Infineon's Compact 3D Hall Magnetic Sensor

Infineon’s highly accurate and compact 3D magnet sensor allows you to make your automotive applications, control elements, e-meters and other technologies more reliable.

Welcome to this presentation of our 3D Magnetic Hall Sensor TLV493D. When the sensor was designed, it was designed with two intentions, with two purposes. Low cost, high accuracy and small physical size. And we'll see that as we go through this presentation.

My name is Hector Moreno, I'm an Applications Engineer for Infineon Technologies. So what are the target applications for our 3D Sensor? Industrial controls, as you can see there a joystick. Control elements for white goods. Anti-tampering meters for E-meters where people tend to apply extraneous fields, magnetic fields to try to skew the measurement, can be detected with our 3D sensor. Or for automotive, we can use it to detect the position of the gear stick as you can see here.

Many applications are possible only limited by our imagination. Traditional solutions, in the past for example joysticks used to be made with potentiometers analog measurement with a limited time expectancy because of the friction inside of the potentiometers. What's our solution? A single 3D sensor.

Lower cost, much higher reliability because there's no mechanical contact there's no contact, no physical contact between the part that you're sensing and the actual sensor. Take for example the gear stick sensing. Currently we use a bunch of Hall Switches, up to six. In fact in an actual application we used 12, two for redundancy, two for each position.

As the gear shift pivots around the fulcrum, we detect the position of the magnet and we can tell what speed is the transmission on. That requires a lot of Hall Switches, you can see here six but in reality it's about 12 for safety. With our solution, you can go down to two sensors.

If you want to measure true X, Y, Z, measurements it requires two sensors for the X, Y and one for the Z sensor meaning you will need a daughter board. Our solution: single 3D sensor, lower cost, higher reliability. Take a look at the package, it's in a PG-TSOP6 package. Very small dimensions, 2.9 millimeters by 2.5 millimeters. It can fit a lot of them in one finger. Very small physical dimensions.

You can make measurements of the magnetic field strength in the linear way or you can do it for rotational movement such as push knob, you know turn knob where you can push it. Or you can use it for a joystick movement. How can we do this? Because we're using our Trench technology for the whole plate in the C direction. We can measure true X, Y signals and on top of that we also have a temperature sensor inside that you can use to calibrate the measure and improve the accuracy of the measurement.

One of the key features of this part is a low power consumption. This part was designed to keep the power consumption as minimum. When the part is making a measurement it's drawing 3.7 milliamps from your power supply. And when it goes to the power down mode, it's only drawing 7 milliamps. So depending on how often you make the measurements, what's your update rate, that determines the power consumption that the part will have.

You can see here for example, in power down mode you're only drawing 7 nanoamps from the battery. Ultra low power if your update rate is 10 hertz, is only 10 microamps. Or you can go to the fast mode where you're always making measurements the power consumption will be 3.7 milliamps. And this is all configurable by the user. You dictate how often you want to trigger a measurement.

Now the other key feature, and this is one of the most important ones it's a cost optimized design. This is a new price level for magnetic 3D sensors. This part is cheaper than three Hall Sensors separate. So you can make a much more robust design with this one than having a discrete solution and at a lower cost.

What are the product details? 12 BIT resolution, this means you can measure very small magnetic changes. Up to plus or minus 150 millitesla of flux density and more importantly, you can put the part to sleep and have it wake up only when there's been a change in the magnetic field. The interface of the micro controller is a very known I square C protocol. It's very fast and accurate and it allows Bus Mode possible if you want to interface to more than one device.

How do you get this device in case you're interested? Well, we have a 3D Magnetic To-go evaluation board. You can hook up this sensor to your personal computer via USB link by downloading the software. You can make measurements within minutes with this part. The tip, as you can see, the sensor is mounted on the tip. You can tear it off, make connections, place the sensor wherever you need it and make your magnetic measurements very quickly and very fast.

The sensor comes with a magnet or a joystick that you can order to make very fast initial evaluation of the sensor. That's all for support with simulation and selection tools. If you go to our magnetic sensors website you click on Hull Switches and you open the Sensor Desk.

What is this? This is a tool that enables you to simulate actual conditions. You plug in, you don't have to know the part number, you don't have to know the Infineon specific part number or to know our portfolio to get the right part. The tool will select the part for you providing you an output, a simulation that includes a part recommendation and a visual representation of the simulated operation.


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