A3520 ALPHA-MICRO | Alldatasheet

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Technical content

The a3520 is a DC motor controller IC, providing a single chip solution for a wide range of tasks including power supply, motor control and high level system control. The IC's components enable parallel execution of system functions such as PWM input capture, current limit monitoring, bridge clock generation, etc., while reducing the IC's MCU's load and memory requirements. The 28 pin 4x4mm QFN package option is best suited for small board designs. MCU Features  Standard compatible MCU  Powerful single cycle instruction set (only RAM access and branches need two cycles)  25MHz MCU clock  12 prioritized interrupt levels  256Byte RAM  4kByte Pseudo-MTP program memory  Four 16bit timers with pre-scaler  Two 8 bit timers with pre-scaler  Hardware watchdog timer  On-chip debugging support  Fast RAM-based development support  Two wire programming and debugging interface IC Features  Operating VCC range from 5-18V  On-chip 25MHz ±1% oscillator  10bit AD Converter with 8-channel multiplexer  On-chip 3.3V/5mA regulator  On-chip programmable 0.7V to 2.7V/10mA regulator, suitable for driving passive hall elements  VCC monitor  On-chip temperature sensor  6 gate driver outputs with pull and dump resistors  PWM input capture unit to decode duty cycles of external signals  Open drain signal output, over current protected  Two wire interface  0-VCC high voltage PWM-output ready to drive inrush current protection transistors  Up to 10 pins usable as GPIO  Spread spectrum PWM support via software  Non-overlapping bridge clock generator with programmable dead- time  Programmable current limit  analog comparator with programmable hysteresis (Hall sensor, Phase voltage feedback)

example application schematics Only a few external components are needed to build a simple motor application: Fig.1 Simplified single phase application schematic Fig. 2 Simplified sensorless three phase application schematic Control algorithms for different types of motors single phase, three phase with and without sensors are implemented as MCU programs. All six high voltage outputs can be used to drive bridge transistors directly. The on chip bridge driving logic includes dead time and shout through protection for each bridge transistor pair. PD1H PD1L PD2H PD2L +12V power supply CIN VCC DACVIO VD VA VREF Hall Sensor VH HC1 HC2 GND +3.3V output PWMINPWM input TACHO output TACH GPIO2 GPIO1 ADC1 ADC2PCL PDA a3520 programming interface * external components needed to meet 2000V machine model ESD protection level GND PD2H PD2L ADC3 VCC 100nF 100nF 100nF 100nF 100nF 100nF PD1H PD1L PD2H PD2L +12V power supply VCC DACVIO VD VA VREF CIN HC1 HC2 GND +3.3V output PWMINPWM input TACHO output TACH GPIO2 GPIO1 ADC2 ADC3 PCL PDA a3520 * external components needed to meet 2000V machine model ESD protection level GND PD2H PD2L PD2H PD2L PD3H PD3L PD3H PD3L ADC1 V W U Common CommonU W V VHVCC 100nF 100nF 100nF 100nF 100nF