Data Sheet ADL-Series Nanopower Digital Switches Key Features Ultraminiature 1.1 mm x 1.1 mm x 0.45 mm ULLGA package Precise Detection of Low Magnetic Fields Low Voltage Operation to 2.4 V Typical Power Consumption As Low As 72 nW at 2.4 V Digital Switch Output Continuously Operating or Duty-Cycled Versions Description ADL-Series sensors are Giant Magnetoresistive (GMR) Digital Switches designed to run at low voltages and extremely low currents. The devices are manufactured with NVEs patented spintronic GMR technology for unmatched miniaturization, sensitivity, precision, and low power. NVEs new ULLGA leadless package measures just 1.1 mm x 1.1 mm x 0.45 mm. Bare die (0.625 mm x 0.625 mm) are also available for extremely space-critical applications. Configured as a magnetic switch, the output turns on when the magnetic field is applied, and turns off when the field is removed. The applied magnetic field can be of either polarity, and the magnetic operate point is extremely stable over supply voltage and temperature. The ICs consist of a GMR sensor element, CMOS signal processing circuitry to convert the analog sensor element output to a digital output, and optional oscillator and timing circuitry for power management duty cycling. Internally duty cycled versions conserve power. Two different duty-cycle frequencies are available, offering a trade-off between update frequency and power consumption. An integrated latch ensures the output is available continuously. The continuously operating versions have a frequency response of 250 kHz. ADL-Series Digital Switches are ideal for battery-powered devices such as gas and water meters, portable instruments, or anyplace where an extremely low power device is required. The continuously operating versions consume less than a milliwatt, and the duty-cycled versions consume less than a microwatt. The output is current-sinking and can sink up to 100 microamps. Versions of this part with different magnetic characteristics and duty-cycle update frequencies are available. Please contact NVE for details. SB-00-017 February 2012 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 (952) 829-9217 www.nve.com Magnet ADL-Series Nanopower Digital Switches Functional Block Diagrams V DD V Out DD Out Oscillator and Timing Comparator GMR Comparator GMR Latch Sensor Sensor Element Element Duty-cycled versions Continuously-operating versions (ADL0xx/ADL1xx) (ADL9xx) Operation The direction of magnetic field sensitivity is planar to the package. As the field varies in intensity, the digital output will turn on and off. The user must provide a pull-up resistor on the output terminal. Sensor Activation With a Permanent Magnet The diagrams below show two permanent magnet orientations that will activate the sensor in the direction of sensitivity (planar to the package): Magnet NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 (952) 829-9217 www.nve.com