AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR 
HALL-EFFECT SENSOR SWITCH
 
AH1892 
Document number: DS35092  Rev. 1 - 2 
1 of 11 
www.diodes.com  
May 2012 
?Diodes Incorporated 
Description 
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 4.3礎(chǔ) 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  
 
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). 
 
Features 
"    Omnipolar operation (North or South pole) 
"    Programmable operate and release points  
"    Supply voltage of 1.6V to 3.6V 
"    Micropower operation 
"    Chopper stabilized design 
     Superior temperature stability 
     Extremely Low Switch-Point Drift 
     Insensitive to Physical Stress 
"    No external pull up resistors required 
"    Good RF noise immunity 
"    -40癈 to +85癈 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 
"    Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) 
"    Halogen and Antimony Free. Green Device (Note 3) 
Pin Assignments 
 
 
U-WLB0707-4 
 
 
SOT553 
 
 
Applications 
"    Open and close detect for gaming and cellular phones 
"    Holster and dock detect for cellular phones  
"    Cover switch in portable and tablet PCs  
"    Digital still and video cameras 
"    Tray, door and covers position detect for printers and scanners
"    Contact-less switch in consumer and industrial products 
 
 
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 Incorporateds 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.