General Description

Using CMOS process, the AS1804C 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. AS1804C 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 and SIP-3L
Packages and is rated over the -40°C to 125°C. The all
packages are RoHS and Green compliant.

Features

 Input Voltage Range : 1.7V 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=±40Gauss, BRP=±20Gauss
 Good RF noise immunity
 No need pull-up resistor
 Small Solution Size
 RoHS & Green Compliant
 SOT23-3L and SIP-3L Packages
 -40℃ to +125 ℃ Temperature Range

Applications

 Cover switch
 Contact-less switch
 Solid State Switch
 Magnet proximity sensor for reed switch
replacement in low duty cycle applications
 DV, DSC, and White Goods
 Smart Meter