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Data Sheet

High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9249

Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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

), the output will be turned on; if

it is less than releasing point(B

), 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

Figure 1. Package Types of AH9249

TO-92S-3 SOT-23-3 DFN-2×2-3

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