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Triaxis
The Sky's The Limit
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Triaxis General Description
What is Triaxis®?
Triaxis® is Melexis’ trademarked term to describe an innovative magnetic sensor technology capable of 3 axis magnetic field measurement from a single sensor. Via our Triaxis® technology we are able to measure the position of a magnet very precisely. It can be used to measure rotational, linear and 3D displacement as well as sense current flowing in a wire. It measures the properties of a magnetic field using the Hall Effect and innovative, patented, flux concentrators, known as "Integrated Magnetic Concentrators" or IMC.
Depositing a patented magnetic film to the surface of our IC and applying a specific mathematical formula to the resulting signals we can, with the same sensor, measure 3 components (x,y and z) of the applied magnetic flux density. Conventional Hall sensors (including devices like our MLX90215 Programmable Linear Hall Sensor) are only sensitive to flux in 1 axis, through the sensor.
Strengths of Triaxis®
Triaxis® sensors are small, capable of high temperature operation and can include sophisticated bus and interface electronics directly on chip. The magnetic coupling of the signal means no physical contact and no wear items for virtually infinite life. Also it means they are impervious to dirt, dust, moisture, grease and oil making them ideal for harsh environments in cars, trucks, farm equipment and industrial uses. Melexis patented Triaxis® scheme tolerates magnet misalignment further simplifying the design challenges of our customers. Being fully programmable our customers have the freedom to use practically any (inexpensive) magnet they prefer and can make many different sensors from one mechanical design simply by software changes. Also due to the fact that the Triaxis® sensors are “smart” sensors: they have self diagnostic features making them ideal in safety critical products like drive by wire and machine controls.
Where is Triaxis® used in?
Automotive
Steering angle, pedal position, electronic throttle body, ER valve, automatic shifter knob, turbo actuator, seat position, battery current monitoring, charge level indication, hybrid vehicle battery control systems.
Non-Automotive
Agricultural vehicles and equipment, joysticks, man-machine interfaces, heavy-duty vehicles, forklifts, robots, wheelchairs, industrial cranes, etc.
Triaxis Features and Benefits
- Triaxis® Magnetometer (BX, BY, BZ)
- On Chip Signal Processing for Robust Position Sensing
- High Speed Serial Interface (SPI compatible – Full Duplex)
- Enhanced Self-Diagnostics Features
- 5V and 3V3 Application Compatible
- Immune to dirt and dust
- Assembly Misalignment Tolerant
- Inexpensive magnet capability
- Single Die – SO8 Package RoHS Compliant
- Dual Die (Full Redundant) – TSSOP16 Package RoHS Compliant
Triaxis Environmental Information
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Triaxis Frequently asked Questions
MLX90316 Sensor Specs and Availability
Answer
MLX90316 is commercially available and you can get it through our sales network. If you want to know the nearest one from your location, please browse to the following link:
http://www.melexis.com/contact.asp
Please refer to the datasheet to get an overview of the working principle of this Triaxis IC:
http://www.melexis.com/prodmain.asp?search=mlx90316&family=MLX90316
If the Integrated Magneto Concentrator (IMC) is not saturated, it will not introduce any significant non-linearity error. However, if you saturate it, the output of the IC will show a large non-linearity error (the signature of this error is 4 periods over a full 360 degrees revolution).
The saturation starts above 70 mT. In other words, you need to make sure the magnetic flux density at the IC level is less than 70 mT to avoid saturation effect.
MLX90316 function description
Question
I've been asking myself , why the MLX90316 is called a TRIaxis Sensor.
To calculate the angle only Bx and By are used. So where's the third flux component ?
MLX90316
Question
what's the difference between the mlx90316 and the new mlx90333. i mean they use the same triaxis technology, right?!
which technology is used for production of these sensors, is it a cmos technology? cmos is mentioned in the data sheet, but which depth?
Answer
Correct, they use the same triaxis technology.
The technology is monolithic CMOS, 0.35 µ.
The difference between 90333 and 90316 is the firmware / software which run on the microcontroller, and therefore defines the behavior (or application) of the device.
90316 measures Bx & By to calculate one angle = Atan( By/Bx) , while 90333 measures Bx, By & Bz to calculate 2 angles.
MLX90333 triaxis 3D-Joystick Position Sensor
Question
I was trying to work with MLX90333 triaxis 3D-Joystick Position Sensor.I want to calibrate it for degree measurement. I looked through the datasheet and found the expression to calculte the degree i.e. alpha & Beta. I was wondering about how to find Vz in the expression because the sensor has only two outputs Vx & Vy.
General quesions for MLX90215
Answer
Not easily, the MLX90215 and 90251 are Linear Hall effect Sensors. Meaning their output is linearly proportional to the strength of the sensed magnetic field. Unfortunately to obtain a linear relationship between rotation and magnet field strength is technically challenging. Magnetic fields are not linear and need fairly complex magnetic pole pieces and magnetic circuits to create linear fields even over relative small rotational displacements. And many of the best ideas are covered with patents.
The MLX90316 is specifically designed to simplify this challenge. It uses Triaxis(Registered Trademark) technology to make it possible to use a simple disk magnet and achieve 360 degree rotational sensors. Through simple programming it can also do small rotational angles as well.
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