AH1802

MICROPOWER, ULTRA-SENSITIVE OMNIPOLAR

HALL-EFFECT SENSOR SWITCH

AH1802

Document number: 31170 Rev. 8 - 2

1 of 11

www.diodes.com

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

http://www.diodes.com/products/lead_free.html.