Diodes AH1801 User Manual
AH1801
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT
SWITCH
Features
• Micropower operation
• Operation with North or South Pole
• 2.5V to 5.5V battery operation
• Inverted Output-on withou t Magn et pre s en t
• Chopper stabilized
• Superior temperature stability
• Extremely Low Switch-Point Drift
• Insensitive to Physical Stress
• Good RF noise immunity
• -40°C to 85°C operating temperature
• Low profile 3 pin SC59 (commonly known as SOT23 in
Asia) and DFN2020-3, DFN2020-6 package
• ESD (HBM) ＞ 5KV for DFN2020-3 and DFN2020-6
＞ 6KV for SC59
• SC59, DFN2020-3 and DFN2020-6: Available in
“Green” Molding Compound (No Br, Sb)
• Lead Free Finish / RoHS Compliant (Note 1)
Applications
• Cellular phone
• PDA
• Cordless phone
Ordering Information
AH1801 - XX G - 7
General Description
AH1801 is a Micropower, Ultra-sensitive Hall Effect Switch , which
is with two Hall e ff ec t plates and a output dr iver, mainly desi gn ed
for battery–operation, hand-held equipment (such a s C ellula r and
Cordless Phone, PDA). The total operation power is down to
24uW in the 3V supply.
Either north or south pole of sufficient strength will turn the output
off. The output will be turned on under no magnetic field.
While the magnetic flux density (B) is larger than operate point
(Bop), the output will be turned off, the output is held until B is
lower than release point (Brp), then turned on.
Package
W : SC59
Green
G : Green
Packing
7 : Tape & Reel
FJ : DFN2020-3
SN : DFN2020-6
Device
Package
Code
Packaging
(Note 2)
Quantity Part Number Suffix
AH1801-WG-7 W SC59 3000/Tape & Reel -7
AH1801-FJG-7 FJ DFN2020-3 3000/Tape & Reel -7
AH1801-SNG-7 SN DFN2020-6 3000/Tape & Reel -7
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf
.
.
AH1801 Rev. 7 1 of 10 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
7” Tape and Reel
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT
Pin Assignment
(1) SC59 (2) DFN2020-3
( Top View )
2. Output
GND 3.
1. Vdd
AH1801
SWITCH
( Top View )
3. GND
(3) DFN2020-6
( Top View )
5. GND
1. Vdd 2. NC 3. Output
Notes: 3. NC is “No Connection”, which is recommended to be tied to ground.
4. NC6. NC
Pin Descriptions
Pin Name P/I/O Description
Vdd P/I Power Supply Input
GND P/I Ground
Output O Output Pin
NC No Connected
1. Vdd
3. Output
AH1801 Rev. 7 2 of 10 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Block Diagram
Hall Plate
Cancelling
AH1801
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT
SWITCH
Vdd
1
Power
switch
Offset
Amp
Latch
Output
3
Hall Plate
Typical Circuit
Cancelling
Logical
GND
2
Offset
Amp
2.5~5.5V
C
AH1801
GND
Latch
Output
R
L
Notes: 4. C is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF~100nF.
R
is the pull-up resistor, the recommended resistance is 10KΩ~100KΩ.
L
AH1801 Rev. 7 3 of 10 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
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