ADH025-00 - NVE Corporation

GMR Switch Precision Digital Sensors

GMR Switch™ Precision Digital Sensors gital Sensors

When GMR sensor elements are combined with digital on-board signal processing

electronics, the result is the GMR Switch. The GMR Sw itch offers unmatched pr ecision

and flexibility in magnetic field sensing.

When GMR sensor elements are combined with digital on-board signal processing

electronics, the result is the GMR Switch. The GMR Sw itch offers unmatched pr ecision

and flexibility in magnetic field sensing.

The GMR Switch will accurately and reliably sense magnetic fields with less error than

any other magnetic sensor on the market today. In addition, there is little shift in the

magnetic field operate point of the GMR Switch over voltage and temperature extremes.

This gives NVE’s customer the ability to make a high precision, high tolerance magnetic

sensing assembly.

The GMR Switch will accurately and reliably sense magnetic fields with less error than

any other magnetic sensor on the market today. In addition, there is little shift in the

magnetic field operate point of the GMR Switch over voltage and temperature extremes.

This gives NVE’s customer the ability to make a high precision, high tolerance magnetic

sensing assembly.

The GMR switch can operate over a wide range of magnetic fields, and is the most

precise magnetic sensor on the market. It is the clear choice when a digital output signal

is required of a magnetic sensor.

The GMR switch can operate over a wide range of magnetic fields, and is the most

precise magnetic sensor on the market. It is the clear choice when a digital output signal

is required of a magnetic sensor.

Magnetic

Operate Point

(Gauss)

50

150

Operate Point Error Band for Typical Magnetic Sensors

(4.5V to 30V, -40C to +125C)

Allegro 3141LLT

(Hall Effect)

Honeywell SS441A

(Hall Effect)

Honeywell 2SSP

(AMR)

NVE AD023-00

(GMR)

NVE AD021-00

(GMR)

NVE AD022-00

(GMR)

The GMR Switch Holds Tighter

Operate Point Specifications

Than Any Competing Product!

200

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

(800) 467-7141 Web: www.nve.com Email: info@nve.com 11/15/02

GMR Switch Precision Digital Sensors

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

(800) 467-7141 Web: www.nve.com Email: info@nve.com 11/15/02

Quick Reference: GMR Switch Digital Sensors

The following table lists some of NV E’s most popular GMR Switch products and their

key specifications:

Part Number Typical

Magnetic

Operate

Point

(Oe1)

Typical

Magnetic

Release

Point

(Oe1)

Output

Type2 Maximum

Operation

Temperature

(°C)

Package

Type3

NVE AD004-02 20 10 Sink 125 SOIC8

NVE AD005-02 40 25 Sink 125 SOIC8

NVE AD021-00 20 10 Sink 125 MSOP8

NVE AD022-00 40 25 Sink 125 MSOP8

NVE AD024-00 28 14 Sink 125 MSOP8

NVE AD124-00 28 14 Source 125 MSOP8

NVE AD621-00 20 10 Sink +

Source 125 MSOP8

NVE AD824-00 28 18 2 Sinks +

SCP 125 MSOP8

NVE ADH025-00 11 5 Sink 150 MSOP8

Notes:

1. 1 Oersted (Oe) = 1 Gauss in air

2. Output Types:

Sink = Up to 20mA current sink

Source = Up to 20mA current source

SCP = Short Circuit Protection available for external transistor

3. See Appendix for package dimensions

Note on Availability of Products

NVE keeps about 25 of the most popular types of GMR Switch products in

stock at our manufacturing facility. However, becau se there are over 100

different varieties of GMR Switch parts, some part numbers may require a 6 to 8

week lead time before production quantities are available. Please contact NVE

for further information.

GMR Switch Product Selection Guide

NVE’s GMR Switch is available in a wide range of packaging, output type, and magnetic

trigger field varieties. The purpose of this selection guide is to explain the different

output and packaging options, as well as to provide information on how to specify the

correct part number when ordering.

All NVE GMR Switch product part numbers follow the same general form. As shown

below, the first “x” in the part number specifies output type and available voltage

regulator output, the next two x’s sp ecify trigger field and direction of sensitivity, and the

last pair specify the package type. The following sections define these variations in

detail.

NVE ADxxx-xx

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Output Type and

Available Regulator Package Type

Trigger Field, Di recti o n of

Sensitivit

y

, Low Volta

g

e O

p

eration

Output Type and Available Regulator

The first numeri c di gi t of the part n umber NVE ADxxx-xx speci fi es t he outp ut ty pe, an d

the availability of a regulated voltage supply on a separate pin. The following four output

types are available:

20 mA Current Sink

20 mA Current Source

Separate 20 mA Sink and Source

Two Separate 20 mA Sinks

All outputs turn ON when the magn e tic field is applied. An output that turns OFF when

the magnetic field is applied is available as a custom product; please consult NVE.

Some of NVE’s GMR Switches also feature a regulated supply voltage available external

to the part on a separate pin. This regulator provides a 5.8V reference capable of

supplying up to 3 mA of drive current. This regulated output may be used to run an LED

or other low power device.

GMR Switch Product Selection Guide

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

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In addition to these options, NVE recently introduced a GMR Switch that has provisions

for shutting down an external power transistor in case a short circuit is detected. This is

useful in applications where the finished sensor assembly must be “bulletproof,” or

immune to improper connection.

The following table defines the first digit in the NVE AD part number:

NVE AD x xx-xx

Number Meaning

0 20mA Current Sink

1 20 mA Current Source

2 Separate 20mA Current Sink and 20mA Current Source

3 Two Separate 20mA Current Sinks

4 20mA Current Sink + Regulated Output Voltage

5 20 mA Current Source + Regulated Output Voltage

6 Separate 20mA Current Sink and 20mA Current Source +

Regulated Output Voltage

7 Two Separate 20mA Current Sinks + Regulated Output

Voltage

8 Two Separate 20mA Current Sinks + Regulated Output

Voltage + Short Circuit Detection and Shut-Off

9 Separate 20mA Current Sink and 20mA Current Source +

Regulated Output Voltage + Short Circu it Detection and

Shut-Off

Trigger Field, Direction of Sensitivity, Low Voltage Operation

The second and third numeric digits of the part number NVE ADxxx-xx specify the

magnetic trigger field and direction of sensitivity of the part. Five different magnetic

trigger fields are available for th e GMR Switch:

- 10 Gauss (10 Oe, 1.0 mT, 0.8 kA/m)

- 20 Gauss (20 Oe, 2.0 mT, 1.6 kA/m)

- 28 Gauss (28 Oe, 2.8 mT, 2.23 kA/m)

- 40 Gauss (40 Oe, 4.0 mT, 3.2 kA/m)

- 80 Gauss (80 Oe, 8.0 mT, 6.4 kA/m)

Other magnetic trigger field levels ranging up to 250 Gauss are available on a custom

basis; please contact NVE.

GMR Switch Product Selection Guide

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

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In addition to defining the magnetic operate point, these two digits are used to define the

direction of sensitivity and optional low voltage operation. The GMR Switch can be

ordered in Standard Axis or Cro ss Axis directions of sensitivity; for definitions please see

NVE AD Series Sensitivity Direction and Pin Configuration later in this section.

NVE also makes a GMR Switch with the on-chip voltage regulator bypassed. This limits

the voltage range of the part, but allows it to operate at voltages as low as 3.0V.

The following table defines the second and third digits in the NVE AD part number:

NVE AD x xx-xx

Number Meaning

04 20 Gauss OP, Standard Direction of Sensitivity

05 40 Gauss OP, Standard Direction of Sensitivity

06 80 Gauss OP, Standard Direction of Sensitivity

20 28 Gauss OP, Standard Direction of Sensitivity

21 20 Gauss OP, Cross Axis Direction of Sensitivity

22 40 Gauss OP, Cross Axis Direction of Sensitivity

23 80 Gauss OP, Cross Axis Direction of Sensitivity

24 28 Gauss OP, Cross Axis Direction of Sensitivity

25 10 Gauss OP, Cross Axis Direction of Sensitivity

(ADH Series Only; see page 38)

81 20 Gauss OP, Cross Axis Direct ion of Sensitivity, Low Volt

82 40 Gauss OP, Cross Axis Direct ion of Sensitivity, Low Volt

83 80 Gauss OP, Cross Axis Direct ion of Sensitivity, Low Volt

84 28 Gauss OP, Cross Axis Direct ion of Sensitivity, Low Volt

Note: For parts that operate at 10 Gauss, see the following section describing the NVE

ADH Series sensors.

NVE AD Series Sensitivity Direction and Pin Configuration

Pin configuration is for the NVE AD Series GMR Switches is given in the following

diagrams. In addition, most GMR Switch parts are available with a choice of two

directions of sensitivity. “Stan dard” direction of sensitivity is defined as the direction

parallel to the edge of the package containing the pins. “Cross-Axis” direction of

GMR Switch Product Selection Guide

sensitivity is defined as the direction perpendicular to the edge of the package containing

the pins. Pin configuration and sensitivity direction for th e SOIC8 and MSOP8 packages

are defined in the dra wings below:

NVE AD0xx-xx through NVE AD7xx-xx, NVE ADH0xx-xx:

Standard Axis

N/C

Source

Sink(2)

Ground

VCC

N/C*

Vreg

Sink(1)

Cross Axis

VCC

Source

Sink(2)

N/C

Sink(1)

N/C*

Vreg

Ground

Note: In the case of a Standard Axis Part with the Vreg pin option, Sink(1) will appear at the pin labelled N/C*

NVE AD8xx-xx through NVE AD9xx-xx:

AD8xx-xx

Cap2

Cap

Sink(2)

Ground

VCC

ShortH

Sink(1)

Vreg

AD9xx-xx

Cap2

Cap

Source

Ground

VCC

ShortL

Sink

Vreg

Cross Axis Cross Axis

Pin configuration and sensitivity direction for the AD0xx-10 TDFN6 package are defined

in the drawing below:

AD0xx-10

VCC

N/C

Out

Test

Ground

Cross Axis

AD0xx-10

N/C

Ground

VCC

N/C

Out

Standard Axis

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GMR Switch Product Selection Guide

Package Type

NVE GMR Switches are available in three different packages: an SOIC 8 pin package,

an MSOP 8 pin small outline package, and a TDFN 6 pin ultra-miniature package.

Package drawings are shown in the Appendix.

The following table defines the last two digits in the NVE AD part number:

NVE AD x xx-xx

Number Package Type

00 MSOP8

02 SOIC8

101 TDFN6

Note1: At this time, the TDFN6 package is only available in AD0xx-10 configuration.

In addition to these three package typ e s, NVE offers a custom version of the MSOP8

package for the NVE AD024-00 part. In this version, the BD012-00, all three

connections are made on one side of the package, and the pins on the other side of the

package are clipped off flush with the body of the package. This allows the user to

position the sensing element as close to the edge of a circuit board or assembly as

possible. A pinout of this package is shown below:

BD012-00

Cross Axis

VCC

N/C*

Out

Ground

The maximum length of the clipped leads is 0.30mm, leading to an overall package

length of 4.25mm, as compared to 4.90mm for the normal MSOP8 package. This part is

available in tape and reel format only.

Other versions of the GMR Switch may be available in this package configuration on a

special order basis. Please contact NVE for further information.

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

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GMR Switch Product Selection Guide

Characteristics Over Voltage and Temperature

Typical O per at e Poi nt s (OP) and Rel ease Points ( RP)

A D004 and A D005

0

10

20

30

40

50

5 1015202530

Supply Voltage

Applied Field

(Oersteds)

AD005 OP

AD005 RP

AD004 OP

AD004 RP

A

mbient Temperature = 25C

O per at e Poi nt ( O P) and Rel ease Poi nt ( RP) Var i ati on

O ver Tem per at ur e

0

10

20

30

40

50

-40 0 40 80 120

Temperature (C)

Applied Field (Oe)

AD005 OP

AD005 RP

AD004 OP

AD004 RP

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GMR Switch Product Selection Guide

Operating Temperature Deratin g C urves f or SOIC8,

MSOP8, and TDFN6 Packages in Free Air

80

90

100

110

120

130

5 1015202530

Supply Voltage (V)

Tem perature (C)

SOIC8

MSOP8

and

TDFN6

Output Cu rrent Deratin g Cu rve

10

15

20

25

4.5 6 7.5 9 10.5

Suppl y Vol ta ge (V)

Maximum Output

Cur r en t (mA)

(Continues to 30V)

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AD0xx-xx to AD7xx-xx

Features:

⇒ Precision Magnetic Operate Point

⇒ Excellent Temperature and Voltage Performance

⇒ Digital Outputs

⇒ Frequency Response 0 to 250KHz

⇒ Optional Voltage Regulator Output

⇒ Optional Low Voltage Version

⇒ Small, Low Profile Surface Mount Packages

Applications:

⇒ General Digital Position Sensin g

⇒ Pneumatic Cylinder Position Sensing

⇒ Speed Sensing

Description:

The NVE AD0xx-xx to AD7xx-xx GMR Switches are digital output magnetometers that

offers precision operate points over all temperature and input voltage conditions. They

are available with magnetic trigger fields from 20 to 80 Gauss, and four different output

configurations, making them an extremely flexible and user-friendly design .

Functional Block Diagram (NVE AD0xx-xx to NVE AD7xx-xx,

Except NVE AD08x-xx):

Voltage

Regulator

(5.8V)

GMR

Bridge

Current Sinking

Output

4.5V to 30V

Comparator

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

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AD0xx-xx to AD7xx-xx

Functional Block Diagram (NVE AD08x-xx):

GMR

Bridge

Current Sinking

Output

3.0V to 6.0V

Comparator

O ut put Charact e rist i c as a Function of M agneti c

Fiel d, for AD024-00 G M R Swit ch

0

2

4

6

8

10

12

-40 -20 0 20 40

Applied Magnetic Fie l d (Oe )

Output Curre nt, m A

(10V Supply, 1K Loa d Re sistor)

ON OFF OFF ON

Magnetic Characteristics:

Typical Operate

Point Minimum

Operate Point Maximum Operate

Point Minimum

Differential1,2 Maximum

Differential1,2

20 15 25 5 14

28 21 34 5 20

40 30 50 5 25

80 60 100 5 35

Note: All Values in Oersteds (Oe); 1 Oe = 1 Gauss in Air

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

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AD0xx-xx to AD7xx-xx

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

(800) 467-7141 Web: www.nve.com Email: info@nve.com 11/15/02

Electrical Specifications (NVE AD0xx-xx to NVE AD7xx-xx,

except NVE AD08x-xx):

Parameter Symbol Min Max Units Test Condition

Supply Voltage4 VCC 4.5 30 V Operating

Supply Current, Single Output ICC 2.5 4.5 mA Output Off, VCC=12V

Current Sinking Output3 IO 0 20 mA3 Operating

Current Sourcing Output3 IO 0 20 mA3 Operating

Output Leakage Current ILEAK 10

μA Output Off, VCC=12V

Sinking Output Saturation Voltage VOL 0.4 V Output On, IOL=20mA

Sourcing Output Saturation Voltage VOH V

CC-2.5 V Output On, IOL=20mA

Regulated Output Voltage6 VREG 3.5 6.2 V Operating

Regulated Output Current IREG 3.0 mA Operating

Electrical Specifications (NVE AD08x-xx):

Parameter Symbol Min Max Units Test Condition

Supply Voltage VCC 3.0 6.0 V Operating

Supply Current, Single Output ICC 0.7 1.2 mA Output Off, VCC=3V

Supply Current, Single Output ICC 1.7 2.2 mA Output Off, VCC=6V

Current Sinking Output2 IO 0 20 mA3 Operating

Output Leakage Current ILEAK 10

μA Output Off, VCC=5V

Sinking Output Saturation Voltage VOL 0.4 V Output On, IOL=20mA

Absolute Maximum Ratings (NVE AD0xx-xx to NVE AD7xx-xx,

except NVE AD08x-xx):

Parameter Symbol Min Max Units

Supply Voltage VCC 33 V

Reverse Battery Voltage VRBP -33 V

Current Sinking Output Off Voltage 33 V

Current Sourcing Output Off Voltage 0 V

Current Sinking Reverse Output Voltage -0.5 V

Current Sourcing Reverse Output Voltage -0.5 V

Continuous Output Current I0 24 mA

Operating Temperature Range4 TA -40 125 °C

Storage Temperature Range TS -65 150 °C

Magnetic Field5 H None Oe

AD0xx-xx to AD7xx-xx

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

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Absolute Maximum Ratings (NVE AD08x-xx):

Parameter Symbol Min Max Units

Supply Voltage VCC 7 V

Reverse Battery Voltage VRBP -0.5 V

Current Sinking Output Off Voltage 33 V

Current Sinking Reverse Output Voltage -0.5 V

Continuous Output Current I0 24 mA

Operating Temperature Range4 TA -40 125 °C

Storage Temperature Range TS -65 150 °C

Magnetic Field5 H None Oe

Notes:

1. Differential = Operate Point – Release Point

2. Minimum Release Point for AD0xx-x x to AD7xx-xx, except AD08x-xx, = 5 Oe. Minimum Release

Point for AD08x-xx = 3.5 Oe.

3. Output current must be limited by a series resistor. Exceeding absolute maximum continuous output

current ratings will result in damage to the part. See the figure in the GMR Switch Product Selection

Guide for an output current derating curve.

4. Thermal power dissipation for the packages used by NVE is 240°C/Watt for the SOIC8 package,

and 320°C/Watt for the MSOP8 and TDFN6 packages. See the Figure on Ambient Temperature vs.

Supply Voltage for derating information. Heat sinking the parts by attaching them to a PCB

improves temperature perform ance.

5. There is no maximum magnetic field that will cause damage to the device.

6. If VCC>6.6V, VREG=5.8V. If VCC<6.6V, VREG= VCC – 0.9V.

AD8xx-xx to AD9xx-xx

Features:

⇒ Short Circuit Detection and Shutoff of External Power Transisto r

⇒ Precision Magnetic Operate Point

⇒ Excellent Temperature and Voltage Performance

⇒ Digital Outputs

⇒ Frequency Response 0 to 250KHz

⇒ Small, Low Profile Surface Mount Packages

Applications:

⇒ General Digital Position Sensin g

⇒ Pneumatic Cylinder Position Sensing

⇒ Speed Sensing

Description:

NVE AD8xx and AD9xx GMR Switches are designed specifically for use with an

external high current outpu t transistor in industrial control environments. These parts

provide the same precise magnetic performance NVE’s GMR Switch is known for, with

the additional fun c tionality of short circuit protection (SCP) for the outpu t stage of the

circuit. The protection circuit is designed to shut off the output stage when a short circuit

condition exists; after a ti me interval specified by the user, the circuit turns back on. If

the short circuit cond ition still exists, the output stage is again shut off and the cycle

repeats. The use of this sensor, along with external reverse battery protection and

overvoltage protection, results in a “bulletproof” sensor assembly. A functional block

diagram of this sensor is shown below:

VDD Vreg

GMR

Bridge

Sink1

Sink2

ShortH

Cap2 SCP Turn

On Delay

Cap Off State

Timer

Ground

Comparator Comparator

These digital sensors with SCP are available for use with current sinking or current

sourcing outputs, in a range of magnetic field operate points. They are provided in an

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

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AD8xx-xx to AD9xx-xx

MSOP8 package, with the cross-axis direction of sensitivity. An LED driver to indicate

the presence of the magnetic field is also standard on these products. An SOIC8 package

and standard axis sen sitivity are available on a special order basis.

Typical Circuit Configuration:

AD821-00

Cap2

Cap

Sink2

Ground

ShortH

Sink1

Vreg

VDD

t

1

Capt

2

Cap

R

SHORT

R

BIAS1

R

BIAS2

Output

VDD

R

LED

Pin 1

AD921-00

Cap2

Cap

Source

Ground

ShortL

Sink1

Vreg

VDD

t

1

Capt

2

Cap

R

BIAS1

R

BIAS2

Output

VDD

R

LED

Pin 1

R

SHORT

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AD8xx-xx to AD9xx-xx

Output Transistor Current in Short Circuit mode:

Current (mA)

100

200

300

Time

t2t1

Output Transistor Current in Short Circuit

Notes:

1. The t2 Cap is used to delay the startup of the SCP circuitry, in order to avoid triggering the SCP

circuitry on normal startup transients: see t2 on the graph above. Typical value is 16V, 0.001μF, for

a 35μs delay.

2. The t1 Cap is used to set the “Off” time of the SCP circuitry; see t1 on the graph above. Typical

value is 16V, 0.01μF, for a 15ms Off time.

3. The voltage across RSHORT is monitored by the IC; if this voltage exceeds 145mV (typical), the SCP

circuitry is activated. Typical value of RSHORT is 0.47 Ohms, 1/16 watt. This will result in SCP

circuitry turning on at about 300mA of output current.

4. RBIAS1 and RBIAS2 are used to bias the output transistor. Typical values for RBIAS1 and RBIAS2 are 16K

and 3K, respectively, to supply 1mA drive to the output transistor.

5. RLED is sized for whatever LED current is required by the user; maximum of 3 mA.

Magnetic Characteristics:

Typical Operate

Point Minimum

Operate Point Maximum

Operate Point Minimum

Differential1,2 Maximum

Differential1,2

20 15 25 5 14

28 21 32.5 5 15

40 30 50 5 25

80 60 100 5 35

Note: All Values in Oersteds (Oe); 1 Oe = 1 Gauss in Air

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

(800) 467-7141 Web: www.nve.com Email: info@nve.com 11/15/02

AD8xx-xx to AD9xx-xx

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

(800) 467-7141 Web: www.nve.com Email: info@nve.com 11/15/02

Electrical Specifications:

Parameter Symbol Min Max Units Test Condition

Supply Voltage4 VCC 4.5 30 V Operating

Supply Current ICC 1.75 3.5 mA Output Off, VCC=12V

Current Sinking Output2 IO 0 2.0 mA3 Operating

Current Sourcing Output2 IO 0 2.0 mA3 Operating

Output Leakage Current ILEAK 10

μA Output Off, VCC=12V

Sinking Output Saturation Voltage VOL 0.4 V Output On, IOL=2mA

Sourcing Output Saturation Voltage VOH V

CC-2.0 V Output On, IOL=2mA

Regulated Output Voltage6 VREG 3.5 6.0 V Operating

Regulated Output Current IREG 3.0 mA Operating

Short High Voltage ShortH 0.12 0.17 V Output On

Short Low Voltage ShortL 0.12 0.17 V Output On

Absolute Maximum Ratings:

Parameter Symbol Min Max Units

Supply Voltage VCC 33 V

Reverse Battery Voltage VRBP -0.5 V

Current Sinking Output Off Voltage 33 V

Current Sourcing Output Off Voltage 0 V

Current Sinking Reverse Output Voltage -0.5 V

Current Sourcing Reverse Output Voltage -0.5 V

Continuous Output Current I0 5 mA

Operating Temperature Range4 TA -40 125 °C

Storage Temperature Range TS -65 135 °C

Magnetic Field5 H None Oe

Notes:

1. Differential = Operate Point – Release Point

2. Minimum Release Point for AD8xx-xx to AD9xx-xx = 5 Oe.

3. Output current must be limited by a series resistor. Exceeding absolute maximum continuous output

current ratings will result in damage to the part.

4. Thermal power dissipation for the packages used by NVE is 240°C/Watt for the SOIC8 package, and

320°C/Watt for the MSOP8 and TDFN6 packages. See the Figure on Ambient Temperature vs. Supply

Voltage for derating information. Heat sinking the parts by attaching them to a PCB improves

temperature performance.

5. There is no maximum magnetic field that will cause damage to the device.

6. If VCC>6.6V, VREG=5.8V. If VCC<6.6V, VREG= VCC –0.9V.

ADH0xx-xx ADH0xx-xx

Features: Features:

⇒ Precision Low Field Magnetic Oper ate Point ⇒ Precision Low Field Magnetic Oper ate Point

⇒ Excellent Temperature and Voltage Performance ⇒ Excellent Temperature and Voltage Performance

⇒ Digital Output ⇒ Digital Output

⇒ Frequency Response 0 to 250KHz ⇒ Frequency Response 0 to 250KHz

⇒ Small, Low Profile Surface Mount Packages ⇒ Small, Low Profile Surface Mount Packages

Applications: Applications:

⇒ Low Field Digital Position Sensing ⇒ Low Field Digital Position Sensing

⇒ Pneumatic Cylinder Position Sensing ⇒ Pneumatic Cylinder Position Sensing

⇒ Speed Sensing ⇒ Speed Sensing

Description: Description:

The NVE ADH0xx Series GMR Switch uses NVE’s high sensitivity, high temperature

GMR material to provide a very low magnetic field operate point. It offers the same

precision operate points ov er all temperature and input voltage conditions as our other

GMR Switch products. It is available in standard form as the NVE ADH025-00 with a

magnetic trigger field of 10 Gauss, a current sinking output, and a cross axis

configuration. Custom versions with trigger fields ranging from 6 to 40 Gauss, and

different output op tions and sensitivity directions could be manufactured for specific

customer requirements; please contact NVE for details.

The NVE ADH0xx Series GMR Switch uses NVE’s high sensitivity, high temperature

GMR material to provide a very low magnetic field operate point. It offers the same

precision operate points ov er all temperature and input voltage conditions as our other

GMR Switch products. It is available in standard form as the NVE ADH025-00 with a

magnetic trigger field of 10 Gauss, a current sinking output, and a cross axis

configuration. Custom versions with trigger fields ranging from 6 to 40 Gauss, and

different output op tions and sensitivity directions could be manufactured for specific

customer requirements; please contact NVE for details.

Note: Functional Block Diagram for th e NVE ADH0xx-xx Series sensors is the same as

for the NVE AD0xx-xx sensors.

Note: Functional Block Diagram for th e NVE ADH0xx-xx Series sensors is the same as

for the NVE AD0xx-xx sensors.

Output Characteristic as a Function of Magnetic

Field, ADH025-00

0

2

4

6

8

10

12

-14 -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14

A

pplied Magnetic Field (Oe)

Output Current, mA

(10V Supply, 1K Load Resistor)

OFF OFF ONON

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

(800) 467-7141 Web: www.nve.com Email: info@nve.com 11/15/02

NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA

(800) 467-7141 Web: www.nve.com Email: info@nve.com 11/15/02

Magnetic Characteristics, NVE ADH025-00:

Typical Operate

Point Minimum

Operate Point Maximum

Operate Point Minimum

Differential1 Maximum

Differential1

10 8 12 3.5 10

Note: All Values in Oersteds (Oe); 1 Oe = 1 Gauss in Air

Electrical Specifications, NVE ADH0xx-xx:

Parameter Symbol Min Max Units Test Condition

Supply Voltage4 VCC 4.5 30 V Operating

Supply Current, Single Output ICC 3.0 6.0 mA Output Off, VCC=12V

Current Sinking Output3 IO 0 20 mA3 Operating

Output Leakage Current ILEAK 10

μA Output Off, VCC=12V

Sinking Output Saturation Voltage VOL 0.4 V Output On, IOL=20mA

Absolute Maximum Ratings:

Parameter Symbol Min Max Units

Supply Voltage VCC 33 V

Reverse Battery Voltage VRBP -33 V

Current Sinking Output Off Voltage 33 V

Current Sourcing Output Off Voltage 0 V

Current Sinking Reverse Output Voltage -0.5 V

Current Sourcing Reverse Output Voltage -0.5 V

Continuous Output Current I0 24 mA

Operating Temperature Range4 TA -40 125 °C

Storage Temperature Range TS -65 150 °C

Magnetic Field5 H None Oe

Notes:

1. Differential = Operate Point – Release Point

2. Minimum Release Point for ADH0xx-xx = 2.0 Oe.

3. Output current must be limited by a series resistor. Exceeding absolute maximum continuous output

current ratings will result in damage to the part. See the figure in the GMR Switch Product Selection

Guide for an output current derating curve.

4. Thermal power dissipation for the packages used by NVE is 240°C/Watt for the SOIC8 package,

and 320°C/Watt for the MSOP8 and TDFN6 packages. See the Figure on Ambient Temperature vs.

Supply Voltage for derating information. Heat sinking the parts by attaching them to a PCB

improves temperature perform ance.

5. There is no maximum magnetic field that will cause damage to the device.