General Description

Using CMOS process, the AS1894AOD is
designed for high performance omnipolar detection
hall-effect application, such as cover switch, contactless switch, solid state switch and lid close
sensor etc battery operation. The hall IC integrated an
on-chip hall voltage generator for magnetic sensing, a
comparator that amplifiers the hall voltage, a Chopper
amplifier, a Schmitt trigger to provide switching
hysteresis for noise rejection, and a complementary
output. AS1894AOD is designed to respond to alternating
North and South poles. When 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 SOT23-3L & SIP-3L
Package and is rated over the -40°C to 125°C. The all
packages are RoHS and Green compliant.

Features

 Input Voltage Range : 2.5V to 5.5V
 Micro-power consumption ideal for battery
power applications
 Omnipolar Operation, easy to use as output
 Very high sensitivity hall sensor
 CMOS process technology
 Chopper stabilization amplifier stage
 Magnetic Sensitivity (typical)
BOP=±32Gauss, BRP=±28Gauss
 Good RF noise immunity
 OD Output (need pull-up resistor)
 Small Solution Size
 RoHS & Green Compliant
 SOT23-3L & SIP-3L Packages
 -40℃ to +125 ℃ Temperature Range

Applications

 Smart Meter
 Cover switch
 Contact-less switch