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AH9251

MEDIUM SENSITIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH


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AH9251 pdf
AH9251
MEDIUM SENSITIVITY MICROPOWER
OMNIPOLAR HALL-EFFECT SWITCH
Description
Pin Assignments
The AH9251 is a medium sensitivity Hall-effect switch with internal
pull-up resistor on the output, designed for battery operated handheld
equipments to industrial applications.
A chopper stabilized architecture improves stability of magnetic switch
points over the whole operating range. A sleep-awake logic controls
the sleep and awake time to reduce the average operating current of
the device. During the awake time, the output is changed with the
magnetic flux density. During the sleep time, the output is latched in
its previous state and the current consumption reduces to 4µA typical
at 3V. The average current consumption is 8µA at 3V.
The output can be switched on with either north or south pole of
sufficient strength. If the magnetic flux density perpendicular to the
part marking surface is larger than operating point (BOP), the output
will be turned on; if it is less than releasing point (BRP), the output will
be turned off.
The AH9251 is available in industry standard TO92S and SC59
packages.
(Front View)
3
2
1
TO92S
(Top View)
GND
3
OUTPUT
GND
VDD
Features
Omnipolar Operation (Switching with North or South Poles)
2.5V to 5.5V Power Supply
Micropower Operation
Built in Pull-up Resistor on the Output
Stabilized Chopper
Superior Temperature Stability
Digital Output Signal
-40°C to +85°C Operating Temperature
ESD (HBM): 5000V
Small Low Profile Industry Standard SC59 and TO92S Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
12
VDD OUTPUT
SC59
Applications
Handheld Wireless Applications Proximity Detection Switches
Doors, Lids, Covers and Tray Position Detect Switches
Liquid Level Detection
Battery Powered Consumer, Home Appliances and Industrial
Applications
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/quality/lead_free.html 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.
AH9251
Document number: DS38218 Rev.1 - 2
1 of 10
www.diodes.com
September 2015
© Diodes Incorporated



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AH9251 pdf
Typical Applications Circuit
AH9251
100pF
21
OUTPUT VDD
AH9251
GND
3
10nF
2.5V to 5.5V
Pin Descriptions
TO92S
1
2
3
Pin Number
SC59
1
3
2
Functional Block Diagram
Sleep/Awake
Control
Pin Name
VDD
GND
OUTPUT
Function
Power supply pin
Ground pin
Output pin
VDD
1(1)
Timing
Logic
Bias
100k
Hall
Plate
A (B)
A for TO92S
B for SC59
+
-
Chopper
Comparator
2(3)
GND
3(2) OUTPUT
AH9251
Document number: DS38218 Rev.1 - 2
2 of 10
www.diodes.com
September 2015
© Diodes Incorporated



Part Number AH9251
Description MEDIUM SENSITIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH
Maker Diodes - Diodes
Total Page 10 Pages
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