Description
The AH1812 is a high sensitivity micropower Omnipolar Hall effect switch IC with an open drain output. Designed for portable and battery powered equipment such as cellular phones and portable PCs, the average supply current is only 4.3µA at 1.85V. To support potable equipment the AH1812 can operate over the supply range of 1.6V to 3.6V and uses a hibernating clocking system to minimize the power consumption. To minimize PCB space the AH1812 is available in small low profile X1-DFN1216-4 package

Features
 • Omnipolar Operation (North or South Pole)
 • Supply Voltage of 1.6V to 3.6V
 • High Sensitivity
 • Micropower Operation
 • Chopper Stabilized Design Provides:
    ◾ Superior Temperature Stability
    ◾ Extremely Low Switch-Point Drift
    ◾ Enhanced Immunity to Stress
 • Open Drain Output for System Flexibility
 • Good RF Noise Immunity
 • -40°C to +85°C Operating Temperature
 • Small and Low Profile X1-DFN1216-4 Package
 • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 • Halogen and Antimony Free. “Green” Device (Note 3)

Applications
 • Cover or Display Switch in Portable PCs
 • Open and Close Detect for Cellular Phones
 • Holster Detect for Cellular Phones and Tablet PCs
 • Digital Still and Video Cameras
 • Contact-Less Switches