Magnetic sensing IC integrates fluxgate sensor
Texas Instruments has introduced the industry’s first magnetic sensing IC with a fully integrated fluxgate sensor and compensation coil driver, along with all of the required signal conditioning circuitry. Complete integration enables the DRV421 to provide outstanding sensor accuracy and linearity, high dynamic range and simpler system design compared to traditional closed-loop sensors.
With the IC, system designers will be able to more easily develop magnetic closed-loop current sensors for applications such as motor control, renewable energy, battery chargers and power monitoring.
The integrated fluxgate sensor reduces design complexity and design effort, and helps achieve smaller footprint. This integration allows precise control over motors and automation equipment with an overall sensor accuracy of less than 0.1%. The integration also reduces coupling between the compensation coil and the fluxgate sensor, as well as emissions from fluxgate excitation, providing high linearity. Built-in closed-loop magnetic core degaussing procedure and offset calibration increase dynamic range up to six decades while supporting higher system-level accuracy, compared to traditional solutions. As the first fluxgate sensor solution on the market supporting 3.3-V operation, the DRV421 simplifies the interface to integrated ADCs on low-power MCUs.
The DRV421 comes in a 4x4mm QFN package. Pre-production samples are available now. Production quantities will be available in 3Q2015 for a price of $2.50 in 1,000-unit quantities.
The DRV421 evaluation module (DRV421EVM) enables designers to quickly and easily evaluate the current sensing IC’s features and performance. It is available for purchase for $49 via the TI store and authorised distributors.
Support for the DRV421 is available in the TI E2E Community, where engineers can search for solutions, get help, share knowledge and solve problems with fellow engineers and TI experts.
In addition, SUMIDA CORPORATION has introduced the SC2912, a magnetic module that system designers can place on top of the DRV421 as a PCB component. This allows engineers to design universal platform solutions targeting a wide range of current levels while choosing the appropriate magnetic module for their specific use case.
“The novel and intuitive approach of our DRV421 complementary module gives customers a new degree of freedom for a closed-loop sensor module,” said Mr. Seiji Shimizu, Assistant Manager of signal and power solutions, Automotive and Industry Business Unit, SUMIDA. “The combination of our module technology and TI’s DRV421 gives customers an unprecedented level of accuracy, linearity, dynamic range, sensitivity and ease of use.”
TI is demonstrating this technology in booth 217 at the Sensors Expo from 9th to 11th June in Long Beach, California.
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