General Description

Using low power CMOS process, the AS1811 is
designed for low power, high performance unipolar
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. The total power consumption of AS1811 is
typically less than 2uA at 1.8V power supply. AS1811
is designed to respond to alternating North pole. When
the magnetic flux density (B) is larger than operate
point (BOPN), the output will be turned on (low), the
output is held until the magnetic flux density (B) is
lower than release point (BRPN), then turn off (high). The device is available in SOT553 DFN1216-4L
and TSOT23-3L Package and is rated over the -40°C
to 85°C. The package is RoHS and Green compliant.

Features

 Input Voltage Range : 1.65V to 3.65V
 Micro-power consumption ideal for battery
power applications
 Uniplar Operation, easy to use as output
 Very high sensitivity hall sensor
 Low Power CMOS process technology
 Chopper stabilization amplifier stage
 Magnetic Sensitivity (typical)
BOPN=-30Gauss, BRPN=-23Gauss
 Good RF noise immunity
 No need pull-up resistor
 Small Solution Size
 RoHS & Green Compliant
 Small SOT553 DFN1216-4L and TSOT23-3L
Package
 -40℃ to +85 ℃ Temperature Range

Applications

 Cover switch in clam-shell cellular phones
 Cover switch in Notebook, PC/PAD
 Contact-less switch in consumer products
 Solid State Switch
 Handheld Wireless Handset Awake Switch
 Lid close sensor for battery-powered devise
 Magnet proximity sensor for reed switch
replacement in low duty cycle applications
 DV, DSC, and White Goods