Linear Hall Effect Sensor 49e Oh49e Ss49e Hall Element

Description:

The SS49E Linear Hall-effect sensor is a compact and versatile device that operates with the magnetic field of a permanent magnet or an electromagnet. It delivers a linear sourcing output voltage determined by the supply voltage, and the output changes directly in proportion to the strength of the magnetic field.The integrated circuitry features low noise output, which makes it unnecessary to use external filtering.

Typical Applications:

• Motor control
• Magnetic code reading
• Ferrous metal detector
• Current sensing
• Position sensing

Package Include:

1 x  LINEAR HALL EFFECT SENSOR 49E OH49E SS49E HALL ELEMENT

KEY FEATURES OF HALL-EFFECT SENSOR ANALOG 49E:

• Senses relative strength of magnetic field and provides analog voltage output
• Can differentiate between North and South pole of magnet
• 3.3 and 5V compatible

Hall-effect sensors are commonly used for measuring the speed of rotating assemblies where a magnet on the assembly alternately makes and breaks magnetic contact with the sensor as the assembly rotates.  They can also be used for applications such as determining when a door has been opened, position sensing and detecting the magnetic field created by current flow in a wire               

The 49E sensor can detect both the North and South pole of a magnet as well as the relative strength of the magnetic field.  The side of the sensor with the labeling is the side used for detection.

Hall-effect sensors have several advantages over mechanic switches, chief among them are that by being solid-state, there is no concern about contacts wearing out and the switching speed can be quite high.

The main challenge with using Hall-effect sensors usually resides around the mounting of the sensor and any associated magnets.

Power Supply

The sensor can operate over a Vcc range of 2.3-10V.

If an MCU reads the output, you should operate the sensor at the same voltage as the MCU. This approach ensures the sensor output stays compatible with the analog input range.

The sensor typically draws 4mA, but the current varies with Vcc. For instance, at 3.3V it draws about 5mA, while at 5V it consumes around 7.8mA. Moreover, you can even power the device directly from an MCU digital output pin.

Analog Output

The sensor outputs an analog voltage. When it detects no magnetic field, the output rests at approximately half of Vcc. If you bring the south pole of a magnet close, the output ramps linearly upward toward Vcc. On the other hand, if you move the north pole near, the output ramps linearly downward toward ground.

For example, when Vcc is 5V and no magnetic field is present, the output stays around 2.5V. As soon as the south pole comes closer, the output rises linearly to a maximum of about 4.2V. Conversely, if the north pole approaches, the output drops linearly to a minimum of about 1.0V.

OUR EVALUATION RESULTS:

Hall-effect sensors are quite useful in a number of applications and one of the more under utilized electronic components available to hobbyists.  These particular sensors are used in many of the analog hall effect sensor modules that come out of China.

The program below monitors the output of the sensor and reports the value of the analog output.  Simply hook the sensor up to 5V / 3.3V and ground and connect the sensor output pin to a analog pin on the MCU.  We use pin A0 in this example but this can be any analog input pin.