AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
Description
Pin Assignments
The AH1892 is a micropower magnetic range selectable (Bop/Brp)
Omnipolar Hall effect switch IC with internal pull up and pull down
capability, designed for consumer equipment ranging from portable
and battery powered cellular phones and portable PCs to home
appliances and industrial applications. To support battery powered
equipment and low voltage microcontrollers, the AH1892 can operate
over the supply range of 1.6V to 3.6V and uses a hibernating clocking
system to minimize the power consumption. The average supply
current is only 4.3µA typical at 1.80V. Due to the application diversity,
the AH1892 has an 8kV ESD rating on the supply and output pins. To
minimize PCB space the AH1892 is packaged in the small CSP
package (0.71mm x 0.71mm) or SOT553 leaded package
U-WLB0707-4
The output is activated with either a north or south pole of sufficient
magnetic field strength. The user can select one of two magnetic
sensitivity bands via the BSEL pin without the addition of any external
components allowing a flexible but small solution. The band select
can be hardwired or be changed on the fly via a logic source such as
a micro-controller. When the magnetic flux density (B) is larger than
operate point (Bop), the output will be turned on (pulled low) and held
until B is lower than release point (Brp).
SOT553
Features
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Omnipolar operation (North or South pole)
Programmable operate and release points
Supply voltage of 1.6V to 3.6V
Micropower operation
Applications
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Open and close detect for gaming and cellular phones
Holster and dock detect for cellular phones
Chopper stabilized design
Cover switch in portable and tablet PCs
Superior temperature stability
Extremely Low Switch-Point Drift
Insensitive to Physical Stress
Digital still and video cameras
Tray, door and covers position detect for printers and scanners
Contact-less switch in consumer and industrial products
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No external pull up resistors required
Good RF noise immunity
-40°C to +85°C operating temperature
8kV ESD on supply and output pins
Miniature U-WLB07070-4 (CSP 0.71mm x 0.71mm typical) and
small low profile SOT553
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Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
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www.diodes.com
May 2012
© Diodes Incorporated
AH1892
Document number: DS35092 Rev. 1 - 2
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