AH1894-FA-7

The AH1894 is a high sensitivity micropower magnetic range selectable Omni polar Hall effect switch IC with internal pull up and pull down capability. Designed for portable and battery powered equipment such as cellular phones and portable PCs to home appliances and industrial applications, the average power consumption is only 8uW at 1.85V. To support portable equipment the AH1894 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 AH1894 is available in small low profile X1-DFN1216-4 and SOT553 packages.The output is activated with either a north or south pole of sufficient magnetic field strength. The user can select one of two magnetic sensitivity bands via the BSEL pin without the addition of any external components allowing a flexible but small solution. The band select can be hardwired or be changed on the fly via a logic source such as a micro-controller. When the magnetic flux density (B) is larger than operate point (Bop), the output will be turned on (pulled low) and held until B is lower than release point (Brp).

• Omnipolar Operation (North or South pole)
• Programmable Operate and Release Points
• Supply Voltage of 1.6V to 3.6V
• Micropower Operation
• Chopper Stabilized Design Provides:
  • Superior Temperature Stability
  • Minimal Switch Point Drift
  • Enhanced Immunity to Physical Stress
• No External Pull-up Resistors Required
• Good RF Noise Immunity
• -40°C to +85°C Operating Temperature
• High ESD capability of 8kV (Human Body Model) on V DD , GND and OUTPUT Pins
• Small Low Profile X1-DFN1216-4 and SOT553 Packages
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. “Green” Device