Diodes AH9248 - Manual

Data Sheet
High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248
Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited
1
General 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.
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 (AH9249)
Applications
•
Cover Switch in Notebook PC/PDA
• Handheld Wireless Application Awake Switch
• Magnet Switch in Low Duty Cycle Applications
Figure 1. Package Types of AH9248
TO-92S-3 SOT-23-3 DFN-2Ч2-3