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A4964 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A4964 Datasheet(HTML) 1 Page - Allegro MicroSystems |
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1 / 92 page  The A4964 is a three-phase, sensorless, brushless DC (BLDC) motor controller for use with external N-channel power MOSFETs and is specifically designed for automotive applications. 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 watchdogforthemicrocontrollerandthehigh-voltageinterfaces between the microcontroller and the central ECU and ignition switch. The A4964 can also operate as an independent single- chip remote motor controller. The motor is driven using 3-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 A4964 to operate over a wide range of motor and load combinations. TheA4964canoperatewithdutycycle(voltage)control,current (torque limit) control, and closed-loop speed control. Control mode,operatingmode,andcontrolparametersareprogrammed through an SPI-compatible serial interface. Asingle current sense amplifier provides peak current limiting and average current measurement through the serial interface. Integrated diagnostics provide indication of undervoltage, overtemperature, and power bridge faults and can protect the power switches under most short-circuit conditions. The A4964 is provided in a 36-terminal QFN and a 32-lead QFP, both with exposed thermal pad. A4964-DS, Rev. 3 MCO-0000214 • Three-phase sensorless BLDC motor control FET driver • Three-phase sinusoidal drive with soft start • Sensorless start-up and commutation • Windmill detection and synchronization • Bootstrap gate drive for N-channel MOSFET bridge • 5.5 to 50 V supply range • SPI-compatible interface • Programmable control modes: speed, voltage, current • Peak current limiting • Control via SPI or PWM • Programmable gate drive for slew rate control • LIN / PWM physical interface with wake • Logic supply regulator with current limit • MCU watchdog and reset • Ignition switch interface • Diagnostics, status, current, and speed feedback Sensorless Sinusoidal Drive BLDC Controller PACKAGES Figure 1: Typical Applications Not to scale A4964 FEATURES AND BENEFITS DESCRIPTION December 21, 2018 • Automotive fuel, oil, and urea pumps • Automotive fans and blowers APPLICATIONS SPI MCU A4964 3-Phase Motor VBAT IG LIN DIAG VLR LIN WDOG MRSTn A4964 3-Phase Motor VBAT IG PWM DIAG VLR 36-terminal eQFN (suffix EV) 32-lead eQFP (suffix JP) 2 - |
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