- 46 - GT Sensors Precision Gear Tooth and Encoder Sensors

- 46 - GT Sensors   Precision Gear Tooth and Encoder Sensors

GT Sensors

Precision Gear Tooth and Encoder Sensors

NVE’s GT Sensor

 products are based on a Low Hysteresis GMR sensor material and are designed for use in industrial speed applications where magnetic detection of gear teeth and magnetic encoder wheels is required.

GT Sensors with both analog and digital outputs are available. The analog parts feature the large signal and robust characteristics which NVE’s GMR materials are known for (NVE’s GMR sensors are not damaged by extremely large magnetic fields). The sensor elements themselves are designed to provide usable output with even the smallest gear teeth. Single and double output versions are available; the second output is phase shifted with respect to the first, to provide quadrature for determining direction.

The digital sensors take advantage of the high performance characteristics of GMR sensors to provide a 50% duty cycle output with a wide tolerance in airgap and temperature variations.

GT Sensors are available in low-profile MSOP8,

TDFN SO8, and TDFN6 packages, in order to fit into the tightest possible spaces. An evaluation kit is available, containing a selection of sensors, magnets, and PCBs, so that the user can test the parts in their application

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ABL Sensors

Single/Double Bridge Gear Tooth And Encoder Sensors

Features:

• Large Airgap

• Direct Analog Output

• DC (Zero Speed) Operation

• Sine / Cosine Outputs

• Precise Spacing and Phase Shifting Between Sensor Elements

• Excellent Temperature and Voltage Performance

• Small, Low-Profile Surface Mount Packages

Applications:

• Linear and Angular Speed Sensing

• Linear and Angular Position Sensing

• Direction Detection

Description:

The ABL-Series GT Sensors are differential sensor elements that provide an analog sinusoidal output signal when used with a bias magnet and gear tooth or a magnetic encoder. These chips use NVE’s proprietary GMR sensor elements featuring an extremely large output signal from the raw sensor element, which is stable over the rated temperature and voltage range. As a result, ABL-Series GT

Sensors feature excellent airgap performance and an extremely stable operating envelope as well as the robust reliability characteristics that NVE sensors are known for.

Three different standard spacings are available for use with fine and coarse pitch encoders and gear teeth. Both single bridge and double bridge configurations are also available. Double bridges are used to generate sine/cosine outputs. In addition to the standard spacings, NVE can provide custom spacings and multiple sensor elements tailored to the individual customer’s application for a nominal design and tooling charge. Contact NVE for further details.

For digital output applications, these sensors can be used with NVE’s DD001-12 signal processing IC which converts their output into a 50% duty cycle modulated current signal. This IC allows placement of the ABL sensor in a very small housing with wires running from the sensor to the signal processing

IC in a remote location. Thus ABL-Series sensors can be used in M8 and smaller housings.

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Specifications:

Single Bridge Resistance at 25°C

Input Voltage

Operating Temperature Range

Offset Voltage

Linear Range

Linearity of Output

Saturation of GMR Sensor Elements

Single Resistor Sensitivity

Max Output

Temperature Coefficient of Resistance

4K

<1

1

-50

-4

±5

98

-180

5K 7K

30

1

+150

+4

±100

.04

80

+0.11

+180

Ohms

Volts

°

C mV/V

Oe

%

2

Oe

3

%

R/Oe

4 mV/V

%/

°

C

Storage Temperature Range

Notes:

-65 +170

°

C

1. ABL-Series sensors have a purely ratiometric output. They will operate with input voltages of 0.1 V or lower. The output signal will scale proportionally with the input voltage. Maximum voltage will be limited by the power dissipation allowable in the package and user installation. See the package section for more details.

2. Linearity and Hysteresis measured across linear operating range, unipolar operation.

3. Application of a magnetic field in excess of this value will saturate the GMR sensor elements and no further output will be obtained. No damage occurs to the sensor elements when saturated. NVE GMR sensors will not be damaged by any large

magnetic field.

4. Percent change in resistance with application of 1 Oersted of magnetic field; corresponds to an 8% change in resistance with 200 Oersteds of applied magnetic field (1 Oersted = 1 Gauss in air, or 0.1 milliTesla).

5. Pin-to-pin voltage, Human Body Model for ESD.

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IC Drawings:

ABL004

Center of Die and Package

0.140

1.000

0.500

ABL005

0.500

0.250

ABL014

1.000

0.250

0.250

1.000

0.500

ABL015

0.500

0.500

0.125

0.125

0.250

- All dimensions in mm

- All resistors are 5k

- Sensor elements are located symmetrically about the center of the IC.

Note: ABL006 ABL016 Sensor Element Size and Spacing Not Shown

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Schematics:

ABL004, ABL005, ABL006

Schematic

R4

OUT-

R2

VCC

R1

R3

OUT+

GND

VCC1 VCC2

OUT-1

R4

R1

ABL014, ABL015, ABL016

Schematic

(Dual Bridge)

OUT+1 OUT-2

R8

R5

R3 R7

R2 R6

GND1

Part Numbers and Configurations:

GND2

Part Number

Single or Dual

Bridge

Element

Spacing

(Microns)

Phase Shift

Between

Bridges

(Microns)

Package

Marking

ABL004-00 Single 1000 NA FDB

ABL005-00 Single 500 NA FDC

ABL006-00 Single 300 NA FDL

ABL014-00 Dual 1000 500 FDD

ABL015-00 Dual 500 250 FDF

ABL016-00 Dual 300 150 FDM

ABL004-10 Single 1000 NA FDG

ABL005-10 Single 500 NA FDH

ABL006-10 Single 300 NA FDN

ABL014-10 Dual 1000 500 FDJ

ABL015-10 Dual 500 250 FDK

ABL016-10 Dual 300 150 FDP

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OUT+2

Packages:

The ABL-Series parts are available in MSOP8 and TDFN6 packages. Please see the package drawing section in the Appendix for dimensions. Please note that for dual differential sensors in the TDFN package the power and ground connections for both bridges are common.

Pin Configuration:

MSOP8 Package

Out+

No Connect

No Connect

Ground

ABL004-00,

ABL005-00,

ABL006-00

VCC

No Connect

No Connect

Out-

Ground1

Out-1

Out+1

VCC1

ABL014-00,

ABL015-00,

ABL016-00

VCC2

Out+2

Out-2

Ground2

TDFN6 Package

Out+

No Connect

Gnd

ABL004-10,

ABL005-10,

VCC

No Connect

Out-

Ground1,

Ground2

Out-1

Out+1

ABL014-10,

ABL015-10,

ABL016-10

VCC1

VCC2

Out+2

Out-2

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AKL Sensors

Digital Output Gear Tooth And Encoder Sensors

Features:

• Large Airgap

• 50% Duty Cycle

• DC (Zero Speed) Operation

• Precise Spacing Between Sensor Elements

• Excellent Temperature and Voltage Performance

• Small, Low-Profile Surface Mount Package

Applications:

• Anti-lock Brake System Sensors

• Transmission Speed Sensors

• Industrial Linear and Angular Speed Sensing

• Linear and Angular Position Sensing

Description:

NVE offers these products specifically for use as sensors for gear tooth wheels or magnetic encoders with a digital output signal. The pulse output from the sensor corresponds with the gear teeth passing in front of it. When a gear tooth or magnetic pole is in front of the sensor, the sensor’s output goes high; when the gear tooth or magnetic pole moves away, the output returns to low. This repeats at every tooth/pole resulting in a pulse train output that provides speed information from the gear or encoder. Three part numbers are currently available: the AKL001-12 is designed for gear teeth or encoders with a pitch of 2.5 to 6 mm, the AKL002-12 for a pitch of 1 to 2.5 mm, and the AKL003-12 for a pitch of 0.6 to 1.5 mm.

In order to minimize the number of wires leading to the sensor, the part is configured as a two-wire device. The two output states are indicated with a change of current through the part. Therefore, when the part is in the digital low state, current is about 3 mA. When the part is in the digital high state, the current increases to about 10 mA. If necessary, the two-wire output of the AKL-Series parts can be easily converted to a three-wire current sinking output with the circuit shown in the GT Sensor applications section.

The parts are rated for the full automotive and industrial temperature range, -40°C to +150°C. They feature reverse battery protection and have an operational voltage range of 4.5V to 36V. They operate from DC to 10 kHz. The parts are available in low-profile, surface mount TDFN SO8 packages.

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Specifications:

Input Voltage

Supply Current in Off State

(Input Voltage=12V)

Supply Current in On State

(Input Voltage=12V)

Output Duty Cycle

Operating Temperature Range

4.5 36 Volts

1 mA

2 mA

2

40

-40

50 60

+150

%

°

C

AKL001-12 Airgap, Over Full Temperature and

Voltage Range

4

AKL002-12 Airgap, Over Full Temperature and

Voltage Range

4

AKL003-12 Airgap, Over Full Temperature and

Voltage Range

4

Frequency of Operation 0 10K Hz

Absolute Maximum Ratings

Parameter Limit

Supply Voltage

Reverse Battery Voltage

Continuous Output Current

Junction Temperature Range

Storage Temperature Range

45V

-60V

16mA

-40

°

C to +170

°

C

-65

°

C to +170

°

C

Signal Output

10

Current

Output

(mA)

5

Time

Notes:

1. The supply voltage must appear across the power and ground terminals of the part. Any additional voltage drop due to the presence of a series resistor is not included in this specification.

2. Supply currents can be factory programmed to different levels, for example 3 mA and 6 mA, or 7 mA and 14 mA; contact NVE for details.

3. Pin-to-pin voltage, Human Body Model for ESD

4. Airgap measured with standard ferrous gear tooth; contact NVE for details.

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IC Drawings:

The AKL-Series products use the ABL sensor elements described earlier in this section. The AKL001-

12 part uses the ABL004 sensor element, the AKL002-12 uses the ABL005 sensor element, and the

AKL003-12 uses the ABL006 sensor element. Please see the IC drawings in the ABL-Series section for more information.

Part Numbers and Configurations:

Part Number

Single or Dual

Bridge

Element

Spacing

(Microns) Marking

Schematic:

A block diagram of the AKL-Series parts is shown below:

Voltage

Regulator

3.3V

Switching

Current

Source

GMR

Bridge

A

Offset

Detector

EEPROM

Gain

A

Current Level

Packages:

The AKL-Series parts are available in the TDFN8 SO8 package. Please see the package drawing section in the Appendix for dimensions.

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Pin Configuration:

TDFN8-SO8 Package

TEST

TEST

TEST

BRIDGE+

AKL001-12

AKL002-12

AKL003-12

Sensitivity

TEST

BRIDGE-

VCC

Note: Bridge + and Bridge - are provided for analysis purposes only. NVE does not recommend connecting these pins in a production product for ESD and loading reasons. Also, all pins labeled “Test” must be floating, i.e., not connected to each other or any other circuit node.

GND

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Peripheral Integrated Circuits

DD-Series Signal Processing ICs

For use with ABL-Series Sensors

Features:

• Converts Analog Sensor to Digital Operation

• Two-Wire Output

• 50% Duty Cycle

• DC (Zero Speed) Operation

• Excellent Temperature and Voltage Performance

• Small, Low-Profile Surface Mount Package

Applications:

• Linear and Angular Speed Sensing

• Linear and Angular Position Sensing

• Direction Detection

Description:

The DD-Series signal processing IC is designed to take an analog, sinusoidal input signal such as that provided by NVE’s ABL-Series sensors and convert it to a two wire, current modulated digital output.

Inputs as small as 2 mV peak-to-peak can be provided to the IC, along with large signal offsets. The

DD001-12 part will provide a 50% duty cycle digital output signal.

The DD001-12 part contains a voltage regulator circuit, programmable amplifier, offset detection and correction circuitry, and an EEPROM for setting gain and current levels. The voltage regulator output

(3.3V) is used to power the external sensor element, which should be connected between V

REG

and

V

GND

. Nominal current levels for the current modulated output are 3 mA and 10 mA. These can be factory programmed to different levels for specific customer requirements.

Using the DD-Series signal processing IC allows the user to put the sensor element, which can very small in a remote location, and pipe the signals from the sensor to the DD001-12 for digitizing purposes. In addition, if two phase shifted sensor outputs are available (such as with the ABL014-00,

ABL015-00, and ABL015-00sensors), two DD001-12 parts can be used to provide two phase shifted digital signals, for the purpose of detecting the direction of the gear tooth or encoder wheel.

The two-wire output of the DD001-12 can be easily converted to a three-wire current-sinking output with the circuit shown in the GT Sensor applications section.

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Peripheral Integrated Circuits

Specifications:

Parameter

Input Voltage

Input Voltage Signal

Input Current

Min Typ Max Unit

4.5 36 Volts

1

2 200

10 mV

2

µ

A mA

3

Supply Current – Off

(Input Voltage=12V)

Supply Current – On

(Input Voltage=12V)

Output Duty Cycle

Regulated Voltage Output

Current Supplied by Regulated Voltage Output

Operating Temperature Range

Frequency of Operation mA

3

40

3.0

-40

0

50

3.3

60

3.6

10

+150

10k

%

Volts mA

°

C

Hz

Absolute Maximum Ratings

Parameter Limit

Supply Voltage

Reverse Battery Voltage

Output Current

Junction Temperature Range

Storage Temperature Range

45V

-60V

16mA

-40

°

C to +170

°

C

-65

°

C to +170

°

C

Signal Output

10

Current

Output

(mA)

5

Time

Notes:

1. The supply voltage must appear across the power and ground terminals of the part. Any additional voltage drop due to the presence of a series resistor is not included in this specification.

2. Input signal range can be adjusted by programming the amplifier gain to a specific value; contact NVE for details.

3. Supply currents can be factory programmed to different levels, for example 3 mA and 6 mA, or 7 mA and 14 mA; contact

NVE for details.

4. Pin-to-pin voltage, Human Body Model for ESD.

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Peripheral Integrated Circuits

Schematic:

A block representation of the DD-Series parts is shown below:

Vreg

Voltage

Regulator

3.3V

Switching

Current

Source

Bridge +

Bridge -

Offset

Detector

EEPROM

Gain

Current Level

Packages:

The DD-Series parts are available in the TDFN SO8 package. Please see the package drawing section in this catalog for dimensions.

Pin Configuration:

TDFN-SO8 Package

Test

Vreg

VCC

DD001-12

Test

Test

Bridge+

Note: Bridge + and Bridge

-

should be connected only to the sensor element outputs for ESD and loading reasons. Vreg can supply up to 10 mA at 3.3V (330

Ω load). Also, all pins labeled “Test” must be floating, i.e., not connected to each other or any other circuit node.

Ground Bridge-

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Evaluation Kits

Evaluation Kits

In order for our customers to evaluate GMR sensors in their application NVE makes available several evaluation kits, at nominal cost, so that customers can try the actual parts in their application. These kits are described below:

AG001-01 - Analog Sensor Evaluation Kit

This kit features several types of NVE’s AA and AB-Series parts, a selection of permanent magnets for activation or bias purposes, and circuit boards to mount the parts for testing purposes.

Also included is a copy of NVE’s catalog and application notes on CD ROM.

AG003-01 - Current Sensor Evaluation Kit

This kit features a specially designed circuit board with traces running under the sensor elements.

The customer can try different current levels to see the output from the sensor. Also included is a copy of NVE’s catalog and application notes on CD ROM and a copy of NVE’s Current

Calculator spreadsheet.

AG910-07, AG911-07 - GMR Switch Evaluation Kits

These kits include several GMR Switch parts with different magnetic operate points and different output options such as current sink and current source. In addition, magnets and circuit boards for mounting the parts in the application are included along with a copy of NVE’s catalog and application notes on CD ROM. In the AG910-07 kit, a socket for easy testing of the MSOP-8L package is also included.

AG920-07 - GT Sensor Evaluation Kit

NVE’s newest evaluation kit includes analog and digital versions of the GT sensor product line plus our DD001-12 stand-alone signal processing IC. A variety of PCB configurations are provided so that the parts can be tested in different housing and barrel sizes including the M8 housing. Magnets for biasing are also included along with NVE’s catalog and application notes on

CD ROM.

Evaluation kits may be ordered direct from NVE’s web site or from our authorized distributors. See

NVE’s web site for the list of authorized distributors.

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1

1

1

1

2

2

2

1

1

1

1

1

1

1

5

5

1

1

1

AG920-07 GT Sensor Evaluation Kit

This kit was created to facilitate laboratory experimentation and development using NVE’s GT

Sensor products. Because of the wide variety of mechanical orientations where these sensors can be used, this kit contains a large variety of circuit boards to simplify the customer’s fixturing and testing of the parts. Included in the kit are one of each type of

NVE’s GT Sensor products, both analog and digital, plus two of the DD001-12 signal processing ICs to convert the analog output of the ABL sensors digital.

Also included is a small container of solder paste with instructions on soldering to the TDFN-SO8 package. The contents are listed below:

Quantity Part Marking Description

AG913-06

AG916-06

AG917-06

AG911-06

AG912-06

12216

12217

N/A

N/A

N/A

ABL014-00

ABL015-00

AKL001-12

AKL002-12

DD001-12

AG915-06

AG914-06

AG918-06

AG919-06

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

FDD

FDF

P/N

P/N

P/N

N/A

N/A

N/A

N/A

Evaluation Kits

Dual Differential Sensor, 1.0mm Element Spacing,

0.5mm Phase Shift

Dual Differential Sensor, 0.5mm Element Spacing,

0.25mm Phase Shift

Digital Output Differential Sensor, 1.0mm Element

Spacing

Digital Output Differential Sensor, 0.5mm Element

Spacing

Digital Output Signal Processing IC for ABL Sensors

M8 Round PCB, for mounting ABL Sensor

M10 Round PCB, for mounting AKL Sensor

Long, Narrow PCB for Mounting ABL Sensor Parallel to

Long axis

Long, Narrow PCB for Mounting ABL Sensor

Perpendicular to Long axis

PCB for Mounting 2 DD001-12 ICs

Long, Narrow PCB for Mounting AKL Sensor

Perpendicular to Long axis

Long, Narrow PCB for Mounting AKL Sensor Parallel to

Long axis

Long, Narrow PCB for Mounting ABL Sensors Parallel to

Long axis, and 1 or 2 DD001-12 ICs

Long, Narrow PCB for Mounting ABL Sensors

Perpendicular to Long axis, and 1 or 2 DD001-12 ICs

6mm Diameter X 4mm Thick Round Ferrite Magnets

3.5mm Diameter X 4mm Thick Round Ferrite Magnets

Catalog and Application Notes on CD ROM

Small container of solder paste

Soldering Instruction Sheet and PCB Documentation

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