Unipolar Magnetic Sensors

Introduction

AH54y family consists of different Hall switches produced in BCDMOS technology. All Hall sensors include a temperature-compensated Hall plate with active offset compensation, a comparator, and an output driver. The family consists of 2-wire devices, the corresponding output driver being an open-drain output transistor and a current source respectively. The comparator compares the actual magnetic flux with the fixed reference values (switching  points).  Accordingly  the  output  transistor  in  the  current  source  is  switched  on  (high  current consumption) or off (low current consumption) in 2-wire version. The active offset compensation leads to constant  magnetic  characteristics  over  supply  voltage  and  temperature  range.  In  addition,  the  magnetic parameters are robust against mechanical stress effects.

The sensors are designed for industrial and automotive applications and operate with supply voltages from3V to 30V in ambient temperature range from -40 °C up to 150 °C.

The family AH54y is available in SOT23-3L and the leaded version TO92S packages.

Features

 SOT23-3L and TO92S packages
 Low current consumptions of typ. 2.5 mA
 Operates from3V to 30 V supply voltage
 Overvoltage protection capability up to 40 V
 Highest ESD performance up to ±12 kV
 Current output for 2-wire applications
 Magnetic   characteristics   are   robust   regarding mechanical stress effects
 Constant  switching  points  over  a  wide  supply voltage and temperature range
 Wide operating temperature range from    -40 °C to 150 °C
 The decrease of magnetic flux density caused by rising   temperature   in   the   sensor   system   is compensated by a built-in negative temperature coefficient of the magnetic characteristics
 Reverse-voltage protection at Vcc pin
 Ideal sensor for applications in extreme automotive and industrial environments
 Qualified according to AEC-Q100 test standard for automotive  electronics industry to provide the highest quality expectation

Applications
 Speed and RPM sensing
 Tachometer, counter pickup
 Flow-rate sensing
 Brushless dc motor commutation
 Motor and fan control
 Robotics control
 Proximity sensor
 Position sensor
 Seat position detection
 Seat belt buckles
 Hood/trunk/door latches
 Sun roof/convertible top/tailgate/liftgate actuation
 Brake/clutch pedals
 Electric power steering (EPS)
 Transmissions and shift selectors
 Wiper motor 

Package

SOT23-3L             TO92

7.                         Data Sheet History                                                                    13

1.   AH54y Family Overview

The following definitions outline the device behavior for different switching points:

Latching Sensors:

2-wire: The output turns low with the magnetic south pole on the branded side of the package and turns high with the magnetic north pole on the branded side.

The output does not change if the magnetic field is removed. For changing the output state, the opposite magnetic field polarity must be applied.

Fig. 1: Definition of magnetic switching points for 3- wire latching sensor.

Introduction

AH50y family consists of different Hall switches produced in BCDMOS technology. All Hall sensors include a temperature-compensated Hall plate with active offset compensation, a comparator, and an output driver. The family consists of 3-wire devices, the corresponding output driver being an open-drain output transistor and a current source respectively. The comparator compares the actual magnetic flux with the fixed reference values (switching points). Accordingly the output transistor is switched on or off in 3-wire version. The active offset compensation  leads  to  constant  magnetic  characteristics  over  supply  voltage  and  temperature  range.  In addition, the magnetic parameters are robust against mechanical stress effects.

The sensors are designed for industrial and automotive applications and operate with supply voltages from 2.7 V to 30V in ambient temperature range from -40 °C up to 150 °C.

The family AH50y is available in SOT23-3L and the leaded version TO92S packages.

Features

 SOT23-3L and TO92S packages
 Low current consumptions of typ. 2.5 mA
 Operates from 2.7 V to 30 V supply voltage
 Overvoltage protection capability up to 40 V
 Highest ESD performance up to ±12 kV
 Short-circuit   protected   open-drain   output   and thermal shut down for 3-wire applications
 Magnetic   characteristics   are   robust   regarding mechanical stress effects
 Constant  switching  points  over  a  wide  supply voltage and temperature range
 Wide operating temperature range from    -40 °C to 150 °C
 The decrease of magnetic flux density caused by rising   temperature   in   the   sensor   system   is compensated by a built-in negative temperature coefficient of the magnetic characteristics
 Reverse-voltage protection at Vcc pin
 Ideal sensor for applications in extreme automotive and industrial environments
 Qualified according to AEC-Q100 test standard for automotive  electronics  industry  to  provide  the highest quality expectation
 
Applications

 Speed and RPM sensing
 Tachometer, counter pickup
 Flow-rate sensing
 Brushless dc motor commutation
 Motor and fan control
 Robotics control
 Proximity sensor
 Position sensor
 Seat position detection
 Seat belt buckles
 Hood/trunk/door latches
 Sun roof/convertible top/tailgate/liftgate actuation
 Brake/clutch pedals
 Electric power steering (EPS)
 Transmissions and shift selectors
 Wiper motor

Package

SOT23-3L          TO92

Contents

Section
 

Title
 

Page
 

SECTION        Title                                         Page
1.              AH50y Family Overview                     3
2.             Ordering Information                          5 
2.1            Marking Code                                    6
2.2    Operating Ambient Temperature Range       6
2.3    Hall Sensor Package Codes                        6
3.      Functional Description                               6
4.      Diagnostic Features                                   7
5.      Specifications                                            8
5.1     Outline Dimensions                                    8
5.2     Pin assignment                                         10
5.3     Absolute Maximum Ratings                        10
5.4     ESD and Latch-up                                     11
5.5     Recommended Operating Conditions           11
5.6     Characteristics                                          12
5.7     Magnetic Characteristics Overview              13
6.      Magnetoelecric conversion characteristics    13
7.      Application circui                                        14
8.      Data Sheet History                                      15
 

1.   AH5xy Family Overview

Introduction

AH431, designed with Bipolar technology, includes on-chip Hall element voltage generator, a voltage regulator  for  operation  with  supply  voltages  of  3.8  to  60V,  temperature  compensation  circuitry, small-signal amplifier, Schmitt trigger and a switch controlled current source circuit.

The sensor is a 2-wire device designed to respond to South poles , the    output driver being    a current

source. The comparator compares the actual magnetic flux with the fixed reference values (switching points). The current source is switched on (high current consumption) or off (low current consumption) . The active offset compensation leads to constant magnetic characteristics over supply voltage and temperature range.

AH431 offers a variety of packages, including TO-92S, SOT-23. All packages are RoHS compliant.

Features
Digital current output

Miniature construction

High sensitivity of   85/60Gauss   (typ.)

Wide voltage range of 3.8 Vdc to 60 Vdc

Highest ESD performance up to ±6 kV

Temperature range of -40 °C to 125 °C

Applications
BLDC Motor Commutation

Flow sensor

Position sensor

Speed sensor

Proximity sensor

Package

1.Introduction

AH422, unipolar Hall effect switch, designed with Bipolar technology, is south sensitive unipolar Hall Effective switch and includes on-chip Hall element voltage generator, a voltage regulator for operation with supply voltages of 3.5 to 40V, temperature compensation circuitry, small-signal amplifier, Schmitt trigger and an open-collector output.

The sensor is designed to respond to South poles. While the magnetic flux density(B) is larger than operate point Bop,   the output will be turned on with low output level. Then the output is held until the magnetic flux (B) is lower than release point Brp. The output will be turned off with high output level.

AH422 offers a variety of packages, including TO-92, SOT-23. All packages are RoHS compliant.
 

2.Features
Miniature construction

High sensitivity of 30/20Gauss   (typ.)

Wide voltage range of 3.5 Vdc to 40 Vdc

Temperature range of -40 °C to125 °C

Highest ESD performance up to ±4 kV

Open Collector Output

3.Applications
BLDC Motor Commutation

Flow sensor

Position sensor

Speed sensor

Proximity sensor

4.Package

5.Ordering information

1.Introduction

AH421, unipolar Hall effect switch, designed with Bipolar technology, is south sensitive unipolar Hall Effective switch and includes on-chip Hall element voltage generator, a voltage regulator for operation with supply voltages of 3.5 to 40V, temperature compensation circuitry, small-signal amplifier, Schmitt trigger and an open-collector output.

The sensor is designed to respond to South poles. While the magnetic flux density(B) is larger than operate point Bop,   the output will be turned on with low output level. Then the output is held until the magnetic flux (B) is lower than release point Brp. The output will be turned off with high output level.

AH421 offers a variety of packages, including TO-92, SOT-23. All packages are RoHS compliant
 

2.Features
 Miniature construction

 High sensitivity of 60/40 Gauss   (typ.)

 Wide voltage range of 3.5 Vdc to 40 Vdc

 Temperature range of -40 °C to 125 °C

 Highest ESD performance up to ±4 kV

 Open Collector Output

3. Applications
 BLDC Motor Commutation

 Flow sensor

 Position sensor

 Speed sensor

 Proximity sensor
4.Package

5.Ordering information