Diodes AH1802 User Manual
Ah1802, Description, Pin assignments
AH1802
MICROPOWER, ULTRA-SENSITIVE OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1802
Document number: 31170 Rev. 8 - 2
1 of 11
December 2010
© Diodes Incorporated
Description
The AH1802 is a ultra-sensitivity, micropower Omnipolar Hall
Effect switch IC designed for portable and battery powered
equipment such as cellular phones, PDA’s and portable
PC’s. Based on two sensitive Hall Effect plates and
a
chopper stabilized architecture the AH1802 provides
a reliable solution over the whole operating range. To support
portable and battery powered equipment the design has been
optimized to operate over the supply range of 2.5V to 5.5V
and consumes only 24uW with a supply of 3V.
The single open drain output can switched on with either a
north or south pole of sufficient strength. When the magnetic
flux density (B) is larger than operate point (Bop) the output is
switched on (pulled low). The output is turned off when
B becomes lower than the release point (Brp). The output will
remain off when there is no magnetic field.
Pin Assignments
1. Vdd
GND 3.
2. Output
(Top View)
SC59
1. Vdd
2. NC
3. Output
4. NC
6. NC
5. GND
(Top View)
DFN2020-6
1. Vdd
3. Output
3. GND
(Top View)
DFN2020-3
1. Vdd
2. Output
3. GND
(Top View)
DFN2015H4-3
Features
• Omni-polar (north or south pole) operation
• High
sensitivity
• Single open drain output
• Micropower
operation
• 2.5V to 5.5V operating range
• Chopper stabilized design provides
•
Superior temperature stability
•
Minimal switch point drift
•
Enhanced immunity to stress
• Good RF noise immunity
• -40
°C to 85°C operating temperature
• ESD＞5kV for DFN2020-6, DFN2020-3 and
DFN2015H4-3
ESD＞6kV for SC59
• Low profile SC59, DFN2020-6, DFN2020-3 and
DFN2015H4-3 packages
• “Green” Molding Compound (Note 1)
Applications
• Cover switch in clam-shell or slide type cellular phones
• Display switch for portable PCs
• On/Off switch for PDAs and digital cameras
• Contact-less switch in consumer products
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at