General Description
Using BiCMOS process, the AS1878 is designed for high performance Omnipolar detection hall-effect application, such as automotive, industrial, electric tools, home appliances, rotor position sensing, brushless DC motor etc. The hall IC integrated an on-chip hall voltage generator for magnetic sensing, a comparator that amplifiers the hall voltage, hall sensor with dynamic offset cancellation system, an pull-up resistance, and a Schmitt trigger to provide switching hysteresis for noise rejection, and a voltage regulator for operation with supply voltage of 2.8V to 40V.
AS1878 is designed to respond to alternating North and South poles. White the magnetic flux density (B) is larger than operate point (BOP), the output will be turned on (low), the output is held until the magnetic flux density (B) is lower than release point (BRP), then turn off (high).
The device is available in SIP-3L and SOT23-3L Package and is rated over the -40°C to 150°C. the package is RoHS compliant.
Features
High Performance BiCMOS Process Tech.
Input Voltage Range : 2.8V to 40V
Resistant to physical stress
Omnipolar Operation
High Sensitivity Hall Sensor
High Chopping Frequency
Magnetic Sensitivity (typical)BOP=±110Gauss, BRP=±80Gauss
Small Solution Size
RoHS Compliant
SIP-3L and SOT23-3L Packages -40℃ to +150 ℃ Temperature Range
Applications
● Docking Detection
● Door Open and Close Detection
● Valve Positioning
● Pulse Counting
● Electric Tools
● Rotor Position Sensing and Flow Meters
● Valve and Solenoid Status
● Proximity Sensing
● Tachometers
● Magnetic Encoder
