AH1902 Hall-Effect Switch Family

AH1902 Hall-Effect Switch Family

Diodes' AH1902 is a high sensitivity micropower Omnipolar Hall-effect switch IC with internal pull-up and pull-down capability. Designed for portable and battery-powered consumer equipment such as cellular phones and portable PCs to office equipment, home appliances and industrial applications, the average supply current is only 4.3 µA at 1.8 V. To support portable equipment the AH1902 can operate over the supply range of 1.6 V to 3.6 V and uses a hibernating clocking system to minimize the power consumption. To minimize PCB space the AH1902 is available in small, low-profile X1-DFN1216-4 and X2-DFN2015-6 packages.

The single output is activated with either a north or south pole of sufficient magnetic field strength. When the magnetic flux density (B) perpendicular to the package is larger than operate point (Bop), the output will be turned on (pulled low) and held until B is lower than release point (Brp). The output will remain off when there is no magnetic field.

  • Omnipolar operation (north or south pole)
  • Supply voltage of 1.6 V or 3.6 V
  • High sensitivity
  • Chopper-stabilized design provides
    • Superior temperature stability
    • Minimal switch-point drift
    • Enhanced immunity to physical stress
  • Micropower operation
  • No external pull-up resistors required
  • Good RF noise immunity
  • -40°C to +85°C operating temperature
  • High ESD capability of 8 kV (human body model)
  • Small, low-profile X1-DFN1216-4 and X2-DFN2015-6 packages
  • Open and close detect for flip / slide cellular phones
  • Smart cover or dock detect for cellular phones, tablet PCs and e-readers
  • Cover or display switch in portable PCs (Ultrabooks)
  • Digital still, video cameras and handheld gaming consoles
  • Door, lids, and try position switches
  • Level, proximity, and position switches
  • Contact-less switches in home appliances and industrial applications