitivity Micropower Omnipolar Hall-Effect Switch
AH9249
General Description
The AH9249 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 AH9249 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 Rating: 4000V (Human Body Model)
600V (Machine Model)
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
Figure 1. Package Types of AH9249
Jul. 2011
Rev. 1. 6
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
