Crocus technology improves the accuracy of energy measurement solutions

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TMR sensor reference design with digital output simplifies implementation

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MILPITAS, Calif., May 24, 2022 (GLOBE NEWSWIRE) — Crocus Technology Inc., developer of XtremeSense® TMR sensors, today announced the release of a high-accuracy energy measurement solution with isolated current sensing and output digital. The solution is able to measure power, voltage and current while providing 1820VPACK insulation in AC or DC applications. The result is a smaller, more efficient design without the use of large current transformers. The solution is ideal for a range of smart devices such as power monitors, electric vehicle chargers, home appliances, motor control and smart lighting.

The solution consists of Crocus’ CT430 TMR isolated current sensor, Microchip’s ATtiny426 microcontroller, printed circuit board (PCB), design files, microcontroller firmware, BOM list ( BoM), a user guide and relevant support for designing a fully functional power monitoring. Solution. The design solution has been verified to accurately read and quantify voltage and current values ​​before calculating instantaneous and rms power components, active and reactive power, and power factor. These power values ​​are stored in registers accessible by an external microcontroller via the SPI interface. By offloading the effort of metering design and power calculation, the Crocus metering solution makes it easy to add metering capabilities to any smart device.

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The key to accurate power measurements is the CT430 current sensor which provides better than 1% current measurement accuracy over the -40°C to +125°C operating range. It is available in a small 16-pin SOIC-Wide package, eliminating the need for bulky current transformers and enabling more compact designs. The CT430 solution can also be customized with different bus interfaces such as I2C, SENT and CAN. By leveraging the solution, manufacturers and designers can rapidly develop accurate and compact power monitoring capabilities for their products. See the figure below for the system diagram of the Crocus Reference Design Kit for Power Measurements.

“Being able to accurately measure power and communicate that data within a system continues to be a challenge for designers,” said Tim Kaske Crocus, vice president, sales and marketing. “The Crocus solution with the CT430 current sensor offers improved accuracy over existing designs based on magnetic sensors. With a validated design solution and a 12-week lead time, OEM design customers are able to quickly integrate the energy measurement solution into their end products.

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The design files needed to fabricate or customize this power meter PCB are available for download.

The AN136 CT430 Power Measurement Module User Guide is also available for download, Module-Rev0.0. pdf.

About Crocus Technology

Crocus Technology develops and manufactures state-of-the-art magnetic sensors based on its patented XtremeSense® TMR sensor technology. Crocus’ disruptive magnetic sensor technology brings significant advancements to IoT and smart devices, industrial, consumer electronics, medical and automotive applications requiring high accuracy, high resolution, stable temperature performance and low power consumption. of energy. Crocus is headquartered in Milpitas, California. To learn more about Crocus Technology and its leading TMR technology, please visit

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Crocus Technology

A photo accompanying this announcement is available at



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