The KMA36 magnetic encoder's Anisotropic Magnetoresistive (AMR) technology determines accurately and contactless the magnetic angle of an external magnet over 360° with resolution up to 15 bit.
Universal contactless magnetic encoder for precise and reliable measurements. The KMA36 offers a sleep reduced power mode over I²C. In addition, programmable parameters give users access to a wide range of configuration options to provide the maximum of freedom and functionalities. Used both as a linear or a rotary position sensor, the KMA36 magnetic encoder IC has large air gap tolerance. The measurement is reliable over temperature ranges and insensitive to thermal stress. The maintenance-free operation and high bandwidth of this universal magnetic sensor make it a good choice for dynamic applications in harsh environments.
Q: What is a MR sensor?
A: A MR (Magneto resistance) sensor is an electrical component that changes electrical resistance when an external magnetic field is applied to it. Therefore, the magnetic field direction can be converted into an electrical signal to measure rotation, linear displacement or presence. MR sensors measure the angular orientation of the lines of magnetic flux which are independent of the field strength. For further knwoledge refer to our white paper Basics of Magnetoresistive (MR) sensors
Q: What is the difference between MR and Hall effect sensors?
A: MR sensors measure the magnetic field direction whereas Hall effect sensors are sensitive to magnetic field strength. This will enable a larger gap between sensor and magnet and lower sensitivity to gap variations induced noise.
Q: What are some of the benefits of using the KMA36 sensor?
A: These sensors can be used in very rugged environments and have a very long life. They are also not sensitive to temperature changes and can be used in fluids. Additionally, these components offer high resolution and built-in signal processing, providing I²C or PWM outputs (eliminates development time associated with signal processing / conversion of a typical sine / cosine output). These features make KMA36 and ideal sensor for quick IoT applications in Industrial or medical areas.
Q: What is the rotational measurement range?
A: The rotational measurement range of the KMA36 is 360° absolute or 180° periodically.
Q: Can the KMA36 be used as a linear absolute position sensor?
A: No, but it can be used as an incremental linear position sensor using a magnetic pole strip.
Q: Is the linear incremental measurement range unlimited?
A:No, the incremental counter has a size of 32Bit. This corresponds (assuming a pole strip with the referred 5mm pole pitch) to a maximum measurement range of approx. 13 km.
Q: Is the KMA36 sensitive to temperature changes?
A: A big advantage of the magnetoresistive sensor technology is that temperature effects are cancelled out to first order during signal calculation.
Q: What is the operating temperature range?
A:The range is -25°C to +85°C, making this sensor applicable for Industrial or Medical applications.
Q: What is the supply voltage range?
A: The supply voltage range is between 3.0 and 5.5VDC.
Q: What is the typical operating current?
A: The typical operating current depends on the configuration and ranges from 10mA to 30mA. If set into sleep mode the current consumption will drop to 1.2mA.
Q: When in sleep mode, what is the typical current?
A: This low power mode only consumes 1.2 mA typical. Especially for IoT applications where systems may be battery operated and low power consumption is important, the KMA36 can be a great choice.
Q: Does the KMA36 have an analog or digital output?
A: The KMA36 can provide the output data as PWM (semi-analog) or digital (I²C with a clock freq. of 100kHz) signal.
Q: What is the Data transfer rate (I²C)?
A: The bus transfer rate is up to 100 kHz.
Q: What is the package size?
A: The compact packaging sizes 6.5mm x 6.4mm x 1.2mm (TSSOP package) This component can be readily SMT processed in state of the art Industrial or Medical assembly facilities.
Q: Is the sensor affected by dirt/debris?
A: If the sensor is installed within an enclosure protected from an external environment and close enough to the magnet, it can operate in harsh applications such as dirt, oil and debris. Care should be taken when the debris contains magnetic particles.
Q: How are the KMA36 sensors supplied?
A: The KMA36 is available in Tube or via Tape & Reel (500pcs).
Q: Is a development board available?
A: Yes, TE supplies two types of evaluation boards (PMOD) and (GROVE) that can be found on TE.com. These boards will help a developer to set up quick applications fit for Industrial automation or IoT development