ADL924-14E - NVE CORPORATION - Datasheet.Directory

ADLxxx Nanopower Digital Switches

NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 www.nve.com ©NVE Corporation

ADLxxx Nanopower Digital Switches

Functional Diagrams

GMR

Sensor

Element

Out

Comparator

GND

ADL9xx

(continuous duty)

GMR

Sensor

Element

Latch

Out

VDD

Oscillator

andTiming

GND

Comparator

ADL0xx

(duty-cycled)

Idealized Magnetic Response

Features

• 2.4 V − 3.6 V operating voltage

• Continuously operating or duty-cycled versions

• Power as low as 150 nW at 2.4 V

• Operate points as low as 20 Oe

• Precise detection of low magnetic fields

• Ultraminiature 1.1 x 1.1 mm package

Applications

• Portable instruments

• Utility meters

• Lithium cell powered applications

Description

ADLxxx-Series sensors are Giant Magnetoresistive (GMR)

Digital Switch devices designed to operate from

3.3-volt power supplies or single lithium cells with

extremely supply low currents. The devices are

manufactured with NVE’s patented spintronic GMR

technology and low-power CMOS circuitry for unmatched

miniaturization, sensitivity, precision, and low power.

The output is configured as a magnetic “switch” where the

output turns on when the magnetic field is applied, and turns

off when the field is removed. Versions are available that are

either continuous duty or internally duty cycled operation to

further reduce power consumption. An integrated latch

ensures the output is available continuously in duty-cycled

versions.

The applied field can be of either polarity, and the operate

point is extremely stable over supply voltage and

temperature. The output is current-sinking, and can sink up

to 100 microamps.

ADLxxx Nanopower Digital Switches

NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 www.nve.com ©NVE Corporation

Absolute Maximum Ratings

Parameter Min. Max. Units

Supply voltage 5.5 Volts

Output voltage 5.5 Volts

Output current 200

Storage temperature −65 135 °C

Junction temperature 135 °C

Applied magnetic field Unlimited

Operating Specifications

Tmin to Tmax; 2.4 V < VDD < 3.6 V unless otherwise stated.

Parameter Symbol Min. Typ. Max. Units Test Condition

Supply voltage VDD 2.4 3 3.6 Volts

Operating temperature TMIN; TMAX −40 125

°C

Magnetic operate point

HOP

ADLx21 15 20 25 Oe

ADLx24 21 28 34

Operate/release differential HOP−HREL 2 14 Oe

Quiescent current

IDDQ

ADL1xx 0.06 0.12

μA

VDD = 2.4V ADL0xx 0.13 0.26

ADL9xx 35 50

ADL1xx 0.25 0.38

VDD = 3.6V ADL0xx 0.35 0.65

ADL9xx 85 120

ADL0xx / ADL1xx peak supply current IDD-PK 60 100

A VDD = 3V

Output drive current IOL-ON 100

Output low voltage VOL 0.2 V

VDD = 3.6V;

IOL-ON = 100 μA

Output leakage current IOL-OFF 0.005

Update frequency

ADL1xx 10 30 Hz

ADL0xx 20 55

Frequency response (ADL9xx) 100

kHz

ADLxxx Nanopower Digital Switches

NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 www.nve.com ©NVE Corporation

Operation

Direction of Magnetic Sensitivity

As the field varies in intensity, the digital output will turn on and off. Unlike Hall effect or other sensors, the direction of

sensitivity is in the plane of the package. The diagrams below show two permanent magnet orientations that will activate the

sensor in the direction of sensitivity:

Figure 1. Direction of magnetic sensitivity.

ADL-Series sensors are “omnipolar,” meaning the outputs turn ON when a magnetic field of either magnetic polarity is applied.

External Pull-Up Resistor

Outputs are logic low when the sensor is activated. The outputs are open-drain, and should have an external pull-up resistor. For

microcontroller interfaces, the microcontroller’s input pull-up resistors can be activated.

Typical Operation

Figure 2 shows typical ADL-Series sensor orientation. The arrow on the circuit board shows the direction of magnetic sensitivity:

Figure 2. Typical operation; the circuit board arrow shows direction of sensitivity.

Typical magnetic operate and release distances for an inexpensive 4 mm diameter by 6 mm thick ceramic disk magnet, are

illustrated in the following table:

Part

Operate

Point (typ.)

Operate

Distance

(typ.)

Release

Distance

(typ.)

ADLx21-14E 20 Oe 10 mm 12 mm

ADLx24-14E 28 Oe 9 mm 11 mm

Larger and stronger magnets allow farther operate and release distances. For more calculations, use our digital sensor switching

versus distance Web application at: www.nve.com/spec/calculators.php.

ADL-Series Sensor

ADLxxx Nanopower Digital Switches

NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 www.nve.com ©NVE Corporation

Illustrative Application Circuits

Direct-Drive LED Indicator

Although ADLxxx-14E series sensors are not capable of driving legacy LEDs, high-efficiency LEDs such as the APT3216LSECK

are visible with the 100µA drive current provided by the sensors without an external driver.

This circuit illustrates a sensor powered by a single lithium button cell with a surface-mount indicator LED:

ADL9xx-14E

10K

BR1225

APT3216

LSECK

Figure 3. Typical ADLxxx-14E application.

Two-Wire Sensor Interface Using a Voltage Regulator

ADL-Series sensors are perfect for two-wire applications, because their low supply voltage and low quiescent current provide

plenty of design margin. Two-wire interfaces need to operate over a wide power supply range. With the sensor off, the circuit must

draw a minimal residual current, typically less than 1.5 milliamps. With the sensor on, the circuit must provide enough current to

drive a significant load such as a motor or solenoid:

a. GMR Bridge b. Comparator

ADL924-14E

Out

Gnd

V+

LOAD

300

IRLML

V-

200K

NC7S

14M5X

5103

IRLML

6346

5-30 V

80 mA

max.

3.3 V

MMSZ

(3.6 V)

4685

001-10

Figure 4. Typical two-wire circuit.

In this circuit, when a magnetic field is applied to the sensor, the MOSFETs turn on, turning on the LED and powering the load.

This circuit uses an NVE DC001-10 regulator, which provides better regulation and operating latitude over the input voltage range

than a Zener diode.

With no magnetic field and the sensor off, the residual current of the circuit is dominated by the DC001 regulator’s quiescent

current, which is less than one milliamp and relatively constant over input voltage. The Zener diode provides enough voltage to

power the circuitry when the load is powered.

ADLxxx Nanopower Digital Switches

NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 www.nve.com ©NVE Corporation

Typical Performance

Average current increases with supply voltage but remains extremely low. The magnetic operate and release points are stable over

temperature and supply voltage. Update frequency increases somewhat with supply voltage.

100

150

200

250

300

350

2.4 2.6 2.8 3 3.2 3.4 3.6

Supply Voltage

Supply Current (nA)

2.4 2.6 2.8 3 3.2 3.4 3.6

Supply Voltage

Update Frequency (Hz)

-40

-30

-20

-10

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature (ºC)

Applied Field (Oe)

Operate Point

Release Point

Operate Point

2.4 2.6 2.8 3 3.2 3.4 3.6

Supply

Voltage

Magnetic Field (Oe)

Figure 5. Typical supply current

vs. supply voltage (ADL0xx; 25°C).

Figure 6. Typical magnetic operate and release

points vs. temperature (ADLx24; Vdd=3V).

Figure 7. Typical update frequency

vs. supply voltage (ADL0xx; 25°C).

Figure 8. Typical magnetic operate point

vs. supply voltage (ADLx24; 25°C).

ADLxxx Nanopower Digital Switches

NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 www.nve.com ©NVE Corporation

Part Numbering

The following example shows the ADL-Series part-numbering system:

ADL 0 21 - 14E

Base Part

ADL = 2.4 – 3.6 V

Nanopower digital switch

Duty Cycling

0 = 55 Hz typical

1 = 30 Hz typical

9 = Continuous duty

Typ. Magnetic

Operate Point

21 = 20 Oe

24 = 28 Oe

Package Type

14E = 1.1 mm x 1.1 mm

ULLGA (RoHS)

Available Parts

Available

Part

Duty

Cycled?

Update

Freq. (typ.)

Operate

Point (typ.) Package

Package

Marking

ADL021-14E Y 55 Hz 20 Oe ULLGA V

ADL024-14E Y 55 Hz 28 Oe ULLGA C

ADL121-14E Y 30 Hz 20 Oe ULLGA B

ADL124-14E Y 30 Hz 28 Oe ULLGA D

ADL921-14E N Continuous 20 Oe ULLGA M

ADL924-14E N Continuous 28 Oe ULLGA N

ADLxxx Nanopower Digital Switches

NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 www.nve.com ©NVE Corporation

Evaluation Kits

NVE offers two ADL-Series Demonstration Boards, one with a battery and one without. These inexpensive evaluation kits include

demo boards with the ultraminiature, ultralow-power ADL021 magnetic switch included. An LED shows the sensor output. A

miniature bar magnet is included so you can see for yourself how these remarkable sensors work. These miniature evaluation

boards are just 1.57 by 0.25 inches (40 x 6 mm). Images are actual size:

www.nve.com AG040-06

LED

GND

VDD

OUT

AG040C: ADL021 Externally-Powered Evaluation Board

This board has a digital output, and can be powered from a 3.3-volt nominal supply. An LED

shows the output.

www.nve.com AG040-06

LED

GND

VDD

OUT

AG040B: ADL021 Battery-Powered Demonstration Board

This board is powered by a three-volt lithium coin cell (included), and the sensor quiescent power

consumption is so low that the battery will last indefinitely.

Bare Circuit Boards

NVE offers two bare circuit boards designed for easy connections to ULLGA sensors. Note that since these boards use very small

sensors, they require reflow or hot-air soldering techniques. Images are actual size:

AG904-06: ULLGA General-Purpose PCB

1.2 x 0.25 inch (30 x 6 mm) PCB for demonstrating 1.1 x 1.1 mm ULLGA4 sensors (-14E sensor

suffix).

www.nve.com AG039-06

GND

VCC

OUT

C1 R

AG039-06: ULLGA Digital Sensor Demonstration Bare Board

A 1.57 x 0.25 inch PCB for demonstrating ADL-Series sensors (sensors sold separately). In

addition to space for the sensor, the boards have locations for 0402-size pull-up resistors and

bypass capacitors.

ADLxxx Nanopower Digital Switches

1.1 mm x 1.1 mm ULLGA Package (-14E suffix)

Bottom View

1.10

0.35 0.65

0.40

0.60

0.05 0.10

0.30

Side View

0.20

Top View

Dimensions in mm; ±0.10 mm

Direction of Sensitivity

0.40

unless otherwise noted.

1.05

1.15

1.05

1.15

Soldering profile per JEDEC J-STD-020C, MSL 1.

These products have been tested for electrostatic sensitivity to the limits stated in the specifications. However, NVE

recommends that all integrated circuits be handled with appropriate care to avoid damage. Damage caused by

inappropriate handling or storage could range from performance degradation to complete failure.

Pin 1 No Connect

Pin 2 VDD

Pin 3 Out

Pin 4 Ground

RoHS

COMPLIANT

ADLxxx Nanopower Digital Switches

Revision History

SB-00-017

November 2017 Change

• Added “Typical Operation” section and image (p. 3).

• Added Evaluation Kits and bare boards (p. 7).

SB-00-017

October 2017 Change

• Revised package outline dimensions.

SB-00-017

May 2017

Changes

• Added application circuit.

• Revised quiescent current specifications.

• Added selector guide.

• Obsoleted ADLx22 versions/

• Cosmetic changes.

SB-00-017

December 2008 Change

• Initial Release.

ADLxxx Nanopower Digital Switches

Datasheet Limitations

The information and data provided in datasheets shall define the specification of the product as agreed between NVE and its customer, unless NVE and

customer have explicitly agreed otherwise in writing. All specifications are based on NVE test protocols. In no event however, shall an agreement be

valid in which the NVE product is deemed to offer functions and qualities beyond those described in the datasheet.

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Information in this document is believed to be accurate and reliable. However, NVE does not give any representations or warranties, expressed or

implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information.

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savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on

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NVE reserves the right to make changes to information published in this document including, without limitation, specifications and product descriptions

at any time and without notice. This document supersedes and replaces all information supplied prior to its publication.

Use in Life-Critical or Safety-Critical Applications

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support, life-critical or safety-critical devices or equipment. NVE accepts no liability for inclusion or use of NVE products in such applications and such

inclusion or use is at the customer’s own risk. Should the customer use NVE products for such application whether authorized by NVE or not, the

customer shall indemnify and hold NVE harmless against all claims and damages.

Applications

Applications described in this datasheet are illustrative only. NVE makes no representation or warranty that such applications will be suitable for the

specified use without further testing or modification.

Customers are responsible for the design and operation of their applications and products using NVE products, and NVE accepts no liability for any

assistance with applications or customer product design. It is customer’s sole responsibility to determine whether the NVE product is suitable and fit for

the customer’s applications and products planned, as well as for the planned application and use of customer’s third party customers. Customers should

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NVE does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer’s

applications or products, or the application or use by customer’s third party customers. The customer is responsible for all necessary testing for the

customer’s applications and products using NVE products in order to avoid a default of the applications and the products or of the application or use by

customer’s third party customers. NVE accepts no liability in this respect.

Limiting Values

Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent damage to the

device. Limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the recommended

operating conditions of the datasheet is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the

quality and reliability of the device.

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In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. NVE hereby expressly objects to

applying the customer’s general terms and conditions with regard to the purchase of NVE products by customer.

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In the event that customer uses the product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall

use the product without NVE’s warranty of the product for such automotive applications, use and specifications, and (b) whenever customer uses the

product for automotive applications beyond NVE’s specifications such use shall be solely at customer’s own risk, and (c) customer fully indemnifies

NVE for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond NVE’s

standard warranty and NVE’s product specifications.

ADLxxx Nanopower Digital Switches

An ISO 9001 Certified Company

NVE Corporation

11409 Valley View Road

Eden Prairie, MN 55344-3617 USA

Telephone: (952) 829-9217

www.nve.com

e-mail: sensor-info@nve.com

All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.

SB-00-017

rev. Nov. 2017