Allegro: sensorless sinusoidal three-phase gate controller

Allegro MicroSystems Europe has introduced the release of a three-phase, sensorless, brushless DC motor controller for use with external N-channel power MOSFETs.  Allegro’s A4964 is specifically designed for the automotive market with target applications to include engine cooling fans and oil and water pumps.  It is designed to provide the motor control functions in a system where a small microcontroller provides the communication interface to a central ECU and intelligent fault and status handling.  The A4964 provides the supply and watchdog for the microcontroller and the high-voltage interfaces between the microcontroller and the central ECU and ignition switch.  It can also operate as an independent single chip remote motor controller.

The motor is driven using a three-phase sinusoidal current drive where phase commutation is determined, without the need for independent position sensors, by monitoring the motor back-EMF (bemf).  The sensorless start-up scheme includes forward and reverse pre-rotation (windmill) detection and synchronization, and allows the device to operate over a wide range of motor and load combinations.

The A4964 offers three control modes, open loop (voltage) control, current (torque limit) control, and closed-loop speed control which allows it to be used in a wide range of applications.  Control mode, operating mode, and bridge parameters are programmed through an SPI-compatible serial interface.  A single current sense amplifier provides peak current limiting and average current measurement through the serial interface.  Integrated diagnostics provide indication of under-voltage, over-temperature, and power bridge faults and can protect the power switches under most short-circuit conditions. The A4964 is provided in both a 36-terminal QFN and a 32-lead QFP package, both with exposed thermal pad for enhanced power dissipation.


WSI's OLED Professional innovations create more value for You.

WSI are the PMOLED manufacturer and our factory located in Chun-Nan in Taiwan. Our products are the market leader and pioneer in PMOLED module, including the monochrome, area colors and full color one...


SKIPPER UBT21 - a Bluetooth 4.0 USB serial adapter for industrial and medical use

SKIPPER UBT21 is a Bluetooth 4.0 USB serial adapter for industrial and medical use. It incorporates a Bluetooth Dual-Mode Stack, supports ranges of up to 300 meters and transferrates of 720 kbit/s (ne...


Three of a kind - Versatility based on Low Power ARM Cortex-A15

At this year's Embedded World, MEN has presented three low power, ARM Cortex-A15-based solutions on different form factors: a VMEbus SBC, an industrial box PC and a COM Express Mini module. All so...


Enabling Embedded IoT

Eurotech, a long-time leading provider of embedded systems and a global leader in IoT enablement, showed its new modules and Multi-service IoT Gateways at Embedded World 2017. The newly introduced Eu...


PLS’ UDE and new UAD2next allow more powerful trace analysis of embedded multicore systems

The new Universal Debug Engine 4.8 from PLS Development Tools offers a bunch of new and improved features for trace analysis of embedded multicore systems. With the new access device UAD2next PLS cont...


Disruptive technologies

Rahman Jamal, Global Technology & Marketing Director, National Instruments, talks about disruptive technologies in the consumer world, but also in measurement, automation, and the embedded industr...


AdaCore Announces Availability of QGen Debugger at Embedded World 2017

Jose Ruiz, technical lead at AdaCore for the company's QGen automatic code generator toolset for model-based development, discusses that product and explains what differentiates it from other prod...


SECO IoT roadmap: from the proof of concept to the market

During Embedded World 2017 Gianluca Venere, SECO Director of Global Sales, leads us to discover the company's Industrial IoT roadmap showcased at SECO's main booth, along with the latest UDOO ...


Internet of Chocolate

HCC show off an embedded chocolate vending machine using MQTT to connect to a broker in the cloud. There is an important message behind this cool demo – security and reliability of embedded soft...