General Description
Using BiCMOS process, the AS1794 is designed for high performance unipolar detection hall-effect application, such as 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 24V.
AS1794 is designed to respond to alternating North or 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 ， SSOT23-3L, SOT23-3L and SOT89-3L Packages 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 24V
● Resistant to physical stress
● Unipolar Latch Operation
● High Sensitivity Hall Sensor
● High Chopping Frequency
● Magnetic Sensitivity (typical)BOP=70Gauss, BRP=55Gauss
● Need Pull-up Resistance
● Over Voltage Protection: 30V
● Small Solution Size
● RoHS Compliant
● SIP-3L SSOT23-3L, SOT23-3L and SOT89-3L Packages
● -40℃ to +150 ℃ Temperature Range
Applications
● Electric Tools
● Automotive, Home appliances, Industrial
● Rotor Position Sensing and Flow Meters● Brushless DC Motor/Fan
● Speed Measurement
● Revolution Counting
● Valve and Solenoid Status
● Proximity Sensing● Tachometers
● Magnetic Encoder
