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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 ime or awake time. This function will reduce the verage operating current of the IC. During the wake time, the output is changed with the magnetic lux density. During the sleep time, the output is atched in its previous state and the current consumption will reduce to some ?A. 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.
