In view of this, existing manufacturers are now launching various design kits, the price of which is approximately 20 euros per piece, which helps to easily evaluate the sensor. Developers must determine whether the selected sensor can meet the performance requirements in the early stages of design. To achieve this goal, they need a faster and simpler performance test. The next step is to define operating ranges for different design parameters. The necessary magnets also need to be operational. The final step is to ensure that the sensors can actually be put into production. Various evaluation kits such as English Infineon's "3D Magnetic Sensor 2Go", "Current Sensor 2Go" and "Speed Sensor 2Go" are designed to enable developers to understand the individual applications of the sensor at the beginning of the design time and to help them easily enter the design time. The company's evaluation kit currently supports 3D "TLV493D" magnetic sensor for 3D position detection, and "TLI4970" current sensor, "TLE4922" speed sensor.
Three-dimensional sensing is more accurate
The TLV493D 3D magnetic sensor (Figure 1) measures magnetic fields in the x, y and z directions and detects three-dimensional, linear and rotational motions, demonstrating its wide range of applications covering automotive, industrial and consumer applications.
Figure 1. The Infineon TLV493D 3D sensor provides highly accurate 3D sensing.
Possible applications include joysticks and control components such as home appliances and multifunction buttons, tamper proof ammeters, or other applications that require precise position measurement and/or low current consumption. For example, the TLV493D-A1B6 is available in TSOP-6 package Dimensions are 2.9mm x 1.6mm.
This is done by integrating the vertical and horizontal Hall sensors on the sensor chip. The vertical Hall sensor detects the x and y field components in the plane direction, and the horizontal Hall sensor detects the vertical z field components.
Infineon uses various technologies including power saving oscillators to reduce the current consumption of the sensor to only a few microamperes. The sensor has a digital output function, using a fast two-wire I2C standard interface, through the bus mode in the sensor And two-way communication between microcontrollers.
The "3D Magnetic Sensor 2Go" design kit (Figure 2) provides an evaluation board with a 3D magnetic sensor and an XMC1000 microcontroller with an ARM Cortex-M0 processor to integrate the design into this sensor. The kit has all the components and functions , Enough to provide efficient design support, and includes a debugger. The XMC4200 microcontroller also provides debug and USB communication, and provides power and communication with a graphical user interface (GUI) through the Micro USB connector. The board also contains LEDs that show power and debug status, user-programmable LEDs, voltage controllers, reverse-current diodes, and ESD protection diodes. If you use a pin connector, you can also connect an oscilloscope or an external microcontroller.
The package also contains a single magnet that can be manually configured. Infineon also offers a magnet mount that can be mounted on the evaluation board. Figure 2 shows two designs for the joystick and knob.
Figure 2 3D Magnetic Sensor 2Go Kit Magnet Holder with Adaptor or Knob (Adapter)
Special online design tools support common sensor applications such as angle/linear position measurement and joystick (Figure 3). This tool provides pre-defined or user-definable magnets for each of the three applications. The magnets can be defined using online simulation tools. And sensor position. The sensor detects the motion and outputs the corresponding signal. The user can select the angle measurement motion, such as magnet rotation, linear motion, also includes specific actions applied by the joystick, such as 3D magnet motion.
Figure 3 Online simulation tool can be used to define the magnet, magnet movement and 3D sensor position.
This tool automatically calculates three magnetic field directions for each sensor position. This calculation is based on a user-defined sensor configuration and takes into account the mounting tolerances of the sensor and magnet.
The software package of the kit also includes a graphical user interface for the PC and the firmware, which can be stored in the communication flash memory and installed on the microcontroller together with the 3D sensor. The Segger J-Link USB driver connects the evaluation board and the PC.
With 3D Magnetic Sensor 2Go, various operating modes such as x, y, and z direction measurement update rates can be adjusted, which also means that current consumption can also be adjusted.
Current measurement safety protection is indispensable
The TLI4970 is a high-accuracy current sensor based on Infineon's Hall-effect technology and provides galvanic isolation between the primary-side bus and the secondary-microcontroller interface (Figure 4). The "coreless" concept has no flux concentrators. In the open loop configuration, the component size can be greatly reduced, and this structure can also avoid the hysteresis effect. The all-digital sensor solution does not require external calibration or additional components such as AD converters, operational amplifiers, voltage references, etc. Designed to reduce PCB area and cost. The chip uses a QFN-like compact SMD package (7.0mm x 7.0mm), providing 1.6% over-temperature and high-accuracy life sensing, and up to 75mA offset error.
Figure 4 Infineon TLI4970 Hall Current Sensor Structure
The TLI4970 has overcurrent detection and can set thresholds and programmable filters by itself. The current consumption is 12mA. The differential measurement principle of the TLI4970 prevents external magnetic fields from causing interference, while the sensor uses a separate structure to measure temperature and machinery. pressure.
The above two parameters are measured separately during operation, so that the components can be permanently and effectively shifted. This is the basis for long-term stable measurements and is also suitable for efficient, reliable, cost-optimized converters or actuators. The TLI4970 can measure up to +/-50A AC and DC power, suitable devices such as solar power converters, power supply with power factor correction (PFC), charger or electronic driver, etc. Non-contact measurement technology will not generate any extra loss, suitable for low power designs (Rp<0.6mΩ). 由于采用整合式离散磁场抑制, 此款传感器对于外部磁场极不敏感.
In addition to providing accurate current measurements, it also provides sufficient protection for power amplifiers, etc. For example, an external short circuit can trigger critical overcurrents. To ensure extremely short delays, the TLI4970 provides parallel signal paths, so the sensor typically requires only 1.8 Μs to detect errors. To fine-tune the over-current threshold according to the needs of the application, the system developer can program the current and the downstream filter in the sensor at the same time. Since the bus is integrated into the SMD package, the sensor can be fully calibrated when provided. The TLI4970 is one of the first current sensors to transmit measurement values via the 16-bit digital SPI interface. For example, this sensor incorporates differential amplifiers, filters and signal processing functions, and can measure up to 600V simultaneously during galvanic isolation. Operating voltage and test voltage up to 3,600V.
The easy-to-use design kit for the TLI4970 current sensor and the Current Sensor 2GO (Figure 5) is similar to the 3D Sensor 2GO kit and includes the following features:
Figure 5 Current Sensor 2Go Kit
1. TLI4970-D050T4 (current sensor with digital interface)
2.XMC1100 (equipped with ARM Cortex-M0)
3. Built-in J-Link Lite debugger (based on XMC4200 microcontroller)
4.USB Power Supply (MicroUSB), ESD Reverse Current Protection
5.GUI
Hall sensor precision speed
The TLE4922 Hall sensor can detect the movement and position of the ferromagnetic structure by measuring the magnetic field change. This structure can be a magnetic encoder wheel or a ferromagnetic gear. The TLE4922 can be configured using a feedback bias to use a simple type. Cost-effective magnet, with high air gap performance and switching accuracy. This sensor is extremely insensitive to shock and air gap jumps and can accurately detect speeds up to 8kHz.
The TLE4922 is especially suited for rotating stand-alone (TIM) configurations and replaces passive variable reluctance (VR) sensors in automotive and two-wheeler applications, with excellent jitter behavior.
In addition, the sensor provides full protection against short circuits, overheating, and reverse voltages, along with good electromagnetic compatibility (EMC) and ESD robustness, and is suitable for use in harsh environments. This sensor uses 4-pin SSO- 4-1 package.
Various applications based on TLE4922 can use the easy-to-use Speed-Sensor-2GO kit (Fig. 6). This kit contains the sensor (TLE4922-XAN) and feedback bias magnet (Bomatec ferrite magnet). PC can be Easily connect using the USB connector. When using the GUI type evaluation tool for practical applications, digital and simulated analog data can be retrieved and displayed as parameter functions such as air gap, temperature, and frequency.
Figure 6 Speed Sensor 2Go Kit
The kit uses the TLE4922, which can be internally connected to supplied modules or other modules assembled by the customer. It can also be used as a graphics tool for handling magnetic fields. The internal architecture corresponds to a linear Hall sensor. The developer can use the TLE4922 to evaluate the module positioning of the gears.
Infineon addition to providing a 3D position detection, current, speed design kit, the future will provide suitable angle sensor similar assessment solutions, and to complete file and Arduino Shield provides design support. There are also online simulation tool for different types of applications to help select the product after the user selects an application can use various magnetic sensor parameters and perform calculations to simulate a magnetic field. in addition, the tool may be a magnet and the optimum gap according to the residual magnetism is determined. As the angle Sensors, online tools can determine the maximum angle error according to assembly tolerances.