The MLX90248 from Melexis, a member of the Omnipolar family, is a micropower Hall effect switch. The MLX90248 employs CMOS technology to enable the non-contact magnetic switching function for applications such as flip, slide and clamshell portable handsets. The MLX90248 detects the opening action to wake up the device main functions and prepare for immediate use by the operator.
The device can be activated by either a North magnetic field or a South magnetic field. The device switches on in the presence of sufficiently strong magnetic field facing the marked side of the package. The output switches off in the absence of a magnetic field. The device consumes 8 µA at 2.5 V. The circuit employs a clocking mechanism to cycle power to the Hall element and analog signal processing units. Sensing takes place every 70 ms (maximum). Engineering samples are available now, with production scheduled for the second quarter priced at $0.31 for 50,000 pieces.