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
Contents
Section Title Page
1. AH54y Family Overview 3
2. Ordering Information 4
2.1 Marking Code 4
2.2 Operating Ambient Temperature Range 4
2.3 Hall Sensor Package Codes 4
3. Functional Description 4
4. Diagnostic Features 5
5. Specifications 6
5.1 Outline Dimensions 6
5.2 Pin assignment 8
5.3 Absolute Maximum Ratings 9
5.4 ESD and Latch-up 10
5.5 Recommended Operating Conditions 10
5.7 Magnetic Characteristics Overview 11
6. Application circui 12
6.1 2-Wire Devices 12
7. Data Sheet History 13
1. AH54y Family Overview
The types within each family differ according to the magnetic flux density values for the magnetic switching points, the temperature behavior of the magnetic switching points, the mode of switching, the number of pins and the average current consumption. Table 1 list some devices classified in terms of switching behavior and sensitivity: higher sensitivity correlates to lower switching points
Table 1: AH54y 2-wire device
|
Type Sensitivity |
Switching Behavior |
Sensitivity |
|
AH541 |
Latching |
Very high |
|
AH542 |
Latching |
Medium |
|
AH543 |
Unipolar inverted |
High |
|
AH544 |
Unipolar inverted |
Very high |
|
AH545 |
Unipolar |
Very high |
|
AH546 |
Uipolar |
High |
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.
