AH1898-CA4-7

AH1898-CA4-7 is a micropower magnetic range selectable (Bop/Brp) omnipolar hall-effect switch IC with internal pull-up and pull-down capability. 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 pin can be hardwired or changed on the fly via a logic source such as a microcontroller. Applications include open and close detection for cellular phones, holster or cover detection for cellular phones and tablet PCs, cover or display switch in portable PCs, digital stills, video cameras and handheld gaming consoles, proximity and position switches.

• Programmable operate and release points
• Supply voltage of 1.6V to 3.6V
• Micropower operation
• Chopper stabilized design, superior temperature stability
• Minimal switch point drift, enhanced immunity to stress
• No external pull-up resistors required
• Good RF noise immunity, 8kV human body model ESD capability
• Average supply current is 4.3µA typ at TA = +25°C, VDD = 1.8V
• U-WLB0808-4 (type A1) package
• Operating temperature range from -40 to +85°C