AD022-00E - NVE CORPORATION

AD-Series GMR Switches

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

AD-Series GMR Switch™ Precision Digital Magnetic Sensors

Functional Diagram

GMR

Sensor

Comparator

GND

Vcc

OUT

Output

Driver

Element

Short-

Circuit

Protection

Voltage

Regulator

(optional) (optional)

Idealized Transfer Function

Features

• Digital outputs

• Precision magnetic operate point

• 4.5 V – 30 V supply voltage

• 20 mA output drive

• Temperature and voltage stability

• Models available with short-circuit protection

• Frequency response to 100 kHz

• Ultraminiature TDFN6 and MSOP8 packages

Applications

• Motion, speed, and position control

• Pneumatic cylinder position sensing

• Speed sensing

Description

AD-Series GMR Switches are the industry standard for

sensitivity and precision.

GMR Switches integrate GMR sensor elements with digital

signal processing electronics. These sensors are more precise

than other magnetic sensors, and magnetic field operate

points are stable over voltage and temperature extremes.

AD-Series models available in a wide variety of magnetic

operate points and output configurations. Versions are

available with short-circuit protection circuitry and with

integrated voltage regulators.

AD-Series GMR Switches

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

Absolute Maximum Ratings

Parameter Symbol Min. Max. Units Test Conditions

Supply voltage Except AD8xx/AD9xx VCC −33 33 Volts

AD8xx/AD9xx −0.5

Output voltage −0.5 33 Volts

Output current (AD8xx/AD9xx only) 5 mA

Operating temperature −40 125

°C

Storage temperature −65 150

°C

ESD 2000 Volts Human Body Model

Applied magnetic field H Unlimited Oe

Operating Specifications

Tmin to Tmax; 4.5 V < VCC < 30 V unless otherwise stated.

Parameter Symbol Min. Typ. Max. Units Test Conditions

Supply voltage VCC 4.5 30 Volts

Operating temperature TMIN; TMAX −40 125 °C

Magnetic operate point

HOP

ADH025 8 10 12

AD004; AD021; AD621 15 20 25

AD024 21 28 33

AD005; AD022 30 40 50

Operate/release differential

HOP−HREL

ADH025 2 8

AD004; AD021; AD621 5 14

AD024 5 15

AD005; AD022 5 25

Supply current Except AD8xx/AD9xx ICC 2.5 4.5

mA VCC = 12V;

Output Off

AD8xx/AD9xx 1.75 3.5

Output current Except AD8xx/AD9xx IO-ON 20

mA Output On

AD8xx/AD9xx 2

Sinking

output voltage

Except AD8xx/AD9xx VOL 0.2

VCC = 12V;

IO = 20mA

AD8xx/AD9xx 0.4 IO = 2mA

Sourcing

output voltage

Except AD8xx/AD9xx VOH V

CC–2.5 VCC = 12V;

IO = 20mA

AD8xx/AD9xx VCC–2 IO = 2mA

Output leakage current IO-OFF 10

μA VCC = 12V;

Output Off

Short-circuit voltage (AD8xx/AD9xx only) VShortH /

VShortL 0.12 0.17 V Output On

Regulator output

Except AD8xx/AD9xx

VREG

5.8 6.2 V

VCC > 6.6V;

0 < IREG < 20mA

3.5 VCC – 0.9 VCC < 6.6V

AD8xx/AD9xx 5.8 6 V

VCC > 6.6V;

0 < IREG < 20mA

3.5 VCC – 0.9 VCC < 6.6V

Regulator output current IREG 3 mA

Frequency response fMAX 100 kHz

Junction–Ambient Thermal Resistance θJA 320 °C/W

Soldered to double-

sided board;

free air

AD-Series GMR Switches

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

Operation

Typical operation is shown in the figures below:

GMR

Sensor

Comparator

GND

Vcc

OUT

Element

10V

ADxxx

Figure 1. Typical application.

Applied Field (Oe)

-40 -20 0 20 40

Output (V)

ON OFF OFF ON

Applied Field (Oe)

Output (V)

-5

-10

-15 15

OFF OFF

ON ON

Figure 2a. Typical output vs. magnetic field Figure 2b. Typical output vs. magnetic field

(AD024 with a 10V supply and 1 KΩ pull-up resistor). (ADH025 with a 10V supply and 1 KΩ pull-up resistor).

ON / OFF Behavior

AD-Series sensor outputs turn ON when the field exceeds the magnetic operate point, and OFF when the field drops below the

operate point minus the release differential.

External Pull-Up Resistors

Outputs are open collector, with PNP output transistors for sourcing versions and NPN transistors for sinking versions. Outputs

should have external pull-up or pull-down resistors. For microcontroller interfaces, the microcontroller’s input pull-up resistors can

be activated.

Omnipolar

GMR Switches are “omnipolar,” which means the outputs turn ON when a magnetic field of either magnetic polarity is applied.

AD-Series GMR Switches

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

In-Plane 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 3. Planar magnetic sensitivity.

Standard and Cross-Axis Sensitivity

Standard AD-Series sensors are sensitive along the part axis as shown in Figure 4b, but a number of versions are available with

cross-axis sensitivity (see Figure 4a).

Figure 4b.

Standard sensitivit

Figure 4a.

Cross-axis sensitivity.

AD-Series GMR Switches

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

Illustrative Application Circuits

Integrated Short-Circuit Protection

AD8xx and AD9xx models include integrated Short Circuit Protection (“SCP”) circuitry. A detailed block diagram of such a

device is shown below:

Source

GND

ShortL

Sink1

Vreg

Vcc

a. Comparator

b. SCP Turn-On Delay Timer

c. Off-State Timer

d. GMR Bridge

e. Comparator

AD924-00

Figure 5. Detailed block-diagram of the AD924

sensor with short-circuit protection circuitry.

Typical SCP external circuitry for sourcing and sinking SCP versions are shown in the following schematics:

AD821-00

Sink2

GND

ShortH

Sink1

Vreg

Vcc

SHORT

BIAS1

BIAS2

Output

Vcc

LED

2N2907

Figure 6. Short-circuit protection circuitry (sourcing output).

AD-Series GMR Switches

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

BIAS1

BIAS2

SHORT

AD921-00

Source

GND

ShortL

Sink

Vreg

Vcc

LED

2N2222

Output

Vcc

Figure 7. Short-circuit protection circuitry (sinking output).

If the voltage across RSHORT exceeds 145 mV (typical), the SCP circuitry is activated. An RSHORT of 0.47Ω then results in a

protection threshold of approximately 300 mA.

Capacitor C2 delays the shutdown so normal startup transients do not trigger the circuitry; a 0.001 μF capacitor can be used for a

typical 35 μs delay (t1). C1 sets the SCP “OFF” time (t2), which is typically 0.01 μF for 15 ms OFF time.

The short-circuit output current using these typical component values is shown below:

Output Current (mA)

100

200

300

400

=15 ms

=35 s=35

Figure 8. AD821 / AD921 output current with typical SCP components and output shorted

(see Figures 5 and 6 for circuits).

RBIAS1 and RBIAS2 bias the output transistor. Typical values for are 16 KΩ for RBIAS1 and 3 KΩ for RBIAS2, which provides 1 mA of

transistor base current. RLED sets the LED current up to a maximum of 3 mA.

External Short-Circuit Protection

NVE offers a separate Power Switch IC, the DB001-00, for sensor Short Circuit Protection of sensors that do not have SCP

support. The DB001 also provides a high-current output, reverse battery protection, and transient protection.

A typical circuit is as follows:

AD-Series GMR Switches

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

Cap2

Cap

Source

Ground

ShortL

Sink1

Vreg

VCC

a. Comparator

b. SCP Turn-On Delay Timer

c. Off-State Timer

d. GMR Bridge

e. Comparator

AD924-00

2 x 390 pF

16V

VCC

ISC

Sink

a. Voltage Regulator

b. Amplifier

c. Thermal Shutdown

Source

3.3 V

DB001-00

LED

Vreg

Ground

VDD (5 - 30 V)

1500 pF

GND

OUT

0.01 F

Pin 1

Pin 1 0.1 F

Figure 9. A GMR Switch with an external power switch IC for a high-power output, bullet-proof system.

AD-Series GMR Switches

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

Typical Performance Graphs

5 1015202530

Supply Voltage

Applied Field (Oe)

AD005 OP

AD005 RP

AD004 OP

AD004 RP

Applied Field (Oe)

-40 0 40 80 120

AD005 OP

AD005 RP AD004 OP

AD004 RP

Temperature (˚C)

Supply Voltage

Max. Operating Temperature (

˚C

)

100

110

120

130

4.5 10 15 20 25 30

MSOP8/

TDFN6

SOIC8

Figure 12. Operating temperature derating (free air).

Maximum Output Current (mA)

4.5 5

Supply Voltage

Figure 13. Output current vs. supply voltage.

Figure 11. Typical Operate Points (OP)

and Release Points (RP) vs. temperature.

Figure 10. Typical Operate Points (OP) and

Release Points (RP) vs. supply voltage (25°C).

AD-Series GMR Switches

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

N/C

Source

Sink2

GND

VCC

Sink1*

Vreg

Sink1*

VCC

Source

Sink2

N/C

Sink1

N/C

Vreg

GND

AD8xx-00

Sink2

Ground

VCC

ShortH

Sink1

Vreg

AD9xx-00

Source

GND

VCC

ShortL

Sink

Vreg

Cross-Axis Sensitivity

AD0xx-10

VCC

N/C

Out

Test

GND

AD0xx-10

N/C

GND

VCC

N/C

Out

Cross-Axis Sensitivity

Standard-Axis Sensitivity

ADxxx-00 ADxxx-00

Cross-Axis Sensitivity

Pinouts

MSOP GMR Switches Without Short-Circuit Protection (AD0xx-00 – AD7xx-00; ADH0xx-00):

MSOP GMR Switches With Short-Circuit Protection (AD8xx-00 – AD9xx-00):

TDFN GMR Switches (AD0xx-10):

*Sink1 on pin 7 fo

versions

without Vreg option;

pin 5 with Vreg option.

AD-Series GMR Switches

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

Part Numbering

AD 0 21 - 00E

Base Part

AD = Standard

digital switches

Outputs

0 = Sink

1 = Source

2 = Sink + Source

3 = Two Sink Outputs

4 = Sink + Regulated Output

5 = Source + Regulated Output

6 = Sink + Source + Regulated Output

7 = Two Sinks + Regulated Output

8 = Two Sinks + Regulated Output +

Short-Circuit Protection

9 = Sink + Source + Regulated Output +

Short-Circuit Protection

Operating Field

04 = 20 Oe; Standard Direction

05 = 40 Gauss; Standard Direction

20 = 28 Oe; Standard Direction

21 = 20 Oe; Cross-Axis Sensitivity

22 = 40 Oe; Cross-Axis Sensitivity

24 = 28 Oe; Cross-Axis Sensitivity

25 = 10 Oe; Cross-Axis Sensitivity

Package Type

00 = MSOP8

10 = TDFN6

E = RoHS

Stock Parts

Available

Part

Operate

Point (typ.)

Release Point

(typ.)

Output

Configuration

Max.

Operating

Temperature Package

AD004-00E 20 Oe 10 Oe Sink 125°C MSOP8

AD005-00E 40 Oe 25 Oe Sink 125°C MSOP8

AD021-00E 20 Oe 10 Oe Sink 125°C MSOP8

AD022-00E 40 Oe 25 Oe Sink 125°C MSOP8

AD024-00E 28 Oe 14 Oe Sink 125°C MSOP8

AD024-10E 28 Oe 14 Oe Sink 125°C TDFN6

AD621-00E 20 Oe 10 Oe Sink+Source 125°C MSOP8

AD824-00E 28 Oe 14 Oe 2 Sinks +

Short-Circuit Protection 150°C MSOP8

ADH025-00E 10 Oe 5 Oe Sink 150°C MSOP8

AD-Series GMR Switches

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

Package Drawings

TDFN6 (-10 suffix)

2.00 ± 0.05

C0.10

PIN 1

0.30±0.05

0.30±0.05 0.65 TYP.

1.30 REF (2X)

2.50 ± 0.10

2.50±0.10

0.0-0.05

0.80 MAX.

0.20 REF

1.30±0.05

(6X) (4X)

MSOP8 (-00 suffix)

0.114 (2.90)

0.016 (0.40)

0.005 (0.13)

0.009 (0.23)

0.027 (0.70)

0.010 (0.25)

0.002 (0.05)

0.043 (1.10)

0.032 (0.80)

0.006 (0.15)

0.016 (0.40)

0.189 (4.80)

0.197 (5.00)

0.122 (3.10)

0.024 (0.60)

0.028 (0.70)

NOTE: Pin spacing is a BASIC

dimension; tolerances

do not accumulate

Soldering profiles per JEDEC J-STD-020C, MSL1

RoHS

COMPLIANT

AD-Series GMR Switches

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

Revision History

SB-00-060-B

August 2017 Change

• Eliminated SOIC package option.

• Misc. cosmetic changes.

SB-00-060-A

March 2017 Change

• Initial datasheet release superseding catalog.

AD-Series GMR Switches

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

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.

Limited Warranty and Liability

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.

In no event shall NVE be liable for any indirect, incidental, punitive, special or consequential damages (including, without limitation, lost profits, lost

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

tort (including negligence), warranty, breach of contract or any other legal theory.

Right to Make Changes

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

Unless NVE and a customer explicitly agree otherwise in writing, NVE products are not designed, authorized or warranted to be suitable for use in life

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

provide appropriate design and operating safeguards to minimize the risks associated with their applications and products.

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.

Terms and Conditions of Sale

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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Automotive Qualified Products

Unless the datasheet expressly states that a specific NVE product is automotive qualified, the product is not suitable for automotive use. It is neither

qualified nor tested in accordance with automotive testing or application requirements. NVE accepts no liability for inclusion or use of non-automotive

qualified products in automotive equipment or applications.

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.

AD-Series GMR Switches

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

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-00-060_RevB

August 2017