The A1171 is an ultra-sensitive, Hall-effect switch with latched digital outputs and either unipolar or omnipolar actuation. It features operation at low supply currents and voltages, making it ideal for battery-operated electronics. Key features such as lower minimum Vcc, a small, low-profile package, and push-pull complementary outputs, all serve to satisfy present and future trends in battery-operated consumer products.
The low operating supply voltage, 1.65 to 3.5V, and unique clocking algorithm assist in reducing the average operating power consumption. For example, the power requirements are less than 15 µW with a 2.75V supply. Unlike some traditional Hall-effect switches, the A1171 allows the user to configure how the device is magnetically actuated.
Under default conditions, the device will activate output switching with either a north or south polarity magnetic field of sufficient strength. In the EW, 6-pin, microleaded package, the polarity-specific actuation can be set by the user via an external selection pin to operate in a unipolar mode, switching only on a north or south polarity field. Lastly, the A1171 has 2 push-pull output structures, which source and sink current to eliminate the need for external pull-up resistors. This polarity independence, as well as the minimal power requirements, allows the A1171 to easily replace reed switches, providing superior reliability and ease of manufacturing while eliminating the requirement for signal conditioning.
- 1.65 to 3.5V battery operation
- Low supply current
- High sensitivity, BOP typically 30 G (3.0 mT)
- Operation with either the North or South Pole
- Configurable unipolar or omnipolar magnetic sensing
- Complementary, push-pull outputs
- Chopper stabilized
- Superior temperature stability
- Extremely low switch point drift
- Insensitive to physical stress
- Solid state reliability
- Small size
