MLX90248ESO datasheet, PDF - EEWORLD Datasheet

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MLX90248ESO: DescriptionMAGNETIC SWITCH OMNIPOLAR SOT23; CategoryThe sensor; File Size421KB，11 Pages; ManufacturerMelexis Technologies NV; Environmental Compliance

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MLX90248ESO Overview

MAGNETIC SWITCH OMNIPOLAR SOT23

MLX90248ESO Parametric

Parameter Name	Attribute value
Function	Omnipolar switch
technology	Hall Effect
polarization	any kind
Sensing range	±6mT trip, ±0.8mT release
Test Conditions	25°C
Voltage - Power	1.5 V ~ 3.6 V
Current - Power (maximum)	10µA
Current - Output (maximum)	10mA
Output type	open drain
characteristic	-
Operating temperature	-40°C ~ 85°C（TA）
Package/casing	TO-236-3，SC-59，SOT-23-3
Supplier device packaging	SOT-23

MLX90248ESO Preview

MLX90248

Micropower & Omnipolar

™

Hall Switch

Features and Benefits

Micropower consumption ideal

for battery-powered applications

Omnipolar, easy to use as output switches

with both North and South pole

Very High Sensitivity Hall Sensor

Chopper stabilized amplifier stage

Open-Drain Output

Operation down to 1.5V

Ultra-Thin QFN package (0.43mm max) &

Thin SOT23 3L (both RoHS Compliant)

Application Examples

Solid State Switch

Handheld Wireless Handset Awake Switch

Lid close sensor for battery-powered devices

Magnet proximity sensor for reed switch

replacement in low duty cycle applications

Ordering Information

Part No.

MLX90248

Temperature Code

E (-40° to 85°

Package Code

SE (TSOT-3L)

LD (UTQFN-6L)

1 Functional Diagram

2 General Description

The MLX90248 Omnipolar Hall effect sensor IC

is fabricated from mixed signal CMOS technology.

It incorporates advanced chopper-stabilization

techniques to provide accurate and stable

magnetic switch points.

The circuit design provides an internally controlled

clocking mechanism to cycle power to the Hall

element and analog signal processing circuits.

This serves to place the high current-consuming

portions of the circuit into a “Sleep” mode.

Periodically the device is “Awakened” by this

internal logic and the magnetic flux from the Hall

element is evaluated against the predefined

thresholds. If the flux density is above or below the

Bop/Brp thresholds then the output transistor is

driven to change states accordingly. While in the

“Sleep” cycle the output transistor is latched in its

previous state. The design has been optimized for

service in applications requiring extended

operating lifetime in battery powered systems.

The output transistor of the 90248 will be latched

on (BOP) in the presence of a sufficiently strong

South or North magnetic field facing the marked

side of the package. The output will be latched off

(BRP) in the absence of a magnetic field.

390109024802

Rev 001

Page 1 of 11

Data Sheet

Jan/09

MLX90248

Micropower & Omnipolar

™

Hall Switch

Table of Contents

1 Functional Diagram ........................................................................................................ 1

2 General Description........................................................................................................ 1

3 Glossary of Terms .......................................................................................................... 3

4 Absolute Maximum Ratings........................................................................................... 3

5 Pin Definitions and Descriptions................................................................................... 3

6 General Electrical Specifications .................................................................................. 4

7 Magnetic Specifications ................................................................................................. 4

8 Outputs Behaviour vs. Magnetic Pole........................................................................... 4

9 Detailed General Description......................................................................................... 5

10 Unique Features............................................................................................................ 5

11 Performance Graphs .................................................................................................... 6

11.1 Magnetic Thresholds vs. T

.................................................................................................................... 6

11.2 Magnetic Thresholds vs. V

.................................................................................................................. 6

11.3 Current Consumption vs. T

................................................................................................................... 6

11.4 Current Consumption vs. V

................................................................................................................. 6

11.5 Consumption Period vs. T

..................................................................................................................... 6

11.6 Consumption Period vs. V

................................................................................................................... 6

11.7 Output Saturation Voltage vs. T

............................................................................................................ 7

11.8 Output Switching Characteristics ............................................................................................................ 7

12 Application Information................................................................................................ 7

13 Standard information regarding manufacturability of Melexis products with

different soldering processes........................................................................................... 8

14 ESD Precautions ........................................................................................................... 8

15 Package Information..................................................................................................... 9

15.1 SE Package (TSOT-3L) .......................................................................................................................... 9

15.2 LD Package (UTQFN-6L) ..................................................................................................................... 10

16 Disclaimer.................................................................................................................... 11

390109024802

Rev 001

Page 2 of 11

Data Sheet

Jan/09

MLX90248

Micropower & Omnipolar

™

Hall Switch

3 Glossary of Terms

Gauss, milliTesla (mT),

Units of magnetic flux density :

10 Gauss = 1mT

4 Absolute Maximum Ratings

Parameter

Symbol

Supply Voltage

Supply Current

Output Voltage

OUT

Output Current

OUT

Operating Temperature Range

Storage Temperature Range

ESD Sensitivity - HBM

(1)

ESD Sensitivity - MM

(2)

Table 1: Absolute maximum ratings

Value

-40 to 85

-50 to 150

8000

800

Units

°C

Note 1:

Human Body Model according JESD22-A114 standard – 100pF capacitor discharged through 1.5k

Ω

resistor into each pin.

Note 2:

Machine Model according JESD22-A115 standard – 200pF capacitor discharged directly (0

Ω

resistor) into each pin.

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-

rated conditions for extended periods may affect device reliability.

5 Pin Definitions and Descriptions

SE Package

Pin Name

Function

№

(SE)

VDD

Power Supply

GND

Ground

OUT

Output (Open Drain)

Not Connected

Table 2: Pin definitions and descriptions

Note :

Exposed Pad on LD package is connected to ground

LD Package

№

(LD)

1,3,6

390109024802

Rev 001

Page 3 of 11

Data Sheet

Jan/09

MLX90248

Micropower & Omnipolar

™

Hall Switch

6 General Electrical Specifications

DC Operating Parameters T

= 25 C, V

= 1.5V to 3.6V (unless otherwise specified)

Parameter

Supply Voltage

Awake Supply Current

Sleep Supply Current

Average Supply Current

Output Saturation Voltage

Output Leakage Current

Awake Period

Sleep Period

Symbol

DDawake

DDsleep

DDav

SAT

LEAK

Test Conditions

Operating

= 3.6V

= 3.6V, Average

OUT

= 1mA

= 3.6V

Operating

Min

1.5

Typ

3.5

6.5

0.27

Max

3.6

0.4

120

Units

µA

µs

Table 3: Electrical specifications

7 Magnetic Specifications

DC Operating Parameters T

= 25 C, V

= 1.5V to 3.6V (unless otherwise specified)

Parameter

Symbol

Operating Point

Release Point

Hysteresis

HYST

Table 4: Magnetic specifications

Min

+/-1.1

+/-0.8

0.3

Typ

Max

+/-6

+/-5.7

2.3

Units

Note :

For typical values, please refer to the performance graphs section

8 Outputs Behaviour vs. Magnetic Pole

SE Package

Parameter

Test conditions

OUT (SE)

North or South pole

B > |B

Low

“Zero” magnetic pole

B < |B

High

Table 5: Outputs behaviour vs. magnetic pole

OUT (LD)

Low

High

LD Package

Note :

The magnetic pole is applied facing the branded side of the package

390109024802

Rev 001

Page 4 of 11

Data Sheet

Jan/09

MLX90248

Micropower & Omnipolar

™

Hall Switch

9 Detailed General Description

The MLX90248 is originally used in mobile phone applications for open/close lid detection (flip, slide and

swivel phone type). The goal of this detection is to switch on or off the application if the lid is opened or

closed, in order to save battery power.

The same operation principle can be simply applied to any other battery-powered device with a lid/cover like

laptop, digital cameras and camcorders.

By the use of a very high sensitivity Hall sensor, a very small and cheap magnet is enough to trigger the

MLX90248, hence it can easily replace reed switch.

The major benefit of using a Hall sensor is to provide “electronic” commutation, which is bounce-free, more

reliable and with increased lifetime compared to usual mechanical contacts.

10 Unique Features

The MLX90248 exhibits “Omnipolar” magnetic characteristics. It means the device reacts to both North and

South magnetic pole. The purpose is to detect the presence of any magnetic field applied on the device.

This mode of operation simplifies customer production processes by avoiding the need to detect the Hall

sensor pole active on the magnet used in the application.

Taking the example of a generic Hall sensor “south pole active”, during its production, the customer must

detect the south pole of the application magnet and face it to the device to enable the output to be turned on

and off. Without any magnet pole detection system, the incorrect magnetic pole (north in this example) could

be faced to the device which would fail the application.

Therefore, the “Omnipolar” magnetic behaviour helps customers by removing the need of magnet pole

detection system during production phase.

The “Micropower” feature makes the MLX90248 especially suitable for battery-powered device as it

combines low voltage operation and low current consumption. By using a sleep/awake strategy managed

internally, the power consumption is drastically reduced. To make a comparison, the MLX90248 consumes

100 times less power than the generic low voltage Melexis Hall sensor US3881.

As well as Thin SOT package, the MLX90248 is now delivered in an ultra thin UTQFN package. This new

leadless package only requires 3mm PCB surface and is 0.43mm maximum thick, which is particularly

important in design where space-saving and miniaturisation are the critical factors.

390109024802

Rev 001

Page 5 of 11

Data Sheet

Jan/09

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