AH1887

MICROPOWER, ULTRA-SENSITIVE HALL EFFECT

SWITCH

AH1887

Document number: DS31313 Rev. 4 - 2

1 of 7

www.diodes.com

August 2010

© Diodes Incorporated

Description

AH1887 is with two Hall effect plates and dual CMOS output

driver, mainly designed for battery–powered, hand-held

equipment (such as Cellular and Cordless Phone, PDA). The

total operation power is down to 15uW in the 1.8V supply.

Either north or south pole of sufficient strength will turn the

output on. The output will be turned off under no magnetic

field.

While the magnetic flux density (B) is larger than operate

point Bop(s), the output1 will be turned on (low), the output is

held until B is lower than release point Brp(s), then turned off

(high).

While the magnetic flux density (B) is larger than operate

point Bop(n), the output2 will be turned on (low), the output is

held until B is lower than release point Brp(n), then turned off

(high).

Pin Assignments

5

4

3

2

1

SOT553

GND

Out 1

NC

Out 2

Vdd

( Top View )

Features

•

Micropower operation

•

Operation with North or South Pole

•

1.65V to 3.3V battery operation

•

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

•

ESD ＞ 4KV in human body mode

•

Package: SOT553

•

“Green” Molding Compound

Applications

•

Cellular phone

•

PDA

•

Cordless phone

Typical Application Circuit

AH1887

Vdd

Output 1

GND

Output 2