Diodes AH9249 User Manual

High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9249

Data Sheet

General Description

The AH9249 is an ultra-sensitive Hall-effect switch with digital latched output, mainly designed for battery-operation, hand-held equi pments.

Special CMOS process is used for low-voltage and low-power requirement. A chopper stabilized amplifier improves stability of magnetic switch points. A sleep-awake logic controls the IC in sleep time or awake time. This function will reduce the average operating current of the IC. During the awake time, the output is changed with the magnetic flux density. During the sleep time, the output is latched in its previous state and the current consumption will reduce to some μA.

The IC switching behaviour is omnipolar, either north or south pole sufficient strength will turn the output on. If the magnetic flux density is larger than operating point(B it is less than releasing point(B turned off.

The AH9249 is available in TO-92S-3, SOT-23-3 and DFN-2×2-3 packages which are optimized for most applications.

), the output will be turned on; if

OP

), the output will be

RP

Features

Micropower Operation

•

• 2.5 to 5.5V Power Supply

• Switching for Both Poles of a Magnet (Omnipolar)

• Stabilized Chopper

• Superior Temperature Stability

• Digital Output Signal

• Built-in Pull-up Resistor

• ESD Rating: 4000V (Human Body Model)

600V (Machine Model)

Applications

• Cover Switch in Notebook PC/PDA

• Handheld Wireless Application Awake Switch

• Magnet Switch in Low Duty Cycle Applications

TO-92S-3 SOT-23-3 DFN-2×2-3

Figure 1. Package Types of AH9249

Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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Data Sheet

High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9249

Pin Configuration

Z3 Package N Package

(TO-92S-3) (SOT-23-3)

3 2 1

(Front View) (Top View)

OUTPUT

GND VCC

GND

3

DN Package

(DFN-2×2-3)

Pin 1 Dot

by Marking

1

GND

3

2

VCC

OUTPUT

Figure 2. Pin Configuration of AH9249

2

1

OUTPUT

VCC

Pin Description

Pin Number

TO-92S-3 SOT-23-3

DFN-2×2-3

1 1 1 VCC Power supply pin 2 3 3 GND Ground pin 3 2 2 OUTPUT Output pin

Pin Name Function

Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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T

Data Sheet

High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9249

Functional Block Diagram

VCC

1 (1)

A (B)

A for TO-92S-3

B for SO

Sleep/Awake

Control

Hall

Plate

Chopper Comparator

-23-3 and DFN-2×2-3

Timing

Logic

Bias

3 (2)

OUTPUT

2 (3)

GND

Figure 3. Functional Block Diagram of AH9249

Ordering Information

AH9249 -

Circuit Type

Package Z3: TO-92S-3 N: SOT-23-3 DN: DFN-2×2-3

Package Temperature Range Part Number Marking ID Packing Type

G1: Green

Blank: Bulk TR: Tape and Reel

TO-92S-3 AH9249Z3-G1 9249 Bulk SOT-23-3 AH9249NTR-G1 GJ9 Tape & Reel

DFN-2×2-3

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.

Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

-40 to 85°C AH9249DNTR-G1 JB Tape & Reel

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Data Sheet

High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9249

Absolute Maximum Ratings (TA=25°C, Note 1)

Parameter Symbol Value Unit

Supply Voltage VCC 7 V Supply Current (Fault) ICC 6 mA Output Voltage V Output Current I Magnetic Flux Density B Unlimited Gauss

Power Dissipation PD

Storage T empera ture T Junction Temperature TJ 150 ESD (Human Body Model) (Note 2) 4000 ESD (Machine Model) (Note 2) 600

7 V

OUT

2 mA

OUT

TO-92S-3 400 SOT-23-3 230

DFN-2×2-3 230

-55 to 150

STG

mW

°C

V

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Note 2: Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products.

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Supply Voltage VCC 2.5 5.5 V Operating T emperat ure TOP -40 85

°C

Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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Data Sheet

High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9249

Electrical Characteristics

V

=3V, TA =25°C, unless otherwise specified.

CC

Parameter Symbol Conditions Min Typ Max Unit

Supply Voltage VCC Operating 2.5 3 5.5 V

IAW Awake 2 4 mA

Supply Current

Output Current I Output Leakage Current I Saturation Voltage V Awake Mode Time tAW Operating 150 Sleep Mode Time tSL Operating 90 120 ms Duty Cycle D 0.15 % Chopper Frequency fC 15 kHz

ISL Sleep 6 10

I

Average 10 15

AVG

1.0 mA

OUT

LEAK

I

SAT

B<︱B

OUT

︱

RP

=1.0mA 0.4 V

<0.1 1

μA μA

μA

μs

Magnetic Characteristics (Note 3)

V

=3V, TA=25°C, unless otherwise specified.

CC

Parameter Symbol Conditions Min Typ Max Unit

Operating Point

Releasing Point

Hysteresis B

B

OPS

B

OPN

B

RPS

B

RPN

HYS

South pole to branded side B>B

OPS,VOUT

North pole to branded side B>B

OPN,VOUT

South pole to branded side B<B

RPS,VOUT

North pole to branded side B<B

RPN,VOUT

︱B

- B

OPX

RPX

=low (output on)

=high (output off)

︱(Note 4)

30 55 Gauss

-55 -30 Gauss

5 20 Gauss

-20 -5 Gauss 10 Gauss

Note 3: The specifications stated here are guaranteed by design. 1 Gauss=0.1Mt. Note 4: B

=operating point (output turns on); B

OPX

=releasing point (output turned off).

RPX

Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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