Diodes AH1886 User Manual

AH1886

MICROPOWER, ULTRA-SENSITIVE HALL EFFECT

SWITCH

Description

AH1886 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 output1 on. The output1 will be turned off under no magnetic field. While the magnetic flux density (B) is larger than operate point (Bop), the output1 will be turned on (low), the output1 is held until B is lower than release point (Brp), then turned off.

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

Pin Assignments

( Top View )

Out 2

GND

1 2

NC

Applications

• Cellular phone

• PDA

• Cordless phone

SOT553

5

Out 1

Vdd

43

Typical Application Circuit

AH1886

Document number: DS31216 Rev. 4 - 2

Vdd

AH1886

GND

www.diodes.com

Output 1

Output 2

(Complement

of Output 1)

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MICROPOWER, ULTRA-SENSITIVE HALL EFFECT

Pin Descriptions

Pin Name P/I/O Pin # Description

Out 2 O 1 Output Pin (Complement of Out 1)

GND P/I 2 Ground

NC 3 No Connection

Vdd P/I 4 Power Supply Voltage

Out 1 O 5 Output Pin (active Low)

Functional Block Diagram

Vdd

Power switch

Latch

Hall Plate

Cancelling

Offset

Amp

AH1886

SWITCH

Out1

GND

Hall Plate

Cancelling

Logical

Offset

Amp

Latch

Absolute Maximum Ratings (T

= 25°C)

A

Symbol Characteristics Values Unit

Vdd Supply voltage 5 V

B Magnetic flux density Unlimited TS Storage Temperature Range -65 to +150 °C PD Package Power Dissipation 230 mW TJ Maximum Junction Temperature 150 °C

Recommended Operating Conditions (T

= 25°C)

A

Symbol Parameter Conditions Rating Unit

Vdd Supply Voltage Operating 1.65 to 3.3 V

TA Operating Temperature Range Operating -40 to +85

Vdd

Out2

GND

°C

AH1886

Document number: DS31216 Rev. 4 - 2

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AH1886

MICROPOWER, ULTRA-SENSITIVE HALL EFFECT

SWITCH

Electrical Characteristics (TA = 25°C, Vdd = 1.8V, unless otherwise specified)

Symbol Characteristic Conditions Min Typ. Max Unit

VOH Output On Voltage (High side) IO= -0.5mA Vdd-0.2 - - V

VOL Output On Voltage (Low side) IO= 0.5mA - - 0.2 V Idd(en) Idd(dis) Chip disable - 5 8 uA

Idd(avg) average supply current - 7 12 uA

Tawake Awake Time - 50 100 µs Tperiod Period - 50 100 ms

D.C. Duty Cycle - 0.1 - %

Supply Current

Chip enable - 2 4 mA

Magnetic Characteristics (T

Symbol Characteristic Min Typ. Max Unit

Bops(south pole to brand side) Bopn(north pole to brand side) -55 -37 Brps(south pole to brand side) Brpn(north pole to brand side) - -29 -6 Bhy(|Bopx|-|Brpx|) Hysteresis 3 8 -

Notes: 1. Typical data is at Ta = 25°C, Vdd = 3V, and for design information only.

2. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.

= 25°C, Vdd = 1.8V~3.0V, Note 1 & 2)

A

Operate Point

Release Point

- 37 55

6 29 -

(1mT=10 Gauss)

Gauss

)

Voltage

Output (

Turn on

V

dd

Output1

( off-state )

hy

B

Turn off

)

Voltage

Turn off

Output (

Output1

( off-state )

B

hy

dd

V

Turn on

( on-state )

opn

B

( Magnetic flux density B )

AH1886

Document number: DS31216 Rev. 4 - 2

B

rpn

sat

V

0

V

rps

B

0

( Magnetic flux density B )

( on-state )

ops

B

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