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05-19-2015

Infineon 3D Magnetic Sensor with High Accuracy Reduces Power Consumption in Consumer and Industrial Applications

Infineon » TLV493D-A1B6

 Infineon - TLV493D-A1B6Infineon Technologies announced its 3D magnetic sensor TLV493D-A1B6 that features highly accurate three-dimensional sensing with extremely low power consumption in a small 6-pin TSOP package. Magnetic field detection in x, y, and z direction, allow the sensor to reliably measure three-dimensional, linear and rotation movements. The implemented digital I2C interface enables fast and bidirectional communication between sensor and microcontroller.

The TLV493D-A1B6 suits consumer and industrial applications that require accurate three-dimensional measurements or angular measurements or low power consumption, such as joysticks; control elements used for white goods and multi-function knobs; and electric meters where the 3D magnetic sensor helps to protect against tampering. With its contactless position sensing and high temperature stability of magnetic threshold, the TLV493D-A1B6 enables these systems to become smaller, more accurate and robust.

“Our TLV493D-A1B6 enables magnetic sensing to applications which have not been considered so far by making them smaller, more accurate and robust,” said Ralf Bornefeld, Vice President and General Manager, Sense & Control, Infineon Technologies AG. “Our TLV493D-A1B6 marks the starting point for a new 3D magnetic sensor family. Later this year, we will offer a 3D sensor for automotive applications such as gear sticks and steering column controls.”

 Infineon - TLV493D-A1B6

The 3D magnetic sensor TLV493D-A1B6 enables smaller and more energy efficient e-meter systems. Today, up to three magnetic sensors – one for each dimension of external magnetic field – are needed to measure tampering attempts with large magnets. In future, the 3D magnetic sensor TLV493D-A1B6 replaces all three dimension sensors thus making e-meters smaller and more energy efficient.

Technical details of TLV493D-A1B6

The 3D sensor TLV493D-A1B6 detects all three dimensions of a magnetic field. Using lateral hall plates for the z direction and vertical Hall plates for the x and y direction of the magnetic field, the sensor can be used in a large magnetic field range of ±150 mT (milli Tesla) for all three dimensions. This allows measuring and covering a long magnet movement. The large operation scale also makes the magnet circuit design easy, robust and flexible.

The TLV493D-A1B6 provides 12-bit data resolution for each measurement direction. This allows a high data resolution of 0.098 mT per bit (LSB) so that even the smallest magnet movements can be measured.

One of the main development goals for the TLV493D-A1B6 sensor was low power consumption. In “Power Down mode,” the sensor only requires 7 nano Ampere supply current. To perform magnetic measurements, the sensor can be set in one of five different power modes. In “Ultra Low Power Mode,” for example, the sensor performs a magnetic measurement every 100 milliseconds (10 Hz) resulting in a current consumption of 10 µAmpere. The time between measurement cycles can be set flexibly allowing system specific solutions. Using the sensor with continuous measurements, the maximum power consumption is only 3.7 mAmpere. Also, the power modes can be changed during operation.

The TLV493D-A1B6 Block Diagram
The TLV493D-A1B6 Block Diagram.

The TLV493D-A1B6 uses a standard I2C digital protocol to communicate with external microcontrollers. It is possible to operate the sensors in a bus mode to eliminate additional wiring cost and efforts.

Targeting industrial and consumer applications, TLV493D-A1B6 can be operated on supply voltages between 2.7 Volt and 3.5 Volt and in a temperature range between –40°C to 125°C. The product is qualified according to industry norm JESD47.

Development support

To enable a fast design-in process, Infineon offers the evaluation board “3D Magnetic 2Go.” In combination with the free 3D sensor software, first magnetic measurements are attainable within minutes. The evaluation board applies the Infineon 32-bit microcontroller XMC1100 that uses the ARM® Cortex®-M0 processor.

 3D Magnetic Sensor 2 Go Kit with TLV493D-A1B6
3D Magnetic Sensor 2 Go Kit with TLV493D-A1B6.

Availability

Engineering samples of the TLV493D-A1B6 designed for consumer and industrial applicationsare available as of July 2015. Volume production is expected to start in January 2016. To serve customers in the automotive market, Infineon will conduct a full AEC-Q100 qualification on the sensor. Volume production for the automotive qualified TLE493D-A1B6 is expected for mid of 2016.

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